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nn/chapter5.ipynb
yukun-hh 3994bc43eb up to chapter 9.6
2026-04-01 23:21:14 +08:00

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{
"cells": [
{
"cell_type": "code",
"id": "initial_id",
"metadata": {
"collapsed": true,
"ExecuteTime": {
"end_time": "2026-03-29T09:05:27.116778011Z",
"start_time": "2026-03-29T09:05:25.689631294Z"
}
},
"source": [
"\n",
"import torch\n",
"import d2l\n",
"import numpy\n",
"import torch.nn as nn\n",
"import torch.nn.functional as F"
],
"outputs": [],
"execution_count": 1
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:27.211229222Z",
"start_time": "2026-03-29T09:05:27.119198350Z"
}
},
"cell_type": "code",
"source": [
"net = nn.Sequential(nn.Linear(20, 256), nn.ReLU(), nn.Linear(256, 10))\n",
"X = torch.rand(2, 20)\n",
"net(X)"
],
"id": "dcd5590e7795eec1",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[-0.0620, 0.3494, -0.2706, 0.0934, 0.1624, 0.0507, 0.0276, 0.1200,\n",
" 0.1418, 0.1422],\n",
" [-0.2129, 0.3243, -0.3727, -0.0147, 0.1620, -0.0534, 0.0918, 0.0569,\n",
" 0.0515, -0.0515]], grad_fn=<AddmmBackward0>)"
]
},
"execution_count": 2,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 2
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:28.023879514Z",
"start_time": "2026-03-29T09:05:27.503008526Z"
}
},
"cell_type": "code",
"source": [
"class MLP(nn.Module):\n",
" def __init__(self):\n",
" super().__init__()\n",
" self.hidden=nn.Linear(20,256)\n",
" self.out=nn.Linear(256,10)\n",
" def forward(self,X):\n",
" return self.out(F.relu(self.hidden(X)))\n"
],
"id": "4ae330604b643cb4",
"outputs": [],
"execution_count": 3
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:28.598152494Z",
"start_time": "2026-03-29T09:05:28.312949801Z"
}
},
"cell_type": "code",
"source": [
"net=MLP()\n",
"net(X)"
],
"id": "cca55c6c0c7da12f",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[-0.0426, -0.0041, 0.0686, 0.0151, -0.0754, 0.0269, 0.2757, 0.0227,\n",
" 0.2260, 0.0424],\n",
" [ 0.0319, 0.0394, 0.0179, 0.0704, -0.1369, -0.0294, 0.2276, 0.0702,\n",
" 0.1313, 0.2124]], grad_fn=<AddmmBackward0>)"
]
},
"execution_count": 4,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 4
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:28.833430055Z",
"start_time": "2026-03-29T09:05:28.633643058Z"
}
},
"cell_type": "code",
"source": [
"class FixedHiddenMLP(nn.Module):\n",
" def __init__(self):\n",
" super().__init__()\n",
" # 不计算梯度的随机权重参数。因此其在训练期间保持不变\n",
" self.rand_weight = torch.rand((20, 20), requires_grad=False)\n",
" self.linear = nn.Linear(20, 20)\n",
" def forward(self, X):\n",
" X = self.linear(X)\n",
" # 使用创建的常量参数以及relu和mm函数\n",
" X = F.relu(torch.mm(X, self.rand_weight) + 1)\n",
" # 复用全连接层。这相当于两个全连接层共享参数\n",
" X = self.linear(X)\n",
" # 控制流\n",
" while X.abs().sum() > 1:\n",
" X /= 2\n",
" return X.sum()"
],
"id": "4518d62611d5e749",
"outputs": [],
"execution_count": 5
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:28.918094363Z",
"start_time": "2026-03-29T09:05:28.865853300Z"
}
},
"cell_type": "code",
"source": [
"net = FixedHiddenMLP()\n",
"net(X)"
],
"id": "fae0187ece4ed5c6",
"outputs": [
{
"data": {
"text/plain": [
"tensor(-0.0847, grad_fn=<SumBackward0>)"
]
},
"execution_count": 6,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 6
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:29.031399095Z",
"start_time": "2026-03-29T09:05:28.937762813Z"
}
},
"cell_type": "code",
"source": [
"class NestMLP(nn.Module):\n",
" def __init__(self):\n",
" super().__init__()\n",
" self.net = nn.Sequential(nn.Linear(20, 64), nn.ReLU(),\n",
" nn.Linear(64, 32), nn.ReLU())\n",
" self.linear = nn.Linear(32, 16)\n",
" def forward(self, X):\n",
" return self.linear(self.net(X))\n",
" chimera = nn.Sequential(NestMLP(), nn.Linear(16, 20), FixedHiddenMLP())\n",
" chimera(X)"
],
"id": "407ef13a86453aae",
"outputs": [],
"execution_count": 7
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:29.115640738Z",
"start_time": "2026-03-29T09:05:29.033684765Z"
}
},
"cell_type": "code",
"source": [
"net = nn.Sequential(nn.Linear(4, 8), nn.ReLU(), nn.Linear(8, 1))\n",
"X = torch.rand(size=(2, 4))\n",
"net(X)"
],
"id": "9f3526f263c7a249",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[-0.5641],\n",
" [-0.5857]], grad_fn=<AddmmBackward0>)"
]
},
"execution_count": 8,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 8
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:29.228591089Z",
"start_time": "2026-03-29T09:05:29.144124890Z"
}
},
"cell_type": "code",
"source": "print(net[2].state_dict())",
"id": "8c73f8daa02ba28b",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"OrderedDict([('weight', tensor([[-0.3334, 0.0416, -0.3501, -0.1285, 0.0512, 0.2549, -0.2154, -0.2633]])), ('bias', tensor([-0.0772]))])\n"
]
}
],
"execution_count": 9
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:29.323152541Z",
"start_time": "2026-03-29T09:05:29.255547310Z"
}
},
"cell_type": "code",
"source": "net[2].state_dict()",
"id": "b6fee6b64fb96e3c",
"outputs": [
{
"data": {
"text/plain": [
"OrderedDict([('weight',\n",
" tensor([[-0.3334, 0.0416, -0.3501, -0.1285, 0.0512, 0.2549, -0.2154, -0.2633]])),\n",
" ('bias', tensor([-0.0772]))])"
]
},
"execution_count": 10,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 10
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:29.379782432Z",
"start_time": "2026-03-29T09:05:29.328071536Z"
}
},
"cell_type": "code",
"source": "print(type(net[2].bias))",
"id": "b38e8dc384e038c5",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"<class 'torch.nn.parameter.Parameter'>\n"
]
}
],
"execution_count": 11
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:29.451394790Z",
"start_time": "2026-03-29T09:05:29.397103231Z"
}
},
"cell_type": "code",
"source": [
"print(net[2].bias)\n",
"print(net[2].bias.data)\n"
],
"id": "73f12ca3669d9ede",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Parameter containing:\n",
"tensor([-0.0772], requires_grad=True)\n",
"tensor([-0.0772])\n"
]
}
],
"execution_count": 12
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:29.518076804Z",
"start_time": "2026-03-29T09:05:29.463897541Z"
}
},
"cell_type": "code",
"source": "net[2].weight.grad==None",
"id": "db0fe33018c16fac",
"outputs": [
{
"data": {
"text/plain": [
"True"
]
},
"execution_count": 13,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 13
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:29.588672960Z",
"start_time": "2026-03-29T09:05:29.534910431Z"
}
},
"cell_type": "code",
"source": [
"print(*[(name, param.shape) for name, param in net[0].named_parameters()])\n",
"print(*[(name, param.shape) for name, param in net.named_parameters()])"
],
"id": "75847a1c608ee5c7",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"('weight', torch.Size([8, 4])) ('bias', torch.Size([8]))\n",
"('0.weight', torch.Size([8, 4])) ('0.bias', torch.Size([8])) ('2.weight', torch.Size([1, 8])) ('2.bias', torch.Size([1]))\n"
]
}
],
"execution_count": 14
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:29.642447216Z",
"start_time": "2026-03-29T09:05:29.589891260Z"
}
},
"cell_type": "code",
"source": "net.state_dict()['2.bias'].data",
"id": "cc74913e8742da7d",
"outputs": [
{
"data": {
"text/plain": [
"tensor([-0.0772])"
]
},
"execution_count": 15,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 15
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:29.708774862Z",
"start_time": "2026-03-29T09:05:29.659219518Z"
}
},
"cell_type": "code",
"source": [
"def block1():\n",
" return nn.Sequential(nn.Linear(4, 8), nn.ReLU(), nn.Linear(8, 4),nn.ReLU())\n",
"def block2():\n",
" net = nn.Sequential()\n",
" for i in range(4):\n",
" net.add_module(f'block{i}', block1())\n",
" return net"
],
"id": "53c39c5e61fa7bf5",
"outputs": [],
"execution_count": 16
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:29.765983699Z",
"start_time": "2026-03-29T09:05:29.710778796Z"
}
},
"cell_type": "code",
"source": [
"rgnet = nn.Sequential(block2(),nn.Linear(4,1))\n",
"rgnet(X)"
],
"id": "d3ac7759b619aca",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[0.2190],\n",
" [0.2190]], grad_fn=<AddmmBackward0>)"
]
},
"execution_count": 17,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 17
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:30.160316585Z",
"start_time": "2026-03-29T09:05:29.826193253Z"
}
},
"cell_type": "code",
"source": "print(rgnet)",
"id": "8fc60f64b07781e6",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Sequential(\n",
" (0): Sequential(\n",
" (block0): Sequential(\n",
" (0): Linear(in_features=4, out_features=8, bias=True)\n",
" (1): ReLU()\n",
" (2): Linear(in_features=8, out_features=4, bias=True)\n",
" (3): ReLU()\n",
" )\n",
" (block1): Sequential(\n",
" (0): Linear(in_features=4, out_features=8, bias=True)\n",
" (1): ReLU()\n",
" (2): Linear(in_features=8, out_features=4, bias=True)\n",
" (3): ReLU()\n",
" )\n",
" (block2): Sequential(\n",
" (0): Linear(in_features=4, out_features=8, bias=True)\n",
" (1): ReLU()\n",
" (2): Linear(in_features=8, out_features=4, bias=True)\n",
" (3): ReLU()\n",
" )\n",
" (block3): Sequential(\n",
" (0): Linear(in_features=4, out_features=8, bias=True)\n",
" (1): ReLU()\n",
" (2): Linear(in_features=8, out_features=4, bias=True)\n",
" (3): ReLU()\n",
" )\n",
" )\n",
" (1): Linear(in_features=4, out_features=1, bias=True)\n",
")\n"
]
}
],
"execution_count": 18
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:30.301122409Z",
"start_time": "2026-03-29T09:05:30.198111011Z"
}
},
"cell_type": "code",
"source": "rgnet[0][1][0].bias.data",
"id": "e590aaafca787b50",
"outputs": [
{
"data": {
"text/plain": [
"tensor([-0.3955, 0.0030, -0.0100, 0.3198, -0.4639, -0.4023, -0.3653, 0.0766])"
]
},
"execution_count": 19,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 19
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:30.342375999Z",
"start_time": "2026-03-29T09:05:30.305643495Z"
}
},
"cell_type": "code",
"source": [
"def init_normal(m):\n",
" if type(m) == nn.Linear:\n",
" nn.init.normal_(m.weight, mean=0, std=0.01)\n",
" nn.init.zeros_(m.bias)\n",
"net.apply(init_normal)\n",
"net[0].weight.data[0], net[0].bias.data[0]"
],
"id": "925ca33221d0a87e",
"outputs": [
{
"data": {
"text/plain": [
"(tensor([-0.0059, -0.0004, -0.0091, 0.0014]), tensor(0.))"
]
},
"execution_count": 20,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 20
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:30.413353915Z",
"start_time": "2026-03-29T09:05:30.350001341Z"
}
},
"cell_type": "code",
"source": [
"def init_xavier(m):\n",
" if type(m) == nn.Linear:\n",
" nn.init.xavier_uniform_(m.weight)\n",
"def init_42(m):\n",
" if type(m) == nn.Linear:\n",
" nn.init.constant_(m.weight, 42)\n",
"\n",
"net[0].apply(init_xavier)\n",
"net[2].apply(init_42)\n",
"print(net[0].weight.data[0])\n",
"print(net[2].weight.data)"
],
"id": "81e2de84a8c4ef32",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"tensor([ 0.1297, -0.3070, -0.2955, 0.3630])\n",
"tensor([[42., 42., 42., 42., 42., 42., 42., 42.]])\n"
]
}
],
"execution_count": 21
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:30.481562932Z",
"start_time": "2026-03-29T09:05:30.431139492Z"
}
},
"cell_type": "code",
"source": [
"x = torch.arange(4)\n",
"torch.save(x, 'x-file')"
],
"id": "f05bb378bb60ab9e",
"outputs": [],
"execution_count": 22
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:30.535399376Z",
"start_time": "2026-03-29T09:05:30.483767993Z"
}
},
"cell_type": "code",
"source": [
"x2 = torch.load('x-file')\n",
"x2"
],
"id": "a74ecaaac0d826c6",
"outputs": [
{
"data": {
"text/plain": [
"tensor([0, 1, 2, 3])"
]
},
"execution_count": 23,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 23
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:30.599578181Z",
"start_time": "2026-03-29T09:05:30.548047255Z"
}
},
"cell_type": "code",
"source": [
"class MLP(nn.Module):\n",
" def __init__(self):\n",
" super().__init__()\n",
" self.hidden = nn.Linear(20, 256)\n",
" self.output = nn.Linear(256, 10)\n",
" def forward(self, x):\n",
" return self.output(F.relu(self.hidden(x)))\n",
"\n",
"net = MLP()\n",
"X = torch.randn(size=(2, 20))\n",
"Y = net(X)"
],
"id": "b42598f0c4a8e801",
"outputs": [],
"execution_count": 24
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:30.650496800Z",
"start_time": "2026-03-29T09:05:30.601298115Z"
}
},
"cell_type": "code",
"source": "torch.save(net.state_dict(), 'mlp.params')",
"id": "aaa22eef549caa6f",
"outputs": [],
"execution_count": 25
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:30.706861993Z",
"start_time": "2026-03-29T09:05:30.652573915Z"
}
},
"cell_type": "code",
"source": [
"clone = MLP()\n",
"clone.load_state_dict(torch.load('mlp.params'))\n",
"clone.eval()"
],
"id": "b92f920229abeeae",
"outputs": [
{
"data": {
"text/plain": [
"MLP(\n",
" (hidden): Linear(in_features=20, out_features=256, bias=True)\n",
" (output): Linear(in_features=256, out_features=10, bias=True)\n",
")"
]
},
"execution_count": 26,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 26
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:30.786547453Z",
"start_time": "2026-03-29T09:05:30.723425498Z"
}
},
"cell_type": "code",
"source": [
"Y_clone = clone(X)\n",
"Y_clone == Y"
],
"id": "646c9eb6d7cc81c2",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[True, True, True, True, True, True, True, True, True, True],\n",
" [True, True, True, True, True, True, True, True, True, True]])"
]
},
"execution_count": 27,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 27
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:30.901224528Z",
"start_time": "2026-03-29T09:05:30.851425725Z"
}
},
"cell_type": "code",
"source": [
"def corr2d(X,K):\n",
" h,w=K.shape\n",
" Y=torch.ones((X.shape[0]-h+1,X.shape[1]-w+1))\n",
" for i in range(Y.shape[0]):\n",
" for j in range(Y.shape[1]):\n",
" Y[i,j]=(X[i:i+h,j:j+w]*K).sum()\n",
" return Y\n"
],
"id": "d45f9adfe47fce20",
"outputs": [],
"execution_count": 28
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:31.060500958Z",
"start_time": "2026-03-29T09:05:30.961112847Z"
}
},
"cell_type": "code",
"source": [
"X = torch.tensor([[0.0, 1.0, 2.0], [3.0, 4.0, 5.0], [6.0, 7.0, 8.0]])\n",
"K = torch.tensor([[0.0, 1.0], [2.0, 3.0]])\n",
"corr2d(X,K)"
],
"id": "db7279e13647c315",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[19., 25.],\n",
" [37., 43.]])"
]
},
"execution_count": 29,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 29
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:31.226121987Z",
"start_time": "2026-03-29T09:05:31.161589982Z"
}
},
"cell_type": "code",
"source": [
"class Conv2D(nn.Module):\n",
" def __init__(self, kernel_size):\n",
" super().__init__()\n",
" self.weight = nn.Parameter(torch.rand(kernel_size))\n",
" self.bias = nn.Parameter(torch.zeros(1))\n",
" def forward(self, x):\n",
" return corr2d(x, self.weight) + self.bias\n"
],
"id": "d60be1bd12a1f37e",
"outputs": [],
"execution_count": 30
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:31.353964548Z",
"start_time": "2026-03-29T09:05:31.284845417Z"
}
},
"cell_type": "code",
"source": [
"X = torch.ones((6, 8))\n",
"X[:, 2:6] = 0\n",
"X"
],
"id": "5083789b7a728442",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[1., 1., 0., 0., 0., 0., 1., 1.],\n",
" [1., 1., 0., 0., 0., 0., 1., 1.],\n",
" [1., 1., 0., 0., 0., 0., 1., 1.],\n",
" [1., 1., 0., 0., 0., 0., 1., 1.],\n",
" [1., 1., 0., 0., 0., 0., 1., 1.],\n",
" [1., 1., 0., 0., 0., 0., 1., 1.]])"
]
},
"execution_count": 31,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 31
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:31.497133186Z",
"start_time": "2026-03-29T09:05:31.413547301Z"
}
},
"cell_type": "code",
"source": [
"K = torch.tensor([[1.0, -1.0]])\n",
"Y = corr2d(X, K)\n",
"Y"
],
"id": "ee8d6bedbde886ad",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[ 0., 1., 0., 0., 0., -1., 0.],\n",
" [ 0., 1., 0., 0., 0., -1., 0.],\n",
" [ 0., 1., 0., 0., 0., -1., 0.],\n",
" [ 0., 1., 0., 0., 0., -1., 0.],\n",
" [ 0., 1., 0., 0., 0., -1., 0.],\n",
" [ 0., 1., 0., 0., 0., -1., 0.]])"
]
},
"execution_count": 32,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 32
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:31.722341828Z",
"start_time": "2026-03-29T09:05:31.614326731Z"
}
},
"cell_type": "code",
"source": "corr2d(X.t(), K)",
"id": "a8278c3837fa9a1c",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[0., 0., 0., 0., 0.],\n",
" [0., 0., 0., 0., 0.],\n",
" [0., 0., 0., 0., 0.],\n",
" [0., 0., 0., 0., 0.],\n",
" [0., 0., 0., 0., 0.],\n",
" [0., 0., 0., 0., 0.],\n",
" [0., 0., 0., 0., 0.],\n",
" [0., 0., 0., 0., 0.]])"
]
},
"execution_count": 33,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 33
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:31.872242267Z",
"start_time": "2026-03-29T09:05:31.806910138Z"
}
},
"cell_type": "code",
"source": "conv2d = nn.Conv2d(1,1, kernel_size=(1, 2), bias=False)",
"id": "ec61cdb61a8cabff",
"outputs": [],
"execution_count": 34
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:31.992426160Z",
"start_time": "2026-03-29T09:05:31.931105219Z"
}
},
"cell_type": "code",
"source": [
"X = X.reshape((1, 1, 6, 8))\n",
"Y = Y.reshape((1, 1, 6, 7))\n",
"lr = 3e-2"
],
"id": "d2fc19d84c79a10",
"outputs": [],
"execution_count": 35
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:32.264274507Z",
"start_time": "2026-03-29T09:05:31.995396351Z"
}
},
"cell_type": "code",
"source": [
"for i in range(100):\n",
" Y_hat = conv2d(X)\n",
" l = (Y_hat - Y) ** 2\n",
" conv2d.zero_grad()\n",
" l.sum().backward()\n",
" # 迭代卷积核\n",
" conv2d.weight.data[:] -= lr * conv2d.weight.grad\n",
" if (i + 1) % 20 == 0:\n",
" print(f'epoch {i+1}, loss {l.sum():.3f}')"
],
"id": "51fbb2e6398a9bd5",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"epoch 20, loss 0.000\n",
"epoch 40, loss 0.000\n",
"epoch 60, loss 0.000\n",
"epoch 80, loss 0.000\n",
"epoch 100, loss 0.000\n"
]
}
],
"execution_count": 36
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:32.346542597Z",
"start_time": "2026-03-29T09:05:32.281931301Z"
}
},
"cell_type": "code",
"source": "conv2d.weight.data.reshape((1, 2))\n",
"id": "bf53a423f429dfe4",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[ 1.0000, -1.0000]])"
]
},
"execution_count": 37,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 37
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:32.474945924Z",
"start_time": "2026-03-29T09:05:32.410988598Z"
}
},
"cell_type": "code",
"source": [
"\n",
"# 为了方便起见，我们定义了一个计算卷积层的函数。\n",
"# 此函数初始化卷积层权重，并对输入和输出提高和缩减相应的维数\n",
"def comp_conv2d(conv2d, X):\n",
"# 这里的（1，1）表示批量大小和通道数都是1\n",
" X = X.reshape((1, 1) + X.shape)\n",
" Y = conv2d(X)\n",
" # 省略前两个维度：批量大小和通道\n",
" return Y.reshape(Y.shape[2:])\n",
"# 请注意，这里每边都填充了1行或1列，因此总共添加了2行或2列\n",
"conv2d = nn.Conv2d(1, 1, kernel_size=3, padding=1)"
],
"id": "77b61d8c9a2363cc",
"outputs": [],
"execution_count": 38
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:32.610536979Z",
"start_time": "2026-03-29T09:05:32.537011140Z"
}
},
"cell_type": "code",
"source": [
"X = torch.rand(size=(8, 8))\n",
"comp_conv2d(conv2d, X).shape"
],
"id": "beda6ffa67ec2677",
"outputs": [
{
"data": {
"text/plain": [
"torch.Size([8, 8])"
]
},
"execution_count": 39,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 39
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:32.680637151Z",
"start_time": "2026-03-29T09:05:32.618558400Z"
}
},
"cell_type": "code",
"source": [
"conv2d = nn.Conv2d(1, 1, kernel_size=(5, 3), padding=(2, 1))\n",
"comp_conv2d(conv2d, X).shape"
],
"id": "8c51095daea1432d",
"outputs": [
{
"data": {
"text/plain": [
"torch.Size([8, 8])"
]
},
"execution_count": 40,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 40
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:32.771287457Z",
"start_time": "2026-03-29T09:05:32.697379946Z"
}
},
"cell_type": "code",
"source": [
"conv2d = nn.Conv2d(1, 1, kernel_size=3, padding=1, stride=2)\n",
"comp_conv2d(conv2d, X).shape"
],
"id": "581bf1b15162cbf6",
"outputs": [
{
"data": {
"text/plain": [
"torch.Size([4, 4])"
]
},
"execution_count": 41,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 41
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:32.831539044Z",
"start_time": "2026-03-29T09:05:32.773186750Z"
}
},
"cell_type": "code",
"source": [
"conv2d = nn.Conv2d(1, 1, kernel_size=(3, 5), padding=(0, 1), stride=(3, 4))\n",
"comp_conv2d(conv2d, X).shape"
],
"id": "6f7a2411247baff0",
"outputs": [
{
"data": {
"text/plain": [
"torch.Size([2, 2])"
]
},
"execution_count": 42,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 42
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:32.896336773Z",
"start_time": "2026-03-29T09:05:32.842010971Z"
}
},
"cell_type": "code",
"source": [
"def corr2d_multi_in(X,K):\n",
" return sum(corr2d(x,k) for x,k in zip(X,K))\n",
"X = torch.tensor([[[0.0, 1.0, 2.0], [3.0, 4.0, 5.0], [6.0, 7.0, 8.0]],\n",
"[[1.0, 2.0, 3.0], [4.0, 5.0, 6.0], [7.0, 8.0, 9.0]]])\n",
"K = torch.tensor([[[0.0, 1.0], [2.0, 3.0]], [[1.0, 2.0], [3.0, 4.0]]])\n",
"corr2d_multi_in(X, K)"
],
"id": "7ac0f17f97b2daa8",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[ 56., 72.],\n",
" [104., 120.]])"
]
},
"execution_count": 43,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 43
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:33.000406757Z",
"start_time": "2026-03-29T09:05:32.949274100Z"
}
},
"cell_type": "code",
"source": [
"def corr2d_multi_in_out(X,K) ->torch.Tensor :\n",
" return torch.stack([corr2d_multi_in(X,k) for k in K],0)\n"
],
"id": "d409110d0d6b4b49",
"outputs": [],
"execution_count": 44
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:33.125525859Z",
"start_time": "2026-03-29T09:05:33.060398301Z"
}
},
"cell_type": "code",
"source": [
"K = torch.stack((K, K + 1, K + 2), 0)\n",
"K.shape"
],
"id": "4114cd871a627075",
"outputs": [
{
"data": {
"text/plain": [
"torch.Size([3, 2, 2, 2])"
]
},
"execution_count": 45,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 45
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:33.198169422Z",
"start_time": "2026-03-29T09:05:33.131159996Z"
}
},
"cell_type": "code",
"source": "corr2d_multi_in_out(X, K)",
"id": "ce52f41dc9585f8c",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[[ 56., 72.],\n",
" [104., 120.]],\n",
"\n",
" [[ 76., 100.],\n",
" [148., 172.]],\n",
"\n",
" [[ 96., 128.],\n",
" [192., 224.]]])"
]
},
"execution_count": 46,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 46
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:33.249073Z",
"start_time": "2026-03-29T09:05:33.199594667Z"
}
},
"cell_type": "code",
"source": [
"def corr2d_multi_in_out_1x1(X, K):\n",
" h_i,h,w=X.shape\n",
" h_o=K.shape[0]\n",
" X=X.reshape((h_i,h*w))\n",
" print(X.shape)\n",
" K=K.reshape((h_o,h_i))\n",
" print(K.shape)\n",
" Y=torch.matmul(K,X)\n",
" return Y.reshape((h_o,h,w))"
],
"id": "362d8c692b3c1d75",
"outputs": [],
"execution_count": 47
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:33.298538943Z",
"start_time": "2026-03-29T09:05:33.250967377Z"
}
},
"cell_type": "code",
"source": [
"X = torch.normal(0, 1, (3, 3, 3))\n",
"K = torch.normal(0, 1, (2, 3, 1, 1))"
],
"id": "28e761f677df8b16",
"outputs": [],
"execution_count": 48
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:33.354138870Z",
"start_time": "2026-03-29T09:05:33.300557739Z"
}
},
"cell_type": "code",
"source": "Y1 = corr2d_multi_in_out_1x1(X, K)",
"id": "8eb276fed751a6b9",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"torch.Size([3, 9])\n",
"torch.Size([2, 3])\n"
]
}
],
"execution_count": 49
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:33.417520891Z",
"start_time": "2026-03-29T09:05:33.369461725Z"
}
},
"cell_type": "code",
"source": [
"Y2 = corr2d_multi_in_out(X, K)\n",
"assert float(torch.abs(Y1 - Y2).sum()) < 1e-6"
],
"id": "be28e27d30f36e2c",
"outputs": [],
"execution_count": 50
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:33.468327774Z",
"start_time": "2026-03-29T09:05:33.419539671Z"
}
},
"cell_type": "code",
"source": [
"def pool2d(X,pool_size,mode='max'):\n",
" p_h,p_w =pool_size\n",
" Y = torch.zeros((X.shape[0]-p_h+1,X.shape[1]-p_w+1))\n",
" for i in range(Y.shape[0]):\n",
" for j in range(Y.shape[1]):\n",
" match mode:\n",
" case 'max':\n",
" Y[i,j]=X[i:i+p_h,j:j+p_w].max()\n",
" case 'avg':\n",
" Y[i,j]=X[i:i+p_h,j:j+p_w].mean()\n",
"\n",
" return Y"
],
"id": "3c3f71349a2e54c0",
"outputs": [],
"execution_count": 51
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:33.526566195Z",
"start_time": "2026-03-29T09:05:33.470337819Z"
}
},
"cell_type": "code",
"source": [
"X = torch.tensor([[0.0, 1.0, 2.0], [3.0, 4.0, 5.0], [6.0, 7.0, 8.0]])\n",
"pool2d(X, (2, 2))"
],
"id": "a67207c861cf0cfd",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[4., 5.],\n",
" [7., 8.]])"
]
},
"execution_count": 52,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 52
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:33.680166201Z",
"start_time": "2026-03-29T09:05:33.578598740Z"
}
},
"cell_type": "code",
"source": "pool2d(X, (2, 2), 'avg')",
"id": "e387b48df3831b85",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[2., 3.],\n",
" [5., 6.]])"
]
},
"execution_count": 53,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 53
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:33.855460170Z",
"start_time": "2026-03-29T09:05:33.765585069Z"
}
},
"cell_type": "code",
"source": [
"X = torch.arange(16, dtype=torch.float32).reshape((1, 1, 4, 4))\n",
"X"
],
"id": "41b618b3a48522b4",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[[[ 0., 1., 2., 3.],\n",
" [ 4., 5., 6., 7.],\n",
" [ 8., 9., 10., 11.],\n",
" [12., 13., 14., 15.]]]])"
]
},
"execution_count": 54,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 54
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:34.023104664Z",
"start_time": "2026-03-29T09:05:33.949683264Z"
}
},
"cell_type": "code",
"source": [
"pool2d=nn.MaxPool2d(3)\n",
"pool2d(X)"
],
"id": "c77484a8d1267259",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[[[10.]]]])"
]
},
"execution_count": 55,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 55
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:34.093370019Z",
"start_time": "2026-03-29T09:05:34.026511981Z"
}
},
"cell_type": "code",
"source": [
"pool2d = nn.MaxPool2d(3, padding=1, stride=2)\n",
"pool2d(X)"
],
"id": "847a2bacfb6f2bd7",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[[[ 5., 7.],\n",
" [13., 15.]]]])"
]
},
"execution_count": 56,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 56
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:34.146680689Z",
"start_time": "2026-03-29T09:05:34.094779518Z"
}
},
"cell_type": "code",
"source": [
"pool2d = nn.MaxPool2d((2, 3), stride=(2, 3), padding=(0, 1))\n",
"pool2d(X)"
],
"id": "5efad1e0b616fff7",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[[[ 5., 7.],\n",
" [13., 15.]]]])"
]
},
"execution_count": 57,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 57
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:34.239200323Z",
"start_time": "2026-03-29T09:05:34.159117900Z"
}
},
"cell_type": "code",
"source": [
"X = torch.cat((X, X + 1), 1)\n",
"X"
],
"id": "386d4b3eb8069328",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[[[ 0., 1., 2., 3.],\n",
" [ 4., 5., 6., 7.],\n",
" [ 8., 9., 10., 11.],\n",
" [12., 13., 14., 15.]],\n",
"\n",
" [[ 1., 2., 3., 4.],\n",
" [ 5., 6., 7., 8.],\n",
" [ 9., 10., 11., 12.],\n",
" [13., 14., 15., 16.]]]])"
]
},
"execution_count": 58,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 58
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:34.331040051Z",
"start_time": "2026-03-29T09:05:34.248225619Z"
}
},
"cell_type": "code",
"source": [
"pool2d = nn.MaxPool2d(3, padding=1, stride=2)\n",
"pool2d(X)"
],
"id": "ba5f57a8ca2a3b06",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[[[ 5., 7.],\n",
" [13., 15.]],\n",
"\n",
" [[ 6., 8.],\n",
" [14., 16.]]]])"
]
},
"execution_count": 59,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 59
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:34.425299189Z",
"start_time": "2026-03-29T09:05:34.352449123Z"
}
},
"cell_type": "code",
"source": [
"net = nn.Sequential(\n",
" nn.Conv2d(1,6,kernel_size=5,padding=2), #1*1*28*28 -> 1*6*28*28\n",
" nn.Sigmoid(),\n",
" nn.AvgPool2d(kernel_size=2, stride=2), #1*6*28*28 -> 1*6*14*14\n",
" nn.Conv2d(6, 16, kernel_size=5), nn.Sigmoid(), #1*6*14*14 -> 1*16*10*10\n",
" nn.AvgPool2d(kernel_size=2, stride=2), #1*16*10*10 -> 1*16*5*5\n",
" nn.Flatten(),\n",
" nn.Linear(16 * 5 * 5, 120), nn.Sigmoid(),\n",
" nn.Linear(120, 84), nn.Sigmoid(),\n",
" nn.Linear(84, 10)\n",
")\n",
"X = torch.rand(size=(1,1,28,28),dtype=torch.float32)\n",
"for layer in net:\n",
" X=layer(X)\n",
" print(layer.__class__.__name__,'output shape: \\t',X.shape)"
],
"id": "1eabc29f9c838842",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Conv2d output shape: \t torch.Size([1, 6, 28, 28])\n",
"Sigmoid output shape: \t torch.Size([1, 6, 28, 28])\n",
"AvgPool2d output shape: \t torch.Size([1, 6, 14, 14])\n",
"Conv2d output shape: \t torch.Size([1, 16, 10, 10])\n",
"Sigmoid output shape: \t torch.Size([1, 16, 10, 10])\n",
"AvgPool2d output shape: \t torch.Size([1, 16, 5, 5])\n",
"Flatten output shape: \t torch.Size([1, 400])\n",
"Linear output shape: \t torch.Size([1, 120])\n",
"Sigmoid output shape: \t torch.Size([1, 120])\n",
"Linear output shape: \t torch.Size([1, 84])\n",
"Sigmoid output shape: \t torch.Size([1, 84])\n",
"Linear output shape: \t torch.Size([1, 10])\n"
]
}
],
"execution_count": 60
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:35.484128366Z",
"start_time": "2026-03-29T09:05:34.438360644Z"
}
},
"cell_type": "code",
"source": [
"import d2l.torch as d2l\n",
"batch_size = 256\n",
"train_iter, test_iter = d2l.load_data_fashion_mnist(batch_size=batch_size)"
],
"id": "e372f75817ad4a0f",
"outputs": [],
"execution_count": 61
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:35.582060752Z",
"start_time": "2026-03-29T09:05:35.533014324Z"
}
},
"cell_type": "code",
"source": [
"lr, num_epochs = 0.9, 10\n",
"#d2l.train_ch6(net, train_iter, test_iter, num_epochs, lr, d2l.try_gpu())"
],
"id": "9aaeb948f3353955",
"outputs": [],
"execution_count": 62
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:35.632954849Z",
"start_time": "2026-03-29T09:05:35.583695074Z"
}
},
"cell_type": "code",
"source": [
"class Inception(nn.Module):\n",
" def __init__(self,in_channels,c1,c2,c3,c4,**kwargs):\n",
" super(Inception,self).__init__(**kwargs)\n",
" self.p1_1 = nn.Conv2d(in_channels,c1,kernel_size=1)\n",
" self.p2_1 = nn.Conv2d(in_channels,c2[0],kernel_size=1)\n",
" self.p2_2 = nn.Conv2d(c2[0],c2[1],kernel_size=3,padding=1)\n",
" self.p3_1 = nn.Conv2d(in_channels,c3[0],kernel_size=1)\n",
" self.p3_2 = nn.Conv2d(c3[0],c3[1],kernel_size=5,padding=2)\n",
" self.p4_1 = nn.MaxPool2d(kernel_size=3, stride=1, padding=1)\n",
" self.p4_2 = nn.Conv2d(in_channels, c4, kernel_size=1)\n",
" def forward(self,x):\n",
" p1 = F.relu(self.p1_1(x))\n",
" p2 = F.relu(self.p2_2(F.relu(self.p2_1(x))))\n",
" p3 = F.relu(self.p3_2(F.relu(self.p3_1(x))))\n",
" p4 = F.relu(self.p4_2(self.p4_1(x)))\n",
" return torch.cat((p1,p2,p3,p4),dim=1)"
],
"id": "6d3bb3f70f297dba",
"outputs": [],
"execution_count": 63
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:35.690181474Z",
"start_time": "2026-03-29T09:05:35.634277862Z"
}
},
"cell_type": "code",
"source": [
"b1 = nn.Sequential(nn.Conv2d(1, 64, kernel_size=7, stride=2, padding=3),\n",
" nn.ReLU(),\n",
" nn.MaxPool2d(kernel_size=3, stride=2, padding=1))\n",
"b2 = nn.Sequential(nn.Conv2d(64, 64, kernel_size=1),\n",
" nn.ReLU(),\n",
" nn.Conv2d(64, 192, kernel_size=3, padding=1),\n",
" nn.ReLU(),\n",
" nn.MaxPool2d(kernel_size=3, stride=2, padding=1))\n",
"b3 = nn.Sequential(Inception(192, 64, (96, 128), (16, 32), 32),\n",
" Inception(256, 128, (128, 192), (32, 96), 64),\n",
" nn.MaxPool2d(kernel_size=3, stride=2, padding=1))\n",
"b4 = nn.Sequential(Inception(480, 192, (96, 208), (16, 48), 64),\n",
" Inception(512, 160, (112, 224), (24, 64), 64),\n",
" Inception(512, 128, (128, 256), (24, 64), 64),\n",
" Inception(512, 112, (144, 288), (32, 64), 64),\n",
" Inception(528, 256, (160, 320), (32, 128), 128),\n",
" nn.MaxPool2d(kernel_size=3, stride=2, padding=1))\n",
"b5 = nn.Sequential(Inception(832, 256, (160, 320), (32, 128), 128),\n",
" Inception(832, 384, (192, 384), (48, 128), 128),\n",
" nn.AdaptiveAvgPool2d((1,1)),\n",
" nn.Flatten())\n",
"net = nn.Sequential(b1, b2, b3, b4, b5, nn.Linear(1024, 10))\n",
"X = torch.rand(size=(1, 1, 96, 96))\n",
"for layer in net:\n",
" X = layer(X)\n",
" print(layer.__class__.__name__,'output shape:\\t', X.shape)"
],
"id": "6ef7022bcb288d65",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Sequential output shape:\t torch.Size([1, 64, 24, 24])\n",
"Sequential output shape:\t torch.Size([1, 192, 12, 12])\n",
"Sequential output shape:\t torch.Size([1, 480, 6, 6])\n",
"Sequential output shape:\t torch.Size([1, 832, 3, 3])\n",
"Sequential output shape:\t torch.Size([1, 1024])\n",
"Linear output shape:\t torch.Size([1, 10])\n"
]
}
],
"execution_count": 64
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:36.618596478Z",
"start_time": "2026-03-29T09:05:35.704418296Z"
}
},
"cell_type": "code",
"source": [
"import torchinfo\n",
"torchinfo.summary(net,(1,1,96,96))"
],
"id": "acc019ce7afa4470",
"outputs": [
{
"data": {
"text/plain": [
"==========================================================================================\n",
"Layer (type:depth-idx) Output Shape Param #\n",
"==========================================================================================\n",
"Sequential [1, 10] --\n",
"├─Sequential: 1-1 [1, 64, 24, 24] --\n",
"│ └─Conv2d: 2-1 [1, 64, 48, 48] 3,200\n",
"│ └─ReLU: 2-2 [1, 64, 48, 48] --\n",
"│ └─MaxPool2d: 2-3 [1, 64, 24, 24] --\n",
"├─Sequential: 1-2 [1, 192, 12, 12] --\n",
"│ └─Conv2d: 2-4 [1, 64, 24, 24] 4,160\n",
"│ └─ReLU: 2-5 [1, 64, 24, 24] --\n",
"│ └─Conv2d: 2-6 [1, 192, 24, 24] 110,784\n",
"│ └─ReLU: 2-7 [1, 192, 24, 24] --\n",
"│ └─MaxPool2d: 2-8 [1, 192, 12, 12] --\n",
"├─Sequential: 1-3 [1, 480, 6, 6] --\n",
"│ └─Inception: 2-9 [1, 256, 12, 12] --\n",
"│ │ └─Conv2d: 3-1 [1, 64, 12, 12] 12,352\n",
"│ │ └─Conv2d: 3-2 [1, 96, 12, 12] 18,528\n",
"│ │ └─Conv2d: 3-3 [1, 128, 12, 12] 110,720\n",
"│ │ └─Conv2d: 3-4 [1, 16, 12, 12] 3,088\n",
"│ │ └─Conv2d: 3-5 [1, 32, 12, 12] 12,832\n",
"│ │ └─MaxPool2d: 3-6 [1, 192, 12, 12] --\n",
"│ │ └─Conv2d: 3-7 [1, 32, 12, 12] 6,176\n",
"│ └─Inception: 2-10 [1, 480, 12, 12] --\n",
"│ │ └─Conv2d: 3-8 [1, 128, 12, 12] 32,896\n",
"│ │ └─Conv2d: 3-9 [1, 128, 12, 12] 32,896\n",
"│ │ └─Conv2d: 3-10 [1, 192, 12, 12] 221,376\n",
"│ │ └─Conv2d: 3-11 [1, 32, 12, 12] 8,224\n",
"│ │ └─Conv2d: 3-12 [1, 96, 12, 12] 76,896\n",
"│ │ └─MaxPool2d: 3-13 [1, 256, 12, 12] --\n",
"│ │ └─Conv2d: 3-14 [1, 64, 12, 12] 16,448\n",
"│ └─MaxPool2d: 2-11 [1, 480, 6, 6] --\n",
"├─Sequential: 1-4 [1, 832, 3, 3] --\n",
"│ └─Inception: 2-12 [1, 512, 6, 6] --\n",
"│ │ └─Conv2d: 3-15 [1, 192, 6, 6] 92,352\n",
"│ │ └─Conv2d: 3-16 [1, 96, 6, 6] 46,176\n",
"│ │ └─Conv2d: 3-17 [1, 208, 6, 6] 179,920\n",
"│ │ └─Conv2d: 3-18 [1, 16, 6, 6] 7,696\n",
"│ │ └─Conv2d: 3-19 [1, 48, 6, 6] 19,248\n",
"│ │ └─MaxPool2d: 3-20 [1, 480, 6, 6] --\n",
"│ │ └─Conv2d: 3-21 [1, 64, 6, 6] 30,784\n",
"│ └─Inception: 2-13 [1, 512, 6, 6] --\n",
"│ │ └─Conv2d: 3-22 [1, 160, 6, 6] 82,080\n",
"│ │ └─Conv2d: 3-23 [1, 112, 6, 6] 57,456\n",
"│ │ └─Conv2d: 3-24 [1, 224, 6, 6] 226,016\n",
"│ │ └─Conv2d: 3-25 [1, 24, 6, 6] 12,312\n",
"│ │ └─Conv2d: 3-26 [1, 64, 6, 6] 38,464\n",
"│ │ └─MaxPool2d: 3-27 [1, 512, 6, 6] --\n",
"│ │ └─Conv2d: 3-28 [1, 64, 6, 6] 32,832\n",
"│ └─Inception: 2-14 [1, 512, 6, 6] --\n",
"│ │ └─Conv2d: 3-29 [1, 128, 6, 6] 65,664\n",
"│ │ └─Conv2d: 3-30 [1, 128, 6, 6] 65,664\n",
"│ │ └─Conv2d: 3-31 [1, 256, 6, 6] 295,168\n",
"│ │ └─Conv2d: 3-32 [1, 24, 6, 6] 12,312\n",
"│ │ └─Conv2d: 3-33 [1, 64, 6, 6] 38,464\n",
"│ │ └─MaxPool2d: 3-34 [1, 512, 6, 6] --\n",
"│ │ └─Conv2d: 3-35 [1, 64, 6, 6] 32,832\n",
"│ └─Inception: 2-15 [1, 528, 6, 6] --\n",
"│ │ └─Conv2d: 3-36 [1, 112, 6, 6] 57,456\n",
"│ │ └─Conv2d: 3-37 [1, 144, 6, 6] 73,872\n",
"│ │ └─Conv2d: 3-38 [1, 288, 6, 6] 373,536\n",
"│ │ └─Conv2d: 3-39 [1, 32, 6, 6] 16,416\n",
"│ │ └─Conv2d: 3-40 [1, 64, 6, 6] 51,264\n",
"│ │ └─MaxPool2d: 3-41 [1, 512, 6, 6] --\n",
"│ │ └─Conv2d: 3-42 [1, 64, 6, 6] 32,832\n",
"│ └─Inception: 2-16 [1, 832, 6, 6] --\n",
"│ │ └─Conv2d: 3-43 [1, 256, 6, 6] 135,424\n",
"│ │ └─Conv2d: 3-44 [1, 160, 6, 6] 84,640\n",
"│ │ └─Conv2d: 3-45 [1, 320, 6, 6] 461,120\n",
"│ │ └─Conv2d: 3-46 [1, 32, 6, 6] 16,928\n",
"│ │ └─Conv2d: 3-47 [1, 128, 6, 6] 102,528\n",
"│ │ └─MaxPool2d: 3-48 [1, 528, 6, 6] --\n",
"│ │ └─Conv2d: 3-49 [1, 128, 6, 6] 67,712\n",
"│ └─MaxPool2d: 2-17 [1, 832, 3, 3] --\n",
"├─Sequential: 1-5 [1, 1024] --\n",
"│ └─Inception: 2-18 [1, 832, 3, 3] --\n",
"│ │ └─Conv2d: 3-50 [1, 256, 3, 3] 213,248\n",
"│ │ └─Conv2d: 3-51 [1, 160, 3, 3] 133,280\n",
"│ │ └─Conv2d: 3-52 [1, 320, 3, 3] 461,120\n",
"│ │ └─Conv2d: 3-53 [1, 32, 3, 3] 26,656\n",
"│ │ └─Conv2d: 3-54 [1, 128, 3, 3] 102,528\n",
"│ │ └─MaxPool2d: 3-55 [1, 832, 3, 3] --\n",
"│ │ └─Conv2d: 3-56 [1, 128, 3, 3] 106,624\n",
"│ └─Inception: 2-19 [1, 1024, 3, 3] --\n",
"│ │ └─Conv2d: 3-57 [1, 384, 3, 3] 319,872\n",
"│ │ └─Conv2d: 3-58 [1, 192, 3, 3] 159,936\n",
"│ │ └─Conv2d: 3-59 [1, 384, 3, 3] 663,936\n",
"│ │ └─Conv2d: 3-60 [1, 48, 3, 3] 39,984\n",
"│ │ └─Conv2d: 3-61 [1, 128, 3, 3] 153,728\n",
"│ │ └─MaxPool2d: 3-62 [1, 832, 3, 3] --\n",
"│ │ └─Conv2d: 3-63 [1, 128, 3, 3] 106,624\n",
"│ └─AdaptiveAvgPool2d: 2-20 [1, 1024, 1, 1] --\n",
"│ └─Flatten: 2-21 [1, 1024] --\n",
"├─Linear: 1-6 [1, 10] 10,250\n",
"==========================================================================================\n",
"Total params: 5,977,530\n",
"Trainable params: 5,977,530\n",
"Non-trainable params: 0\n",
"Total mult-adds (Units.MEGABYTES): 276.66\n",
"==========================================================================================\n",
"Input size (MB): 0.04\n",
"Forward/backward pass size (MB): 4.74\n",
"Params size (MB): 23.91\n",
"Estimated Total Size (MB): 28.69\n",
"=========================================================================================="
]
},
"execution_count": 65,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 65
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:36.729050116Z",
"start_time": "2026-03-29T09:05:36.672212588Z"
}
},
"cell_type": "code",
"source": [
"lr, num_epochs, batch_size = 0.1, 10, 128\n",
"train_iter, test_iter = d2l.load_data_fashion_mnist(batch_size, resize=96)\n",
"#d2l.train_ch6(net, train_iter, test_iter, num_epochs, lr, d2l.try_gpu())"
],
"id": "3760a5e5813405f7",
"outputs": [],
"execution_count": 66
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:36.793463633Z",
"start_time": "2026-03-29T09:05:36.742329034Z"
}
},
"cell_type": "code",
"source": [
"class Residual(nn.Module):\n",
" def __init__(self,input_channels,num_channels,use_1x1conv=False,strides=1):\n",
" super().__init__()\n",
" self.conv1 = nn.Conv2d(input_channels,num_channels,kernel_size=3,padding=1,stride=strides)\n",
" self.conv2 = nn.Conv2d(num_channels,num_channels,kernel_size=3,padding=1)\n",
" if use_1x1conv:\n",
" self.conv3 = nn.Conv2d(input_channels,num_channels,kernel_size=1,stride=strides)\n",
" else:\n",
" self.conv3= None\n",
" self.bn1=nn.BatchNorm2d(num_channels)\n",
" self.bn2=nn.BatchNorm2d(num_channels)\n",
" def forward(self,X):\n",
" Y=F.relu(self.bn1(self.conv1(X)))\n",
" Y=self.bn2(self.conv2(Y))\n",
" if self.conv3:\n",
" X = self.conv3(X)\n",
" Y+=X\n",
" return F.relu(Y)\n"
],
"id": "9300979845ba6916",
"outputs": [],
"execution_count": 67
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:36.854913593Z",
"start_time": "2026-03-29T09:05:36.806531736Z"
}
},
"cell_type": "code",
"source": [
"blk = Residual(3,3)\n",
"X = torch.rand(4, 3, 6, 6)"
],
"id": "1248323517ff3228",
"outputs": [],
"execution_count": 68
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:36.923726941Z",
"start_time": "2026-03-29T09:05:36.856121115Z"
}
},
"cell_type": "code",
"source": [
"blk = Residual(3,6, use_1x1conv=True, strides=2)\n",
"blk(X).shape"
],
"id": "82cdbd71a157b51c",
"outputs": [
{
"data": {
"text/plain": [
"torch.Size([4, 6, 3, 3])"
]
},
"execution_count": 69,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 69
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:36.973017126Z",
"start_time": "2026-03-29T09:05:36.924981665Z"
}
},
"cell_type": "code",
"source": [
"b1 = nn.Sequential(nn.Conv2d(1, 64, kernel_size=7, stride=2, padding=3),\n",
"nn.BatchNorm2d(64), nn.ReLU(),\n",
"nn.MaxPool2d(kernel_size=3, stride=2, padding=1))"
],
"id": "727da1d2d363ac62",
"outputs": [],
"execution_count": 70
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:37.023199935Z",
"start_time": "2026-03-29T09:05:36.974467726Z"
}
},
"cell_type": "code",
"source": [
"def resnet_block(input_channels, num_channels, num_residuals,\n",
" first_block=False):\n",
" blk = []\n",
" for i in range(num_residuals):\n",
" if i == 0 and not first_block:\n",
" blk.append(Residual(input_channels, num_channels,\n",
" use_1x1conv=True, strides=2))\n",
" else:\n",
" blk.append(Residual(num_channels, num_channels))\n",
" return blk"
],
"id": "124134971f8441c0",
"outputs": [],
"execution_count": 71
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:37.072041927Z",
"start_time": "2026-03-29T09:05:37.024683317Z"
}
},
"cell_type": "code",
"source": [
"b2 = nn.Sequential(*resnet_block(64, 64, 2, first_block=True))\n",
"b3 = nn.Sequential(*resnet_block(64, 128, 2))\n",
"b4 = nn.Sequential(*resnet_block(128, 256, 2))\n",
"b5 = nn.Sequential(*resnet_block(256, 512, 2))"
],
"id": "ca1f1c69fba3e913",
"outputs": [],
"execution_count": 72
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:37.121767680Z",
"start_time": "2026-03-29T09:05:37.073541025Z"
}
},
"cell_type": "code",
"source": [
"net = nn.Sequential(b1, b2, b3, b4, b5,\n",
"nn.AdaptiveAvgPool2d((1,1)),\n",
"nn.Flatten(), nn.Linear(512, 10))"
],
"id": "f21db27de5dbdec1",
"outputs": [],
"execution_count": 73
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:37.202821371Z",
"start_time": "2026-03-29T09:05:37.123064637Z"
}
},
"cell_type": "code",
"source": [
"X = torch.rand(size=(1, 1, 224, 224))\n",
"for layer in net:\n",
" X = layer(X)\n",
" print(layer.__class__.__name__,'output shape:\\t', X.shape)"
],
"id": "6f8851a2bfd18c4e",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Sequential output shape:\t torch.Size([1, 64, 56, 56])\n",
"Sequential output shape:\t torch.Size([1, 64, 56, 56])\n",
"Sequential output shape:\t torch.Size([1, 128, 28, 28])\n",
"Sequential output shape:\t torch.Size([1, 256, 14, 14])\n",
"Sequential output shape:\t torch.Size([1, 512, 7, 7])\n",
"AdaptiveAvgPool2d output shape:\t torch.Size([1, 512, 1, 1])\n",
"Flatten output shape:\t torch.Size([1, 512])\n",
"Linear output shape:\t torch.Size([1, 10])\n"
]
}
],
"execution_count": 74
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:37.251179948Z",
"start_time": "2026-03-29T09:05:37.204125947Z"
}
},
"cell_type": "code",
"source": [
"lr, num_epochs, batch_size = 0.05, 10, 256\n",
"train_iter, test_iter = d2l.load_data_fashion_mnist(batch_size, resize=96)\n",
"#d2l.train_ch6(net, train_iter, test_iter, num_epochs, lr, d2l.try_gpu())"
],
"id": "e095d74b29dffef6",
"outputs": [],
"execution_count": 75
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:37.324948458Z",
"start_time": "2026-03-29T09:05:37.256990577Z"
}
},
"cell_type": "code",
"source": [
"import torch\n",
"import d2l.torch as d2l\n",
"import numpy\n",
"import torch.nn as nn\n",
"import torch.nn.functional as F\n",
"print(torch.version.__version__)"
],
"id": "3fd6d22221f87bea",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"2.10.0+cu128\n"
]
}
],
"execution_count": 76
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:37.375981476Z",
"start_time": "2026-03-29T09:05:37.328240979Z"
}
},
"cell_type": "code",
"source": [
"A=torch.Tensor([[1,2,0,0],[0,2,0,0],[0,0,2,1],[0,0,0,3]])\n",
"C=torch.Tensor([[1,0,0,0],[0,1,0,0],[0,0,-2,3],[0,0,0,-3]])"
],
"id": "254f5d3d659dbe0f",
"outputs": [],
"execution_count": 77
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:37.425553458Z",
"start_time": "2026-03-29T09:05:37.377516460Z"
}
},
"cell_type": "code",
"source": "B=torch.Tensor([[2,0,0,0],[-2,1,0,0],[0,0,-3,0],[0,0,0,-3]])",
"id": "a13d9c27c2fdbfad",
"outputs": [],
"execution_count": 78
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:37.480263855Z",
"start_time": "2026-03-29T09:05:37.427439519Z"
}
},
"cell_type": "code",
"source": "torch.mm(A,C)",
"id": "e513a37beaa85f8f",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[ 1., 2., 0., 0.],\n",
" [ 0., 2., 0., 0.],\n",
" [ 0., 0., -4., 3.],\n",
" [ 0., 0., 0., -9.]])"
]
},
"execution_count": 79,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 79
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:37.626602811Z",
"start_time": "2026-03-29T09:05:37.543653646Z"
}
},
"cell_type": "code",
"source": "torch.det(torch.mm(torch.mm(A,C),B))",
"id": "9a85eceac652875f",
"outputs": [
{
"data": {
"text/plain": [
"tensor(1296.)"
]
},
"execution_count": 80,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 80
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:37.767593515Z",
"start_time": "2026-03-29T09:05:37.692991032Z"
}
},
"cell_type": "code",
"source": "1296**5\n",
"id": "6dc27d79722da58f",
"outputs": [
{
"data": {
"text/plain": [
"3656158440062976"
]
},
"execution_count": 81,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 81
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:37.817415051Z",
"start_time": "2026-03-29T09:05:37.779730510Z"
}
},
"cell_type": "code",
"source": "torch.mm(C,B)",
"id": "ec5a170d775f4705",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[ 2., 0., 0., 0.],\n",
" [-2., 1., 0., 0.],\n",
" [ 0., 0., 6., -9.],\n",
" [ 0., 0., 0., 9.]])"
]
},
"execution_count": 82,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 82
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:38.035076815Z",
"start_time": "2026-03-29T09:05:37.870776022Z"
}
},
"cell_type": "code",
"source": [
"T = 1000 # 总共产生1000个点\n",
"time = torch.arange(1, T + 1, dtype=torch.float32)\n",
"x = torch.sin(0.01 * time) + torch.normal(0, 0.2, (T,))\n",
"d2l.plot(time, [x], 'time', 'x', xlim=[1, 1000], figsize=(6, 3))"
],
"id": "c3884b10464c6baa",
"outputs": [
{
"data": {
"text/plain": [
"<Figure size 600x300 with 1 Axes>"
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},
"metadata": {},
"output_type": "display_data",
"jetTransient": {
"display_id": null
}
}
],
"execution_count": 83
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:38.254208009Z",
"start_time": "2026-03-29T09:05:38.094754063Z"
}
},
"cell_type": "code",
"source": [
"tau = 4\n",
"features = torch.zeros((T - tau, tau))\n",
"for i in range(tau):\n",
" features[:, i] = x[i: T - tau + i]\n",
"labels = x[tau:].reshape((-1, 1))\n",
"x,features,labels\n"
],
"id": "5d450c6f6b724a14",
"outputs": [
{
"data": {
"text/plain": [
"(tensor([ 6.4438e-02, -2.8849e-02, 2.2463e-01, -1.7219e-01, 6.6353e-02,\n",
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]
},
"execution_count": 84,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 84
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:38.270738873Z",
"start_time": "2026-03-29T09:05:38.256891510Z"
}
},
"cell_type": "code",
"source": [
"batch_size, n_train = 16, 600\n",
"# 只有前n_train个样本用于训练\n",
"train_iter = d2l.load_array((features[:n_train], labels[:n_train]),\n",
"batch_size, is_train=True)\n"
],
"id": "239a596b20d40dec",
"outputs": [],
"execution_count": 85
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:38.324191264Z",
"start_time": "2026-03-29T09:05:38.275367502Z"
}
},
"cell_type": "code",
"source": [
"def init_weights(m):\n",
" if type(m) == nn.Linear:\n",
" nn.init.xavier_uniform_(m.weight)"
],
"id": "54d30bd0ee41cb8",
"outputs": [],
"execution_count": 86
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:38.371737960Z",
"start_time": "2026-03-29T09:05:38.325724185Z"
}
},
"cell_type": "code",
"source": [
"def get_net():\n",
" net = nn.Sequential(nn.Linear(4, 10),\n",
" nn.ReLU(),\n",
" nn.Linear(10, 1))\n",
" net.apply(init_weights)\n",
" return net\n",
"loss = nn.MSELoss(reduction='none')"
],
"id": "5d095792e3b3681",
"outputs": [],
"execution_count": 87
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:38.471484710Z",
"start_time": "2026-03-29T09:05:38.373039400Z"
}
},
"cell_type": "code",
"source": [
"def train(net, train_iter, loss, epochs, lr):\n",
" trainer = torch.optim.Adam(net.parameters(), lr)\n",
" for epoch in range(epochs):\n",
" for X, y in train_iter:\n",
" trainer.zero_grad()\n",
" l = loss(net(X), y)\n",
" l.sum().backward()\n",
" trainer.step()\n",
" print(f'epoch {epoch + 1}, '\n",
" f'loss: {d2l.evaluate_loss(net, train_iter, loss):f}')\n",
"net = get_net()\n",
"train(net, train_iter, loss, 5, 0.01)"
],
"id": "5c1dba484e805335",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"epoch 1, loss: 0.057278\n",
"epoch 2, loss: 0.051284\n",
"epoch 3, loss: 0.047806\n",
"epoch 4, loss: 0.048928\n",
"epoch 5, loss: 0.049009\n"
]
},
{
"name": "stderr",
"output_type": "stream",
"text": [
"/home/yukun/.conda/envs/nn/lib/python3.11/site-packages/d2l/torch.py:3179: UserWarning: Converting a tensor with requires_grad=True to a scalar may lead to unexpected behavior.\n",
"Consider using tensor.detach() first. (Triggered internally at /pytorch/torch/csrc/autograd/generated/python_variable_methods.cpp:836.)\n",
" self.data = [a + float(b) for a, b in zip(self.data, args)]\n"
]
}
],
"execution_count": 88
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:38.651527416Z",
"start_time": "2026-03-29T09:05:38.486176418Z"
}
},
"cell_type": "code",
"source": [
"onestep_preds = net(features)\n",
"d2l.plot([time, time[tau:]],\n",
"[x.detach().numpy(), onestep_preds.detach().numpy()], 'time',\n",
"'x', legend=['data', '1-step preds'], xlim=[1, 1000],\n",
"figsize=(6, 3))"
],
"id": "a6efb4a978cd9375",
"outputs": [
{
"data": {
"text/plain": [
"<Figure size 600x300 with 1 Axes>"
],
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},
"metadata": {},
"output_type": "display_data",
"jetTransient": {
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}
}
],
"execution_count": 89
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:38.758036538Z",
"start_time": "2026-03-29T09:05:38.654924198Z"
}
},
"cell_type": "code",
"source": [
"multistep_preds = torch.zeros(T)\n",
"multistep_preds[: n_train + tau] = x[: n_train + tau]\n",
"for i in range(n_train + tau, T):\n",
" multistep_preds[i] = net(\n",
" multistep_preds[i - tau:i].reshape((1, -1)))\n",
"d2l.plot([time, time[tau:], time[n_train + tau:]],\n",
" [x.detach().numpy(), onestep_preds.detach().numpy(),\n",
" multistep_preds[n_train + tau:].detach().numpy()], 'time',\n",
" 'x', legend=['data', '1-step preds', 'multistep preds'],\n",
" xlim=[1, 1000], figsize=(6, 3))"
],
"id": "12c3a1c3912da4dd",
"outputs": [
{
"data": {
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"cell_type": "code",
"source": [
"import collections\n",
"import re"
],
"id": "aab66c10a4c143d2",
"outputs": [],
"execution_count": 91
},
{
"metadata": {
"ExecuteTime": {
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"cell_type": "code",
"source": [
"d2l.DATA_HUB['time_machine'] = (d2l.DATA_URL + 'timemachine.txt',\n",
"'090b5e7e70c295757f55df93cb0a180b9691891a')\n",
"def read_time_machine(): #@save\n",
" \"\"\"将时间机器数据集加载到文本行的列表中\"\"\"\n",
" with open(d2l.download('time_machine'), 'r') as f:\n",
" lines = f.readlines()\n",
" return [re.sub('[^A-Za-z]+', ' ', line).strip().lower() for line in lines]\n",
"lines = read_time_machine()\n",
"print(f'# 文本总行数: {len(lines)}')\n",
"print(lines[0])\n",
"print(lines[10])"
],
"id": "1aff117af810525e",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"# 文本总行数: 3221\n",
"the time machine by h g wells\n",
"twinkled and his usually pale face was flushed and animated the\n"
]
}
],
"execution_count": 92
},
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"cell_type": "code",
"source": [
"def tokenize(lines, token='word'): #@save\n",
" \"\"\"将文本行拆分为单词或字符词元\"\"\"\n",
" if token == 'word':\n",
" return [line.split() for line in lines]\n",
" elif token == 'char':\n",
" return [list(line) for line in lines]\n",
" else:\n",
" print('错误：未知词元类型：' + token)\n",
"tokens = tokenize(lines)\n",
"for i in range(11):\n",
" print(tokens[i])"
],
"id": "eb4fe9745fbaa5e2",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"['the', 'time', 'machine', 'by', 'h', 'g', 'wells']\n",
"[]\n",
"[]\n",
"[]\n",
"[]\n",
"['i']\n",
"[]\n",
"[]\n",
"['the', 'time', 'traveller', 'for', 'so', 'it', 'will', 'be', 'convenient', 'to', 'speak', 'of', 'him']\n",
"['was', 'expounding', 'a', 'recondite', 'matter', 'to', 'us', 'his', 'grey', 'eyes', 'shone', 'and']\n",
"['twinkled', 'and', 'his', 'usually', 'pale', 'face', 'was', 'flushed', 'and', 'animated', 'the']\n"
]
}
],
"execution_count": 93
},
{
"metadata": {
"ExecuteTime": {
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},
"cell_type": "code",
"source": [
"def count_corpus(tokens): #@save\n",
" \"\"\"统计词元的频率\"\"\"\n",
" # 这里的tokens是1D列表或2D列表\n",
" if len(tokens) == 0 or isinstance(tokens[0], list):\n",
" # 将词元列表展平成一个列表\n",
" tokens = [token for line in tokens for token in line]\n",
" return collections.Counter(tokens)\n",
"class Vocab: #@save\n",
" \"\"\"文本词表\"\"\"\n",
" def __init__(self, tokens=None, min_freq=0, reserved_tokens=None):\n",
" if tokens is None:\n",
" tokens = []\n",
" if reserved_tokens is None:\n",
" reserved_tokens = []\n",
" # 按出现频率排序\n",
" counter = count_corpus(tokens)\n",
" self._token_freqs = sorted(counter.items(), key=lambda x: x[1],\n",
" reverse=True)\n",
" # 未知词元的索引为0\n",
" self.idx_to_token = ['<unk>'] + reserved_tokens\n",
" self.token_to_idx = {token: idx\n",
" for idx, token in enumerate(self.idx_to_token)}\n",
" for token, freq in self._token_freqs:\n",
" if freq < min_freq:\n",
" break\n",
" if token not in self.token_to_idx:\n",
" self.idx_to_token.append(token)\n",
" self.token_to_idx[token] = len(self.idx_to_token) - 1\n",
" def __len__(self):\n",
" return len(self.idx_to_token)\n",
" def __getitem__(self, tokens):\n",
" if not isinstance(tokens, (list, tuple)):\n",
" return self.token_to_idx.get(tokens, self.unk)\n",
" return [self.__getitem__(token) for token in tokens]\n",
" def to_tokens(self, indices):\n",
" if not isinstance(indices, (list, tuple)):\n",
" return self.idx_to_token[indices]\n",
" return [self.idx_to_token[index] for index in indices]\n",
" @property\n",
" def unk(self): # 未知词元的索引为0\n",
" return 0\n",
" @property\n",
" def token_freqs(self):\n",
" return self._token_freqs"
],
"id": "bee8e5d7b798c6c",
"outputs": [],
"execution_count": 94
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:39.084414078Z",
"start_time": "2026-03-29T09:05:39.028224941Z"
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},
"cell_type": "code",
"source": [
"vocab = Vocab(tokens)\n",
"print(list(vocab.token_to_idx.items())[:10])"
],
"id": "ff4e8ac2044850b7",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[('<unk>', 0), ('the', 1), ('i', 2), ('and', 3), ('of', 4), ('a', 5), ('to', 6), ('was', 7), ('in', 8), ('that', 9)]\n"
]
}
],
"execution_count": 95
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:39.172122701Z",
"start_time": "2026-03-29T09:05:39.098729247Z"
}
},
"cell_type": "code",
"source": [
"for i in [0, 100]:\n",
" print('文本:', tokens[i])\n",
" print('索引:', vocab[tokens[i]])"
],
"id": "a4e569dfbd251608",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"文本: ['the', 'time', 'machine', 'by', 'h', 'g', 'wells']\n",
"索引: [1, 19, 50, 40, 2183, 2184, 400]\n",
"文本: ['were', 'three', 'dimensional', 'representations', 'of', 'his', 'four', 'dimensioned']\n",
"索引: [20, 175, 1452, 2250, 4, 25, 262, 2251]\n"
]
}
],
"execution_count": 96
},
{
"metadata": {
"ExecuteTime": {
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}
},
"cell_type": "code",
"source": [
"def load_corpus_time_machine(max_tokens=-1): #@save\n",
" \"\"\"返回时光机器数据集的词元索引列表和词表\"\"\"\n",
" lines = read_time_machine()\n",
" tokens = tokenize(lines, 'char')\n",
" vocab = Vocab(tokens)\n",
" # 因为时光机器数据集中的每个文本行不一定是一个句子或一个段落，\n",
" # 所以将所有文本行展平到一个列表中\n",
" corpus = [vocab[token] for line in tokens for token in line]\n",
" if max_tokens > 0:\n",
" corpus = corpus[:max_tokens]\n",
" return corpus, vocab\n",
"corpus, vocab = load_corpus_time_machine()\n",
"\n",
"len(corpus), len(vocab)\n"
],
"id": "1b5c1776ae47af5c",
"outputs": [
{
"data": {
"text/plain": [
"(170580, 28)"
]
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}
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},
"cell_type": "code",
"source": [
"tokens = d2l.tokenize(read_time_machine())\n",
"# 因为每个文本行不一定是一个句子或一个段落，因此我们把所有文本行拼接到一起\n",
"corpus = [token for line in tokens for token in line]\n",
"vocab = d2l.Vocab(corpus)\n",
"vocab.token_freqs[:10]"
],
"id": "99deb85c025e5cdd",
"outputs": [
{
"data": {
"text/plain": [
"[('the', 2261),\n",
" ('i', 1267),\n",
" ('and', 1245),\n",
" ('of', 1155),\n",
" ('a', 816),\n",
" ('to', 695),\n",
" ('was', 552),\n",
" ('in', 541),\n",
" ('that', 443),\n",
" ('my', 440)]"
]
},
"execution_count": 98,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 98
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:39.598676534Z",
"start_time": "2026-03-29T09:05:39.332385572Z"
}
},
"cell_type": "code",
"source": [
"freqs = [freq for token, freq in vocab.token_freqs]\n",
"d2l.plot(freqs, xlabel='token: x', ylabel='frequency: n(x)',\n",
"xscale='log', yscale='log')"
],
"id": "5c0d846673e16c33",
"outputs": [
{
"data": {
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},
"metadata": {},
"output_type": "display_data",
"jetTransient": {
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}
}
],
"execution_count": 99
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:39.691613898Z",
"start_time": "2026-03-29T09:05:39.602184215Z"
}
},
"cell_type": "code",
"source": [
"bigram_tokens = [pair for pair in zip(corpus[:-1], corpus[1:])]\n",
"bigram_vocab = Vocab(bigram_tokens)\n",
"bigram_vocab.token_freqs[:10]"
],
"id": "2826e3ab0863ee64",
"outputs": [
{
"data": {
"text/plain": [
"[(('of', 'the'), 309),\n",
" (('in', 'the'), 169),\n",
" (('i', 'had'), 130),\n",
" (('i', 'was'), 112),\n",
" (('and', 'the'), 109),\n",
" (('the', 'time'), 102),\n",
" (('it', 'was'), 99),\n",
" (('to', 'the'), 85),\n",
" (('as', 'i'), 78),\n",
" (('of', 'a'), 73)]"
]
},
"execution_count": 100,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 100
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:39.773596513Z",
"start_time": "2026-03-29T09:05:39.693158268Z"
}
},
"cell_type": "code",
"source": [
"trigram_tokens = [triple for triple in zip(\n",
"corpus[:-2], corpus[1:-1], corpus[2:])]\n",
"trigram_vocab = Vocab(trigram_tokens)\n",
"trigram_vocab.token_freqs[:10]"
],
"id": "7c8cd0544bf872bb",
"outputs": [
{
"data": {
"text/plain": [
"[(('the', 'time', 'traveller'), 59),\n",
" (('the', 'time', 'machine'), 30),\n",
" (('the', 'medical', 'man'), 24),\n",
" (('it', 'seemed', 'to'), 16),\n",
" (('it', 'was', 'a'), 15),\n",
" (('here', 'and', 'there'), 15),\n",
" (('seemed', 'to', 'me'), 14),\n",
" (('i', 'did', 'not'), 14),\n",
" (('i', 'saw', 'the'), 13),\n",
" (('i', 'began', 'to'), 13)]"
]
},
"execution_count": 101,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 101
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:40.025057797Z",
"start_time": "2026-03-29T09:05:39.775024733Z"
}
},
"cell_type": "code",
"source": [
"bigram_freqs = [freq for token, freq in bigram_vocab.token_freqs]\n",
"trigram_freqs = [freq for token, freq in trigram_vocab.token_freqs]\n",
"d2l.plot([freqs, bigram_freqs, trigram_freqs], xlabel='token: x',\n",
"ylabel='frequency: n(x)', xscale='log', yscale='log',\n",
"legend=['unigram', 'bigram', 'trigram'])"
],
"id": "dc3d97dda738613d",
"outputs": [
{
"data": {
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},
"metadata": {},
"output_type": "display_data",
"jetTransient": {
"display_id": null
}
}
],
"execution_count": 102
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:40.090429874Z",
"start_time": "2026-03-29T09:05:40.040896926Z"
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},
"cell_type": "code",
"source": [
"import random\n",
"def seq_data_iter_random(corpus, batch_size, num_steps): #@save\n",
" \"\"\"使用随机抽样生成一个小批量子序列\"\"\"\n",
" # 从随机偏移量开始对序列进行分区，随机范围包括num_steps-1\n",
" corpus = corpus[random.randint(0, num_steps - 1):]\n",
" # 减去1，是因为我们需要考虑标签\n",
" num_subseqs = (len(corpus) - 1) // num_steps\n",
" # 长度为num_steps的子序列的起始索引\n",
" initial_indices = list(range(0, num_subseqs * num_steps, num_steps))\n",
" # 在随机抽样的迭代过程中，\n",
" # 来自两个相邻的、随机的、小批量中的子序列不一定在原始序列上相邻\n",
" random.shuffle(initial_indices)\n",
" def data(pos):\n",
" # 返回从pos位置开始的长度为num_steps的序列\n",
" return corpus[pos: pos + num_steps]\n",
" num_batches = num_subseqs // batch_size\n",
" for i in range(0, batch_size * num_batches, batch_size):\n",
" # 在这里，initial_indices包含子序列的随机起始索引\n",
" initial_indices_per_batch = initial_indices[i: i + batch_size]\n",
" X = [data(j) for j in initial_indices_per_batch]\n",
" Y = [data(j + 1) for j in initial_indices_per_batch]\n",
" yield torch.tensor(X), torch.tensor(Y)"
],
"id": "fd015793938b83ab",
"outputs": [],
"execution_count": 103
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:40.149638908Z",
"start_time": "2026-03-29T09:05:40.092265248Z"
}
},
"cell_type": "code",
"source": [
"my_seq = list(range(35))\n",
"for X, Y in seq_data_iter_random(my_seq, batch_size=2, num_steps=5):\n",
" print('X: ', X, '\\nY:', Y)"
],
"id": "8961f4934b8c7cc",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"X: tensor([[26, 27, 28, 29, 30],\n",
" [21, 22, 23, 24, 25]]) \n",
"Y: tensor([[27, 28, 29, 30, 31],\n",
" [22, 23, 24, 25, 26]])\n",
"X: tensor([[11, 12, 13, 14, 15],\n",
" [ 1, 2, 3, 4, 5]]) \n",
"Y: tensor([[12, 13, 14, 15, 16],\n",
" [ 2, 3, 4, 5, 6]])\n",
"X: tensor([[ 6, 7, 8, 9, 10],\n",
" [16, 17, 18, 19, 20]]) \n",
"Y: tensor([[ 7, 8, 9, 10, 11],\n",
" [17, 18, 19, 20, 21]])\n"
]
}
],
"execution_count": 104
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:40.215887628Z",
"start_time": "2026-03-29T09:05:40.163501969Z"
}
},
"cell_type": "code",
"source": [
"def seq_data_iter_sequential(corpus, batch_size, num_steps): #@save\n",
" \"\"\"使用顺序分区生成一个小批量子序列\"\"\"\n",
" # 从随机偏移量开始划分序列\n",
" offset = random.randint(0, num_steps)\n",
" num_tokens = ((len(corpus) - offset - 1) // batch_size) * batch_size\n",
" Xs = torch.tensor(corpus[offset: offset + num_tokens])\n",
" Ys = torch.tensor(corpus[offset + 1: offset + 1 + num_tokens])\n",
" Xs, Ys = Xs.reshape(batch_size, -1), Ys.reshape(batch_size, -1)\n",
" num_batches = Xs.shape[1] // num_steps\n",
" for i in range(0, num_steps * num_batches, num_steps):\n",
" X = Xs[:, i: i + num_steps]\n",
" Y = Ys[:, i: i + num_steps]\n",
" yield X, Y"
],
"id": "621b66c0614b22da",
"outputs": [],
"execution_count": 105
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:40.267211418Z",
"start_time": "2026-03-29T09:05:40.217997368Z"
}
},
"cell_type": "code",
"source": [
"class SeqDataLoader:\n",
" \"\"\"加载序列数据的迭代器\"\"\"\n",
" def __init__(self, batch_size, num_steps, use_random_iter, max_tokens):\n",
" if use_random_iter:\n",
" self.data_iter_fn = seq_data_iter_random\n",
" else:\n",
" self.data_iter_fn = seq_data_iter_sequential\n",
" self.corpus, self.vocab = load_corpus_time_machine(max_tokens)\n",
" self.batch_size, self.num_steps = batch_size, num_steps\n",
" def __iter__(self):\n",
" return self.data_iter_fn(self.corpus, self.batch_size, self.num_steps)\n",
"def load_data_time_machine(batch_size, num_steps, #@save\n",
" use_random_iter=False, max_tokens=10000):\n",
" \"\"\"返回时光机器数据集的迭代器和词表\"\"\"\n",
" data_iter = SeqDataLoader(\n",
" batch_size, num_steps, use_random_iter, max_tokens)\n",
" return data_iter, data_iter.vocab"
],
"id": "f09fe2507a925fe9",
"outputs": [],
"execution_count": 106
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:40.327565785Z",
"start_time": "2026-03-29T09:05:40.269141766Z"
}
},
"cell_type": "code",
"source": [
"batch_size, num_steps = 32, 35\n",
"train_iter, vocab = load_data_time_machine(batch_size, num_steps)"
],
"id": "69272a664d3b9ae1",
"outputs": [],
"execution_count": 107
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:40.390353470Z",
"start_time": "2026-03-29T09:05:40.335766683Z"
}
},
"cell_type": "code",
"source": "F.one_hot(torch.tensor([0,2]),len(vocab))",
"id": "35806d36e5ec3ca7",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n",
" 0, 0, 0, 0],\n",
" [0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n",
" 0, 0, 0, 0]])"
]
},
"execution_count": 108,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 108
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:40.545044245Z",
"start_time": "2026-03-29T09:05:40.446941053Z"
}
},
"cell_type": "code",
"source": [
"X = torch.arange(10).reshape((2, 5))\n",
"F.one_hot(X.T, 28).shape"
],
"id": "6a4695284b898013",
"outputs": [
{
"data": {
"text/plain": [
"torch.Size([5, 2, 28])"
]
},
"execution_count": 109,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 109
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:40.636340487Z",
"start_time": "2026-03-29T09:05:40.574500540Z"
}
},
"cell_type": "code",
"source": [
"def get_params(vocab_size, num_hiddens, device):\n",
" num_inputs = num_outputs = vocab_size\n",
" def normal(shape):\n",
" return torch.randn(size=shape, device=device) * 0.01\n",
" # 隐藏层参数\n",
" W_xh = normal((num_inputs, num_hiddens))\n",
" W_hh = normal((num_hiddens, num_hiddens))\n",
" b_h = torch.zeros(num_hiddens, device=device)\n",
" # 输出层参数\n",
" W_hq = normal((num_hiddens, num_outputs))\n",
" b_q = torch.zeros(num_outputs, device=device)\n",
" # 附加梯度\n",
" params = [W_xh, W_hh, b_h, W_hq, b_q]\n",
" '''\n",
" W_xh x->H_t\n",
" W_hh H_t-1->H_t\n",
" W_hq H_t->opt\n",
" '''\n",
" for param in params:\n",
" param.requires_grad_(True)\n",
" return params\n",
"def init_rnn_state(batch_size, num_hiddens, device):\n",
" return (torch.zeros((batch_size, num_hiddens), device=device), )\n",
"def rnn(inputs,state,params):\n",
" W_xh,W_hh,b_h,W_hq,b_q = params\n",
" H, = state\n",
" outputs = []\n",
" for X in inputs: # X (batchs,vocab)\n",
" H = torch.tanh(torch.mm(X,W_xh)+torch.mm(H,W_hh)+b_h)\n",
" Y = torch.mm(H,W_hq)+b_q\n",
" outputs.append(Y)\n",
" return torch.cat(outputs,dim=0),(H,)\n",
"class RNNModelScratch: #@save\n",
" \"\"\"从零开始实现的循环神经网络模型\"\"\"\n",
" def __init__(self, vocab_size, num_hiddens, device,\n",
" get_params, init_state, forward_fn):\n",
" self.vocab_size, self.num_hiddens = vocab_size, num_hiddens\n",
" self.params = get_params(vocab_size, num_hiddens, device)\n",
" self.init_state, self.forward_fn = init_state, forward_fn\n",
" def __call__(self, X, state):\n",
" X = F.one_hot(X.T, self.vocab_size).type(torch.float32)\n",
" return self.forward_fn(X, state, self.params)\n",
" def begin_state(self, batch_size, device):\n",
" return self.init_state(batch_size, self.num_hiddens, device)"
],
"id": "405f7c6af8bdd939",
"outputs": [],
"execution_count": 110
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:40.714678739Z",
"start_time": "2026-03-29T09:05:40.640615581Z"
}
},
"cell_type": "code",
"source": [
"num_hiddens = 512\n",
"net = RNNModelScratch(len(vocab), num_hiddens, d2l.try_gpu(), get_params,\n",
"init_rnn_state, rnn)\n",
"state = net.begin_state(X.shape[0], d2l.try_gpu())\n",
"Y, new_state = net(X.to(d2l.try_gpu()), state)\n",
"Y.shape, len(new_state), new_state[0].shape"
],
"id": "7bdd0b37b1458ec2",
"outputs": [
{
"data": {
"text/plain": [
"(torch.Size([10, 28]), 1, torch.Size([2, 512]))"
]
},
"execution_count": 111,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 111
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:40.933485442Z",
"start_time": "2026-03-29T09:05:40.715946914Z"
}
},
"cell_type": "code",
"source": [
"def predict_ch8(prefix, num_preds, net, vocab, device): #@save\n",
" \"\"\"在prefix后面生成新字符\"\"\"\n",
" state = net.begin_state(batch_size=1, device=device)\n",
" outputs = [vocab[prefix[0]]]\n",
" get_input = lambda: torch.tensor([outputs[-1]], device=device).reshape((1, 1))\n",
" for y in prefix[1:]: # 预热期\n",
" _, state = net(get_input(), state)\n",
" outputs.append(vocab[y])\n",
" for _ in range(num_preds): # 预测num_preds步\n",
" y, state = net(get_input(), state)\n",
" outputs.append(int(y.argmax(dim=1).reshape(1)))\n",
" return ''.join([vocab.idx_to_token[i] for i in outputs])\n",
"predict_ch8('time traveller ', 10, net, vocab, d2l.try_gpu())"
],
"id": "f38dbe2b11e02bc2",
"outputs": [
{
"data": {
"text/plain": [
"'time traveller qxyumumumu'"
]
},
"execution_count": 112,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 112
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:40.987574570Z",
"start_time": "2026-03-29T09:05:40.936566018Z"
}
},
"cell_type": "code",
"source": [
"def grad_clipping(net, theta): #@save\n",
" \"\"\"裁剪梯度\"\"\"\n",
" if isinstance(net, nn.Module):\n",
" params = [p for p in net.parameters() if p.requires_grad]\n",
" else:\n",
" params = net.params\n",
" norm = torch.sqrt(sum(torch.sum((p.grad ** 2)) for p in params))\n",
" if norm > theta:\n",
" for param in params:\n",
" param.grad[:] *= theta / norm"
],
"id": "6c19717736ffbc68",
"outputs": [],
"execution_count": 113
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:41.038078698Z",
"start_time": "2026-03-29T09:05:40.989835785Z"
}
},
"cell_type": "code",
"source": [
"import math\n",
"def train_epoch_ch8(net, train_iter, loss, updater, device, use_random_iter):\n",
" \"\"\"训练网络一个迭代周期（定义见第8章）\"\"\"\n",
" state, timer = None, d2l.Timer()\n",
" metric = d2l.Accumulator(2) # 训练损失之和,词元数量\n",
" for X, Y in train_iter:\n",
" if state is None or use_random_iter:\n",
" # 在第一次迭代或使用随机抽样时初始化state\n",
" state = net.begin_state(batch_size=X.shape[0], device=device)\n",
" else:\n",
" if isinstance(net, nn.Module) and not isinstance(state, tuple):\n",
" # state对于nn.GRU是个张量\n",
" state.detach_()\n",
" else:\n",
" # state对于nn.LSTM或对于我们从零开始实现的模型是个张量\n",
" for s in state:\n",
" s.detach_()\n",
" y = Y.T.reshape(-1)\n",
" X, y = X.to(device), y.to(device)\n",
" y_hat, state = net(X, state)\n",
" l = loss(y_hat, y.long()).mean()\n",
" if isinstance(updater, torch.optim.Optimizer):\n",
" updater.zero_grad()\n",
" l.backward()\n",
" grad_clipping(net, 1)\n",
" updater.step()\n",
" else:\n",
" l.backward()\n",
" grad_clipping(net, 1)\n",
" # 因为已经调用了mean函数\n",
" updater(batch_size=1)\n",
" metric.add(l * y.numel(), y.numel())\n",
" return math.exp(metric[0]/metric[1]),metric[1]/timer.stop()\n"
],
"id": "37ef611dedcb714b",
"outputs": [],
"execution_count": 114
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:41.089234437Z",
"start_time": "2026-03-29T09:05:41.040415821Z"
}
},
"cell_type": "code",
"source": [
"def train_ch8(net, train_iter, vocab, lr, num_epochs, device,\n",
"use_random_iter=False):\n",
" \"\"\"训练模型（定义见第8章）\"\"\"\n",
" loss = nn.CrossEntropyLoss()\n",
" animator = d2l.Animator(xlabel='epoch', ylabel='perplexity',\n",
" legend=['train'], xlim=[10, num_epochs])\n",
" # 初始化\n",
" if isinstance(net, nn.Module):\n",
" updater = torch.optim.SGD(net.parameters(), lr)\n",
" else:\n",
" updater = lambda batch_size: d2l.sgd(net.params, lr, batch_size)\n",
" predict = lambda prefix: predict_ch8(prefix, 50, net, vocab, device)\n",
" # 训练和预测\n",
" for epoch in range(num_epochs):\n",
" ppl, speed = train_epoch_ch8(\n",
" net, train_iter, loss, updater, device, use_random_iter)\n",
" if (epoch + 1) % 10 == 0:\n",
" print(predict('time traveller'))\n",
" animator.add(epoch + 1, [ppl])\n",
" print(f'困惑度 {ppl:.1f}, {speed:.1f} 词元/秒 {str(device)}')\n",
" print(predict('time traveller'))\n",
" print(predict('traveller'))"
],
"id": "c96b60b55664378a",
"outputs": [],
"execution_count": 115
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:41.147914921Z",
"start_time": "2026-03-29T09:05:41.099546332Z"
}
},
"cell_type": "code",
"source": [
"num_epochs, lr = 500, 1\n",
"#train_ch8(net, train_iter, vocab, lr, num_epochs, d2l.try_gpu())"
],
"id": "ab4a2fbf4dfd21ef",
"outputs": [],
"execution_count": 116
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:41.196189157Z",
"start_time": "2026-03-29T09:05:41.149680280Z"
}
},
"cell_type": "code",
"source": [
"batch_size, num_steps = 32, 35\n",
"train_iter, vocab = load_data_time_machine(batch_size, num_steps)"
],
"id": "74d672745751714",
"outputs": [],
"execution_count": 117
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:41.583876478Z",
"start_time": "2026-03-29T09:05:41.197696611Z"
}
},
"cell_type": "code",
"source": [
"num_hiddens = 256\n",
"rnn_layer = nn.RNN(len(vocab), num_hiddens)\n",
"state = torch.zeros((1,batch_size,num_hiddens))\n",
"X = torch.rand(size=(num_steps, batch_size, len(vocab)))\n",
"Y, state_new = rnn_layer(X, state)\n",
"Y.shape, state_new.shape"
],
"id": "9694c029c9e657e8",
"outputs": [
{
"data": {
"text/plain": [
"(torch.Size([35, 32, 256]), torch.Size([1, 32, 256]))"
]
},
"execution_count": 118,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 118
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:41.638041580Z",
"start_time": "2026-03-29T09:05:41.586864085Z"
}
},
"cell_type": "code",
"source": [
"class RNNModel(nn.Module):\n",
" \"\"\"循环神经网络模型\"\"\"\n",
" def __init__(self, rnn_layer, vocab_size, **kwargs):\n",
" super(RNNModel, self).__init__(**kwargs)\n",
" self.rnn = rnn_layer\n",
" self.vocab_size = vocab_size\n",
" self.num_hiddens = self.rnn.hidden_size\n",
" # 如果RNN是双向的（之后将介绍），num_directions应该是2，否则应该是1\n",
" if not self.rnn.bidirectional:\n",
" self.num_directions = 1\n",
" self.linear = nn.Linear(self.num_hiddens, self.vocab_size)\n",
" else:\n",
" self.num_directions = 2\n",
" self.linear = nn.Linear(self.num_hiddens * 2, self.vocab_size)\n",
" def forward(self, inputs, state):\n",
" X = F.one_hot(inputs.T.long(), self.vocab_size)\n",
" X = X.to(torch.float32)\n",
" Y, state = self.rnn(X, state)\n",
" # 全连接层首先将Y的形状改为(时间步数*批量大小,隐藏单元数)\n",
" # 它的输出形状是(时间步数*批量大小,词表大小)。\n",
" output = self.linear(Y.reshape((-1, Y.shape[-1])))\n",
" return output, state\n",
" def begin_state(self, device, batch_size=1):\n",
" if not isinstance(self.rnn, nn.LSTM):\n",
" # nn.GRU以张量作为隐状态\n",
" return torch.zeros((self.num_directions * self.rnn.num_layers,\n",
" batch_size, self.num_hiddens),\n",
" device=device)\n",
" else:\n",
" # nn.LSTM以元组作为隐状态\n",
" return (torch.zeros((\n",
" self.num_directions * self.rnn.num_layers,\n",
" batch_size, self.num_hiddens), device=device),\n",
" torch.zeros((\n",
" self.num_directions * self.rnn.num_layers,\n",
" batch_size, self.num_hiddens), device=device))"
],
"id": "858873034be01538",
"outputs": [],
"execution_count": 119
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:41.686881805Z",
"start_time": "2026-03-29T09:05:41.640393942Z"
}
},
"cell_type": "code",
"source": [
"device = d2l.try_gpu()\n",
"net = RNNModel(rnn_layer, vocab_size=len(vocab))\n",
"net = net.to(device)\n",
"#predict_ch8('time traveller', 10, net, vocab, device)"
],
"id": "d59c1599998c8fd4",
"outputs": [],
"execution_count": 120
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:41.737181902Z",
"start_time": "2026-03-29T09:05:41.688775143Z"
}
},
"cell_type": "code",
"source": [
"vocab_size, num_hiddens, device = len(vocab), 256, d2l.try_gpu()\n",
"num_inputs = vocab_size\n",
"gru_layer = nn.GRU(num_inputs, num_hiddens)\n",
"model = RNNModel(gru_layer, len(vocab))\n",
"model = model.to(device)\n",
"#train_ch8(model, train_iter, vocab, lr, num_epochs, device)"
],
"id": "adda23bc3664ec6b",
"outputs": [],
"execution_count": 121
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:41.786646674Z",
"start_time": "2026-03-29T09:05:41.738416914Z"
}
},
"cell_type": "code",
"source": [
"num_inputs = vocab_size\n",
"lstm_layer = nn.LSTM(num_inputs, num_hiddens)\n",
"model = RNNModel(lstm_layer, len(vocab))\n",
"model = model.to(device)\n",
"#train_ch8(model, train_iter, vocab, lr, num_epochs, device)"
],
"id": "b4e30d643d6f755d",
"outputs": [],
"execution_count": 122
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:41.841175343Z",
"start_time": "2026-03-29T09:05:41.788640688Z"
}
},
"cell_type": "code",
"source": [
"d2l.DATA_HUB['fra-eng'] = (d2l.DATA_URL + 'fra-eng.zip',\n",
" '94646ad1522d915e7b0f9296181140edcf86a4f5')"
],
"id": "50554e839be36011",
"outputs": [],
"execution_count": 123
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:41.893584442Z",
"start_time": "2026-03-29T09:05:41.843443764Z"
}
},
"cell_type": "code",
"source": [
"import os\n",
"def read_data_nmt():\n",
" \"\"\"载入“英语－法语”数据集\"\"\"\n",
" data_dir = d2l.download_extract('fra-eng')\n",
" with open(os.path.join(data_dir, 'fra.txt'), 'r',\n",
" encoding='utf-8') as f:\n",
" return f.read()"
],
"id": "9cd4287ed84db220",
"outputs": [],
"execution_count": 124
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:41.981913006Z",
"start_time": "2026-03-29T09:05:41.895418207Z"
}
},
"cell_type": "code",
"source": [
"raw_text = read_data_nmt()\n",
"print(raw_text[:75])"
],
"id": "7c4452b3b6a32f91",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Go.\tVa !\n",
"Hi.\tSalut !\n",
"Run!\tCours !\n",
"Run!\tCourez !\n",
"Who?\tQui ?\n",
"Wow!\tÇa alors !\n",
"\n"
]
}
],
"execution_count": 125
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:43.184417099Z",
"start_time": "2026-03-29T09:05:41.984779926Z"
}
},
"cell_type": "code",
"source": [
"def preprocess_nmt(text):\n",
" def no_space(char,prev_char):\n",
" return char in set(',.!?') and prev_char != ' '\n",
" text = text.replace('\\u202f',' ').replace('\\xa0',' ').lower()\n",
" out = [' ' + char if i >0 and no_space(char,text[i-1]) else char for i,char in enumerate(text)]\n",
" return ''.join(out)\n",
"text = preprocess_nmt(raw_text)\n",
"print(text[:80])"
],
"id": "1c729da265572287",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"go .\tva !\n",
"hi .\tsalut !\n",
"run !\tcours !\n",
"run !\tcourez !\n",
"who ?\tqui ?\n",
"wow !\tça alors !\n"
]
}
],
"execution_count": 126
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:43.281720452Z",
"start_time": "2026-03-29T09:05:43.232801710Z"
}
},
"cell_type": "code",
"source": [
"def tokenize_nmt(text,num_examples=None):\n",
" source,target = [],[]\n",
" for i,line in enumerate(text.split('\\n')):\n",
" if num_examples and i > num_examples:\n",
" break\n",
" parts = line.split('\\t')\n",
" if len(parts) == 2:\n",
" source.append(parts[0].split(' '))\n",
" target.append(parts[1].split(' '))\n",
" return source,target\n",
"\n"
],
"id": "ca16ef22cbe2c02a",
"outputs": [],
"execution_count": 127
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:43.925371949Z",
"start_time": "2026-03-29T09:05:43.283929461Z"
}
},
"cell_type": "code",
"source": [
"source, target = tokenize_nmt(text)\n",
"source[:6], target[:6]"
],
"id": "5ece5cb4b78168d0",
"outputs": [
{
"data": {
"text/plain": [
"([['go', '.'],\n",
" ['hi', '.'],\n",
" ['run', '!'],\n",
" ['run', '!'],\n",
" ['who', '?'],\n",
" ['wow', '!']],\n",
" [['va', '!'],\n",
" ['salut', '!'],\n",
" ['cours', '!'],\n",
" ['courez', '!'],\n",
" ['qui', '?'],\n",
" ['ça', 'alors', '!']])"
]
},
"execution_count": 128,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 128
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:44.088961043Z",
"start_time": "2026-03-29T09:05:43.974341311Z"
}
},
"cell_type": "code",
"source": [
"def show_list_len_pair_hist(legend,xlabel,ylabel,xlist,ylist):\n",
" d2l.set_figsize()\n",
" _,_,patches = d2l.plt.hist([[len(l) for l in xlist],[len(l) for l in ylist]])\n",
" d2l.plt.xlabel(xlabel)\n",
" d2l.plt.ylabel(ylabel)\n",
" for patch in patches[1].patches:\n",
" patch.set_hatch('/')\n",
" d2l.plt.legend(legend)\n",
"\n",
"show_list_len_pair_hist(['source','target'],'# tokens per sequence','count',source,target)"
],
"id": "518249f852ec54c4",
"outputs": [
{
"data": {
"text/plain": [
"<Figure size 350x250 with 1 Axes>"
],
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},
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"output_type": "display_data",
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}
}
],
"execution_count": 129
},
{
"metadata": {
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},
"cell_type": "code",
"source": [
"src_vocab=Vocab(source,min_freq=2,reserved_tokens=['<pad>','<bos>','<eos>'])\n",
"len(src_vocab)"
],
"id": "c2dc82617d5a41a4",
"outputs": [
{
"data": {
"text/plain": [
"10012"
]
},
"execution_count": 130,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 130
},
{
"metadata": {
"ExecuteTime": {
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}
},
"cell_type": "code",
"source": [
"def truncate_pad(line,num_steps,padding_token):\n",
" if len(line) > num_steps:\n",
" return line[:num_steps]\n",
" return line + [padding_token] * (num_steps - len(line))\n",
"truncate_pad(src_vocab[source[0]], 10, src_vocab['<pad>'])"
],
"id": "93ae326a3258ecc",
"outputs": [
{
"data": {
"text/plain": [
"[47, 4, 1, 1, 1, 1, 1, 1, 1, 1]"
]
},
"execution_count": 131,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 131
},
{
"metadata": {
"ExecuteTime": {
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"start_time": "2026-03-29T09:05:44.279624651Z"
}
},
"cell_type": "code",
"source": [
"def build_array_nmt(lines, vocab, num_steps):\n",
" \"\"\"将机器翻译的文本序列转换成小批量\"\"\"\n",
" lines = [vocab[l] for l in lines]\n",
" lines = [l + [vocab['<eos>']] for l in lines]\n",
" array = torch.tensor([truncate_pad(\n",
" l, num_steps, vocab['<pad>']) for l in lines])\n",
" valid_len = (array != vocab['<pad>']).type(torch.int32).sum(1)\n",
" return array, valid_len"
],
"id": "acd4344e678cf487",
"outputs": [],
"execution_count": 132
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:44.376299140Z",
"start_time": "2026-03-29T09:05:44.328437032Z"
}
},
"cell_type": "code",
"source": [
"def load_data_nmt(batch_size, num_steps, num_examples=600):\n",
" \"\"\"返回翻译数据集的迭代器和词表\"\"\"\n",
" text = preprocess_nmt(read_data_nmt())\n",
" source, target = tokenize_nmt(text, num_examples)\n",
" src_vocab = d2l.Vocab(source, min_freq=2,\n",
" reserved_tokens=['<pad>', '<bos>', '<eos>'])\n",
" tgt_vocab = d2l.Vocab(target, min_freq=2,\n",
" reserved_tokens=['<pad>', '<bos>', '<eos>'])\n",
" src_array, src_valid_len = build_array_nmt(source, src_vocab, num_steps)\n",
" tgt_array, tgt_valid_len = build_array_nmt(target, tgt_vocab, num_steps)\n",
" data_arrays = (src_array, src_valid_len, tgt_array, tgt_valid_len)\n",
" data_iter = d2l.load_array(data_arrays, batch_size)\n",
" return data_iter, src_vocab, tgt_vocab"
],
"id": "62586b0175993a4f",
"outputs": [],
"execution_count": 133
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T09:05:45.610515926Z",
"start_time": "2026-03-29T09:05:44.378149052Z"
}
},
"cell_type": "code",
"source": [
"train_iter, src_vocab, tgt_vocab = load_data_nmt(batch_size=2, num_steps=8)\n",
"for X, X_valid_len, Y, Y_valid_len in train_iter:\n",
" print('X:', X.type(torch.int32))\n",
" print('X的有效长度:', X_valid_len)\n",
" print('Y:', Y.type(torch.int32))\n",
" print('Y的有效长度:', Y_valid_len)\n",
" break"
],
"id": "87a2f147db41a91d",
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"X: tensor([[81, 6, 2, 4, 5, 5, 5, 5],\n",
" [81, 11, 96, 2, 4, 5, 5, 5]], dtype=torch.int32)\n",
"X的有效长度: tensor([4, 5])\n",
"Y: tensor([[103, 79, 166, 55, 105, 6, 2, 4],\n",
" [100, 171, 75, 2, 4, 5, 5, 5]], dtype=torch.int32)\n",
"Y的有效长度: tensor([8, 5])\n"
]
}
],
"execution_count": 134
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T12:26:28.968567662Z",
"start_time": "2026-03-29T12:26:28.880277260Z"
}
},
"cell_type": "code",
"source": [
"class Encoder(nn.Module):\n",
" def __init__(self,**kargs):\n",
" super(Encoder,self).__init__(**kargs)\n",
" def forward(self,X,*args):\n",
" raise NotImplementedError(\"必须实现这个方法\")\n",
"class Decoder(nn.Module):\n",
" \"\"\"编码器-解码器架构的基本解码器接口\"\"\"\n",
" def __init__(self, **kwargs):\n",
" super(Decoder, self).__init__(**kwargs)\n",
" def init_state(self, enc_outputs, *args):\n",
" raise NotImplementedError\n",
" def forward(self, X, state):\n",
" raise NotImplementedError\n",
"class EncoderDecoder(nn.Module):\n",
" \"\"\"编码器-解码器架构的基类\"\"\"\n",
" def __init__(self, encoder, decoder, **kwargs):\n",
" super(EncoderDecoder, self).__init__(**kwargs)\n",
" self.encoder = encoder\n",
" self.decoder = decoder\n",
" def forward(self, enc_X, dec_X, *args):\n",
" enc_outputs = self.encoder(enc_X, *args)\n",
" dec_state = self.decoder.init_state(enc_outputs, *args)\n",
" return self.decoder(dec_X, dec_state)\n",
"class Seq2SeqEncoder(Encoder):\n",
" def __init__(self,vocab_size,embed_size,num_hiddens,num_layers,dropout=0,**kwargs):\n",
" super(Seq2SeqEncoder, self).__init__(**kwargs)\n",
" self.embedding = nn.Embedding(vocab_size, embed_size)\n",
" self.rnn = nn.GRU(embed_size,num_hiddens,num_layers,dropout=dropout)\n",
" def forward(self,X,*args):\n",
" X = self.embedding(X)\n",
" X = X.permute(1,0,2) #(batch,steps,embed_size) -> (steps,batch,embed_size)\n",
" output,state = self.rnn(X)\n",
" return output,state\n",
" # shape of output (steps,batch,num_hiddens)\n",
" # shape of state (num_layers,batch,num_hiddens)\n",
"encoder = Seq2SeqEncoder(vocab_size=10, embed_size=8, num_hiddens=16,\n",
" num_layers=2)\n",
"X = torch.zeros((4,7),dtype=torch.long) #one-hot is integer\n",
"output,state = encoder(X)\n",
"output.shape\n"
],
"id": "d0d01aef4857ee9c",
"outputs": [
{
"data": {
"text/plain": [
"torch.Size([7, 4, 16])"
]
},
"execution_count": 139,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 139
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T12:26:43.259123495Z",
"start_time": "2026-03-29T12:26:43.204225780Z"
}
},
"cell_type": "code",
"source": "state.shape",
"id": "bba15a040c10cb01",
"outputs": [
{
"data": {
"text/plain": [
"torch.Size([2, 4, 16])"
]
},
"execution_count": 140,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 140
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T13:47:51.954052296Z",
"start_time": "2026-03-29T13:47:51.853781706Z"
}
},
"cell_type": "code",
"source": [
"class Seq2SeqDecoder(Decoder):\n",
" def __init__(self,vocab_size,embed_size,num_hiddens,num_layers,dropout=0,**kwargs):\n",
" super(Seq2SeqDecoder, self).__init__(**kwargs)\n",
" self.embedding = nn.Embedding(vocab_size, embed_size)\n",
" self.rnn = nn.GRU(embed_size+num_hiddens,num_hiddens,num_layers,dropout=dropout)\n",
" self.dense = nn.Linear(num_hiddens,vocab_size)\n",
" def init_state(self,enc_outputs,*args):\n",
" return enc_outputs[1]\n",
" def forward(self,X,state):\n",
" X = self.embedding(X).permute(1,0,2)\n",
" context = state[-1].repeat(X.shape[0],1,1)\n",
" X_and_context = torch.cat((X,context),2)\n",
" output,state = self.rnn(X_and_context,state)\n",
" output = self.dense(output).permute(1,0,2)\n",
" return output,state"
],
"id": "b659bfd2fdcabebe",
"outputs": [],
"execution_count": 141
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T13:48:04.405972579Z",
"start_time": "2026-03-29T13:48:04.307991931Z"
}
},
"cell_type": "code",
"source": [
"decoder = Seq2SeqDecoder(vocab_size=10, embed_size=8, num_hiddens=16,\n",
"num_layers=2)\n",
"decoder.eval()\n",
"state = decoder.init_state(encoder(X))\n",
"output, state = decoder(X, state)\n",
"output.shape, state.shape"
],
"id": "e9c451e560ce3769",
"outputs": [
{
"data": {
"text/plain": [
"(torch.Size([4, 7, 10]), torch.Size([2, 4, 16]))"
]
},
"execution_count": 142,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 142
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T13:56:58.324121647Z",
"start_time": "2026-03-29T13:56:58.160904863Z"
}
},
"cell_type": "code",
"source": [
"def sequence_mask(X, valid_len, value=0):\n",
" \"\"\"在序列中屏蔽不相关的项\"\"\"\n",
" maxlen = X.size(1)\n",
" mask = torch.arange((maxlen), dtype=torch.float32,\n",
" device=X.device)[None, :] < valid_len[:, None]\n",
" X[~mask] = value\n",
" return X\n",
"X = torch.tensor([[1, 2, 3], [4, 5, 6]])\n",
"sequence_mask(X, torch.tensor([1, 2]))"
],
"id": "9ee2db877c089d48",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[1, 0, 0],\n",
" [4, 5, 0]])"
]
},
"execution_count": 143,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 143
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T13:57:55.473311100Z",
"start_time": "2026-03-29T13:57:55.287150264Z"
}
},
"cell_type": "code",
"source": [
"X = torch.ones(2, 3, 4)\n",
"sequence_mask(X, torch.tensor([1, 2]), value=-1)"
],
"id": "caca450bdfe7f650",
"outputs": [
{
"data": {
"text/plain": [
"tensor([[[ 1., 1., 1., 1.],\n",
" [-1., -1., -1., -1.],\n",
" [-1., -1., -1., -1.]],\n",
"\n",
" [[ 1., 1., 1., 1.],\n",
" [ 1., 1., 1., 1.],\n",
" [-1., -1., -1., -1.]]])"
]
},
"execution_count": 144,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 144
},
{
"metadata": {
"ExecuteTime": {
"end_time": "2026-03-29T14:08:10.919373362Z",
"start_time": "2026-03-29T14:08:10.636085289Z"
}
},
"cell_type": "code",
"source": [
"class MaskedSoftmaxCELoss(nn.CrossEntropyLoss):\n",
" \"\"\"带遮蔽的softmax交叉熵损失函数\"\"\"\n",
" # pred的形状：(batch_size,num_steps,vocab_size)\n",
" # label的形状：(batch_size,num_steps)\n",
" # valid_len的形状：(batch_size,)\n",
" def forward(self, pred, label, valid_len):\n",
" weights = torch.ones_like(label)\n",
" weights = sequence_mask(weights, valid_len)\n",
" self.reduction='none'\n",
" unweighted_loss = super(MaskedSoftmaxCELoss, self).forward(\n",
" pred.permute(0, 2, 1), label)\n",
" weighted_loss = (unweighted_loss * weights).mean(dim=1)\n",
" return weighted_loss\n",
"loss = MaskedSoftmaxCELoss()\n",
"loss(torch.ones(3, 4, 10), torch.ones((3, 4), dtype=torch.long),\n",
"torch.tensor([4, 2, 0]))"
],
"id": "46fc96f0246f32b7",
"outputs": [
{
"data": {
"text/plain": [
"tensor([2.3026, 1.1513, 0.0000])"
]
},
"execution_count": 145,
"metadata": {},
"output_type": "execute_result"
}
],
"execution_count": 145
},
{
"metadata": {},
"cell_type": "code",
"outputs": [],
"execution_count": null,
"source": "",
"id": "69c315b5875fc288"
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3",
"language": "python",
"name": "python3"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 2
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.6"
}
},
"nbformat": 4,
"nbformat_minor": 5
}
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