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machine-learning/04_linear_classifier/04_linear_classifier.ipynb
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"## 目录\n",
"\n",
"- 感知机分类器\n",
"- 逻辑回归分类器\n",
"- 图像分类数据集\n",
"- softmax回归的从零开始实现\n",
"- softmax回归的简洁实现"
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"## 感知机分类器"
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"Perceptron是一个线性分类器。它的工作方式与没有隐藏层的神经网络相同(只有输入和输出)。\n",
"\n",
"![perceptron](perceptron.png)\n",
"\n",
"首先,它对给定的数据集进行权重训练,然后通过网络对一个新项目进行分类。\n",
"\n",
"> 注意,在分类问题中,每个节点代表一个类别。最终的分类是具有最大输出值的类/节点。"
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"### 实现\n",
"\n",
"`PerceptionLinearLearner` 用于训练(计算)给定数据集的权重。\n",
"\n",
"函数`predict`用于对一个新的项目进行分类:该函数计算项目与外层每个节点的计算权重的(代数)点积。然后,它选择一个最大的值,将项目归入相应的类别。"
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"<div class=\"highlight\"><pre><span></span><span class=\"k\">class</span> <span class=\"nc\">PerceptionLinearLearner</span><span class=\"p\">(</span><span class=\"n\">LinearClassifier</span><span class=\"p\">):</span>\n",
"<span class=\"w\"> </span><span class=\"sd\">&quot;&quot;&quot;</span>\n",
"<span class=\"sd\"> Perception linear classifier: hard threshold</span>\n",
"<span class=\"sd\"> &quot;&quot;&quot;</span>\n",
" <span class=\"k\">def</span> <span class=\"fm\">__init__</span><span class=\"p\">(</span><span class=\"bp\">self</span><span class=\"p\">,</span> <span class=\"n\">dataset</span><span class=\"p\">,</span> <span class=\"n\">learning_rate</span><span class=\"o\">=</span><span class=\"mf\">0.01</span><span class=\"p\">,</span> <span class=\"n\">epochs</span><span class=\"o\">=</span><span class=\"mi\">100</span><span class=\"p\">):</span>\n",
" <span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">idx_i</span> <span class=\"o\">=</span> <span class=\"n\">dataset</span><span class=\"o\">.</span><span class=\"n\">inputs</span>\n",
" <span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">idx_t</span> <span class=\"o\">=</span> <span class=\"n\">dataset</span><span class=\"o\">.</span><span class=\"n\">target</span>\n",
" <span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">examples</span> <span class=\"o\">=</span> <span class=\"n\">dataset</span><span class=\"o\">.</span><span class=\"n\">examples</span>\n",
" <span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">num_examples</span> <span class=\"o\">=</span> <span class=\"nb\">len</span><span class=\"p\">(</span><span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">examples</span><span class=\"p\">)</span>\n",
" <span class=\"c1\"># initialize random weights</span>\n",
" <span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">w</span> <span class=\"o\">=</span> <span class=\"n\">random_weights</span><span class=\"p\">(</span><span class=\"n\">min_value</span><span class=\"o\">=-</span><span class=\"mf\">0.5</span><span class=\"p\">,</span> <span class=\"n\">max_value</span><span class=\"o\">=</span><span class=\"mf\">0.5</span><span class=\"p\">,</span> <span class=\"n\">num_weights</span><span class=\"o\">=</span><span class=\"nb\">len</span><span class=\"p\">(</span><span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">idx_i</span><span class=\"p\">)</span> <span class=\"o\">+</span> <span class=\"mi\">1</span><span class=\"p\">)</span>\n",
" <span class=\"c1\"># learning loop</span>\n",
" <span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">learn</span><span class=\"p\">(</span><span class=\"n\">learning_rate</span><span class=\"p\">,</span> <span class=\"n\">epochs</span><span class=\"p\">)</span>\n",
" \n",
" <span class=\"k\">def</span> <span class=\"nf\">learn</span><span class=\"p\">(</span><span class=\"bp\">self</span><span class=\"p\">,</span> <span class=\"n\">learning_rate</span><span class=\"p\">,</span> <span class=\"n\">epochs</span><span class=\"p\">):</span>\n",
"<span class=\"w\"> </span><span class=\"sd\">&quot;&quot;&quot; learning loop &quot;&quot;&quot;</span>\n",
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"<span class=\"w\"> </span><span class=\"sd\">&quot;&quot;&quot; error: difference between estimation and true value &quot;&quot;&quot;</span>\n",
" <span class=\"k\">raise</span> <span class=\"ne\">NotImplementedError</span>\n",
" \n",
" <span class=\"k\">def</span> <span class=\"nf\">update</span><span class=\"p\">(</span><span class=\"n\">w</span><span class=\"p\">,</span> <span class=\"n\">learning_rate</span><span class=\"p\">,</span> <span class=\"n\">err</span><span class=\"p\">,</span> <span class=\"n\">X_col</span><span class=\"p\">,</span> <span class=\"n\">num_examples</span><span class=\"p\">):</span>\n",
"<span class=\"w\"> </span><span class=\"sd\">&quot;&quot;&quot; update weights &quot;&quot;&quot;</span>\n",
" <span class=\"k\">raise</span> <span class=\"ne\">NotImplementedError</span>\n",
"\n",
" <span class=\"k\">def</span> <span class=\"nf\">homogeneous</span><span class=\"p\">(</span><span class=\"n\">num_examples</span><span class=\"p\">):</span>\n",
"<span class=\"w\"> </span><span class=\"sd\">&quot;&quot;&quot; build homogeneous coordinates &quot;&quot;&quot;</span>\n",
" <span class=\"k\">raise</span> <span class=\"ne\">NotImplementedError</span>\n",
"\n",
" <span class=\"k\">raise</span> <span class=\"ne\">NotImplementedError</span>\n",
"\n",
" <span class=\"k\">def</span> <span class=\"nf\">predict</span><span class=\"p\">(</span><span class=\"bp\">self</span><span class=\"p\">,</span> <span class=\"n\">x</span><span class=\"p\">):</span>\n",
"<span class=\"w\"> </span><span class=\"sd\">&quot;&quot;&quot; make prediction &quot;&quot;&quot;</span>\n",
" <span class=\"k\">return</span> <span class=\"nb\">int</span><span class=\"p\">(</span><span class=\"n\">np</span><span class=\"o\">.</span><span class=\"n\">dot</span><span class=\"p\">(</span><span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">w</span><span class=\"p\">,</span> <span class=\"p\">[</span><span class=\"mi\">1</span><span class=\"p\">]</span> <span class=\"o\">+</span> <span class=\"n\">x</span><span class=\"p\">))</span>\n",
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"import sys\n",
"sys.path.insert(1, '../')\n",
"from utils.dataset4learners import *\n",
"from LinearClassifier_3 import *\n",
"\n",
"psource(PerceptionLinearLearner)"
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"#### 实现要点\n",
"\n",
"```py\n",
"def learn(self, learning_rate, epochs):\n",
" \"\"\" learning loop \"\"\"\n",
" def loss(example, w, idx_i, idx_t):\n",
" \"\"\" error: difference between estimation and true value \"\"\"\n",
" x = example的齐次坐标表示\n",
" y = w * x,即预测值\n",
" t = 真实值\n",
" return y - t\n",
"\n",
" def update(w, learning_rate, err, X_col, num_examples):\n",
" \"\"\" update weights \"\"\"\n",
" 遍历w[i]:\n",
" w[i] = w[i] - 学习率 * 误差值 * 自变量X[i] / 样本数量)\n",
"\n",
" def homogeneous(num_examples):\n",
" \"\"\" build homogeneous coordinates \"\"\"\n",
" return 齐次坐标表示\n",
"\n",
" X_col = 齐次坐标表示\n",
" for epoch in range(epochs):\n",
" err = []\n",
" # pass over all examples\n",
" for example in self.examples:\n",
" err.append(loss(example, w, idx_i, idx_t))\n",
"\n",
" # update weights\n",
" update(w, 学习率, err, X_col, 样本数量)\n",
"```"
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"> 注意,Perceptron是一个单层的神经网络,在后面课程中讲授。"
]
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"### 例子\n",
"\n",
"我们将在`iris`数据集上训练感知机。\n",
"\n",
"尽管`BackPropagationLearner`使用的是整数索引而不是字符串,我们需要将类名转换成整数。"
]
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"```py\n",
"iris = DataSet(name=\"iris\")\n",
"iris.classes_to_numbers()\n",
"\n",
"perceptron = PerceptionLinearLearner(iris)\n",
"print(perceptron.predict([5, 3, 1, 0.1]))\n",
"```"
]
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"正确的输出是0,这意味着该物品属于第一类,\"setosa\"。注意Perceptron算法并不完美,可能会产生错误的分类。"
]
},
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"id": "c6ab0a90-bf04-497b-9795-31e62155054d",
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"source": [
"## 逻辑回归分类器"
]
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"逻辑回归将感知机采用的硬性阈值函数改为柔性阈值,可以更好地对分界区域的不确定性建模。\n",
"\n",
"### 实现\n"
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"<body>\n",
"<h2></h2>\n",
"\n",
"<div class=\"highlight\"><pre><span></span><span class=\"k\">class</span> <span class=\"nc\">LogisticLinearLeaner</span><span class=\"p\">(</span><span class=\"n\">LinearClassifier</span><span class=\"p\">):</span>\n",
" <span class=\"k\">def</span> <span class=\"fm\">__init__</span><span class=\"p\">(</span><span class=\"bp\">self</span><span class=\"p\">,</span> <span class=\"n\">dataset</span><span class=\"p\">,</span> <span class=\"n\">learning_rate</span><span class=\"o\">=</span><span class=\"mf\">0.01</span><span class=\"p\">,</span> <span class=\"n\">epochs</span><span class=\"o\">=</span><span class=\"mi\">100</span><span class=\"p\">):</span>\n",
" <span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">idx_i</span> <span class=\"o\">=</span> <span class=\"n\">dataset</span><span class=\"o\">.</span><span class=\"n\">inputs</span>\n",
" <span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">idx_t</span> <span class=\"o\">=</span> <span class=\"n\">dataset</span><span class=\"o\">.</span><span class=\"n\">target</span>\n",
" <span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">examples</span> <span class=\"o\">=</span> <span class=\"n\">dataset</span><span class=\"o\">.</span><span class=\"n\">examples</span>\n",
" <span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">num_examples</span> <span class=\"o\">=</span> <span class=\"nb\">len</span><span class=\"p\">(</span><span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">examples</span><span class=\"p\">)</span>\n",
" <span class=\"c1\"># initialize random weights</span>\n",
" <span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">w</span> <span class=\"o\">=</span> <span class=\"n\">random_weights</span><span class=\"p\">(</span><span class=\"n\">min_value</span><span class=\"o\">=-</span><span class=\"mf\">0.5</span><span class=\"p\">,</span> <span class=\"n\">max_value</span><span class=\"o\">=</span><span class=\"mf\">0.5</span><span class=\"p\">,</span> <span class=\"n\">num_weights</span><span class=\"o\">=</span><span class=\"nb\">len</span><span class=\"p\">(</span><span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">idx_i</span><span class=\"p\">)</span> <span class=\"o\">+</span> <span class=\"mi\">1</span><span class=\"p\">)</span>\n",
" <span class=\"c1\"># learning loop</span>\n",
" <span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">learn</span><span class=\"p\">(</span><span class=\"n\">learning_rate</span><span class=\"p\">,</span> <span class=\"n\">epochs</span><span class=\"p\">)</span>\n",
" \n",
" <span class=\"k\">def</span> <span class=\"nf\">learn</span><span class=\"p\">(</span><span class=\"bp\">self</span><span class=\"p\">,</span> <span class=\"n\">learning_rate</span><span class=\"p\">,</span> <span class=\"n\">epochs</span><span class=\"p\">):</span>\n",
"<span class=\"w\"> </span><span class=\"sd\">&quot;&quot;&quot; learning loop &quot;&quot;&quot;</span>\n",
" <span class=\"k\">def</span> <span class=\"nf\">loss</span><span class=\"p\">(</span><span class=\"n\">example</span><span class=\"p\">,</span> <span class=\"n\">w</span><span class=\"p\">,</span> <span class=\"n\">idx_i</span><span class=\"p\">,</span> <span class=\"n\">idx_t</span><span class=\"p\">,</span> <span class=\"n\">h</span><span class=\"p\">):</span>\n",
"<span class=\"w\"> </span><span class=\"sd\">&quot;&quot;&quot; error: difference between estimation and true value &quot;&quot;&quot;</span>\n",
" <span class=\"k\">raise</span> <span class=\"ne\">NotImplementedError</span>\n",
" \n",
" <span class=\"k\">def</span> <span class=\"nf\">update</span><span class=\"p\">(</span><span class=\"n\">w</span><span class=\"p\">,</span> <span class=\"n\">learning_rate</span><span class=\"p\">,</span> <span class=\"n\">err</span><span class=\"p\">,</span> <span class=\"n\">h</span><span class=\"p\">,</span> <span class=\"n\">X_col</span><span class=\"p\">,</span> <span class=\"n\">num_examples</span><span class=\"p\">):</span>\n",
"<span class=\"w\"> </span><span class=\"sd\">&quot;&quot;&quot; update weights &quot;&quot;&quot;</span>\n",
" <span class=\"k\">raise</span> <span class=\"ne\">NotImplementedError</span>\n",
"\n",
" <span class=\"k\">def</span> <span class=\"nf\">homogeneous</span><span class=\"p\">(</span><span class=\"n\">num_examples</span><span class=\"p\">):</span>\n",
"<span class=\"w\"> </span><span class=\"sd\">&quot;&quot;&quot; build homogeneous coordinates &quot;&quot;&quot;</span>\n",
" <span class=\"k\">raise</span> <span class=\"ne\">NotImplementedError</span>\n",
"\n",
" <span class=\"k\">raise</span> <span class=\"ne\">NotImplementedError</span>\n",
"\n",
" <span class=\"k\">def</span> <span class=\"nf\">predict</span><span class=\"p\">(</span><span class=\"bp\">self</span><span class=\"p\">,</span> <span class=\"n\">x</span><span class=\"p\">):</span>\n",
"<span class=\"w\"> </span><span class=\"sd\">&quot;&quot;&quot; make prediction &quot;&quot;&quot;</span>\n",
" <span class=\"k\">return</span> <span class=\"nb\">int</span><span class=\"p\">(</span><span class=\"n\">np</span><span class=\"o\">.</span><span class=\"n\">dot</span><span class=\"p\">(</span><span class=\"bp\">self</span><span class=\"o\">.</span><span class=\"n\">w</span><span class=\"p\">,</span> <span class=\"p\">[</span><span class=\"mi\">1</span><span class=\"p\">]</span> <span class=\"o\">+</span> <span class=\"n\">x</span><span class=\"p\">))</span>\n",
"</pre></div>\n",
"</body>\n",
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"source": [
"psource(LogisticLinearLeaner)"
]
},
{
"cell_type": "markdown",
"id": "64d23b34-7203-4abe-bb3b-b3e65f192d62",
"metadata": {},
"source": [
"#### 实现要点\n",
"\n",
"```py\n",
"def learn(self, learning_rate, epochs):\n",
" \"\"\" learning loop \"\"\"\n",
" def loss(example, w, idx_i, idx_t, h):\n",
" \"\"\" error: difference between estimation and true value \"\"\"\n",
" x = example的齐次坐标表示\n",
" y = Sigmoid(w * x),即预测值\n",
" h.append(Sigmoid().derivative(y)):收集梯度值\n",
" t = 真实值\n",
" return y - t\n",
"\n",
" def update(w, learning_rate, err, h, X_col, num_examples):\n",
" \"\"\" update weights \"\"\"\n",
" 遍历w[i]:\n",
" w[i] = w[i] - 学习率 * 误差值err[i] * 梯度值h[i] / 样本数量)\n",
"\n",
" def homogeneous(num_examples):\n",
" \"\"\" build homogeneous coordinates \"\"\"\n",
" 同感知机\n",
"\n",
" 同感知机\n",
"```"
]
},
{
"cell_type": "markdown",
"id": "34dde5da-d093-4021-ae8b-7a38cd5b11dc",
"metadata": {},
"source": [
"该算法首先为输入变量分配一些随机权重,然后根据计算的误差更新每个变量的权重。最后用更新后的权重进行预测。"
]
},
{
"cell_type": "markdown",
"id": "2b3f1358-fe11-4499-8fc1-f8a7fb6ef826",
"metadata": {
"tags": []
},
"source": [
"```py\n",
"iris = DataSet(name=\"iris\")\n",
"iris.classes_to_numbers()\n",
"\n",
"logisticer = LogisticLinearLeaner(iris)\n",
"print(logisticer.predict([5, 3, 1, 0.1]))\n",
"```"
]
},
{
"cell_type": "markdown",
"id": "b0e066c5-554b-4286-ae5f-1f71dd7b95a8",
"metadata": {
"slideshow": {
"slide_type": "-"
},
"tags": []
},
"source": [
"## 图像分类数据集"
]
},
{
"cell_type": "markdown",
"id": "19b612e3-6ede-4ffa-a9dd-14a0480a2c8f",
"metadata": {
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"source": [
"MNIST数据集是图像分类中广泛使用的数据集之一,但作为基准数据集过于简单。\n",
"\n",
"我们将使用类似但更复杂的Fashion-MNIST数据集"
]
},
{
"cell_type": "code",
"execution_count": 6,
"id": "451140a0-6c93-45e0-8e19-8ffb51099e77",
"metadata": {
"origin_pos": 2,
"tab": [
"pytorch"
]
},
"outputs": [],
"source": [
"%matplotlib inline\n",
"import torch\n",
"import torchvision\n",
"from torch.utils import data\n",
"from torchvision import transforms\n",
"from d2l import torch as d2l\n",
"\n",
"d2l.use_svg_display()"
]
},
{
"cell_type": "markdown",
"id": "b5386450-4cdd-4c05-9524-25505b67f22c",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"通过框架中的内置函数将Fashion-MNIST数据集下载并读取到内存中"
]
},
{
"cell_type": "code",
"execution_count": 8,
"id": "af7b66a6-a2ca-4ec3-981e-8acaf5880cbe",
"metadata": {
"origin_pos": 9,
"tab": [
"pytorch"
]
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Downloading http://fashion-mnist.s3-website.eu-central-1.amazonaws.com/train-images-idx3-ubyte.gz\n",
"Downloading http://fashion-mnist.s3-website.eu-central-1.amazonaws.com/train-images-idx3-ubyte.gz to ../data/FashionMNIST/raw/train-images-idx3-ubyte.gz\n"
]
},
{
"name": "stderr",
"output_type": "stream",
"text": [
"100.0%\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Extracting ../data/FashionMNIST/raw/train-images-idx3-ubyte.gz to ../data/FashionMNIST/raw\n",
"\n",
"Downloading http://fashion-mnist.s3-website.eu-central-1.amazonaws.com/train-labels-idx1-ubyte.gz\n",
"Downloading http://fashion-mnist.s3-website.eu-central-1.amazonaws.com/train-labels-idx1-ubyte.gz to ../data/FashionMNIST/raw/train-labels-idx1-ubyte.gz\n"
]
},
{
"name": "stderr",
"output_type": "stream",
"text": [
"100.0%\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Extracting ../data/FashionMNIST/raw/train-labels-idx1-ubyte.gz to ../data/FashionMNIST/raw\n",
"\n",
"Downloading http://fashion-mnist.s3-website.eu-central-1.amazonaws.com/t10k-images-idx3-ubyte.gz\n",
"Downloading http://fashion-mnist.s3-website.eu-central-1.amazonaws.com/t10k-images-idx3-ubyte.gz to ../data/FashionMNIST/raw/t10k-images-idx3-ubyte.gz\n"
]
},
{
"name": "stderr",
"output_type": "stream",
"text": [
"100.0%\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Extracting ../data/FashionMNIST/raw/t10k-images-idx3-ubyte.gz to ../data/FashionMNIST/raw\n",
"\n",
"Downloading http://fashion-mnist.s3-website.eu-central-1.amazonaws.com/t10k-labels-idx1-ubyte.gz\n",
"Downloading http://fashion-mnist.s3-website.eu-central-1.amazonaws.com/t10k-labels-idx1-ubyte.gz to ../data/FashionMNIST/raw/t10k-labels-idx1-ubyte.gz\n"
]
},
{
"name": "stderr",
"output_type": "stream",
"text": [
"100.0%\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Extracting ../data/FashionMNIST/raw/t10k-labels-idx1-ubyte.gz to ../data/FashionMNIST/raw\n",
"\n"
]
},
{
"data": {
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"source": [
"# 通过ToTensor实例将图像数据从PIL类型变换成32位浮点数格式,\n",
"# 并除以255使得所有像素的数值均在0到1之间\n",
"trans = transforms.ToTensor()\n",
"mnist_train = torchvision.datasets.FashionMNIST(\n",
" root=\"../data\", train=True, transform=trans, download=True)\n",
"mnist_test = torchvision.datasets.FashionMNIST(\n",
" root=\"../data\", train=False, transform=trans, download=True)\n",
"\n",
"len(mnist_train), len(mnist_test)"
]
},
{
"cell_type": "code",
"execution_count": 9,
"id": "e5de50d6-1fe0-407d-87a9-8eec3c6c475d",
"metadata": {
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"tab": [
"pytorch"
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{
"data": {
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"torch.Size([1, 28, 28])"
]
},
"execution_count": 9,
"metadata": {},
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"source": [
"mnist_train[0][0].shape"
]
},
{
"cell_type": "markdown",
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"metadata": {
"slideshow": {
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"source": [
"两个可视化数据集的函数"
]
},
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"cell_type": "code",
"execution_count": 10,
"id": "0557638e-71b8-40ce-95e6-5d61038f1ffc",
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"tab": [
"pytorch"
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"source": [
"def get_fashion_mnist_labels(labels): \n",
" \"\"\"返回Fashion-MNIST数据集的文本标签\"\"\"\n",
" text_labels = ['t-shirt', 'trouser', 'pullover', 'dress', 'coat',\n",
" 'sandal', 'shirt', 'sneaker', 'bag', 'ankle boot']\n",
" return [text_labels[int(i)] for i in labels]\n",
"\n",
"def show_images(imgs, num_rows, num_cols, titles=None, scale=1.5): \n",
" \"\"\"绘制图像列表\"\"\"\n",
" figsize = (num_cols * scale, num_rows * scale)\n",
" _, axes = d2l.plt.subplots(num_rows, num_cols, figsize=figsize)\n",
" axes = axes.flatten()\n",
" for i, (ax, img) in enumerate(zip(axes, imgs)):\n",
" if torch.is_tensor(img):\n",
" ax.imshow(img.numpy()) # 图片张量\n",
" else:\n",
" ax.imshow(img) # PIL图片\n",
" ax.axes.get_xaxis().set_visible(False)\n",
" ax.axes.get_yaxis().set_visible(False)\n",
" if titles:\n",
" ax.set_title(titles[i])\n",
" return axes"
]
},
{
"cell_type": "markdown",
"id": "0c9255c0-c447-4232-a1e8-9cbdd63f2a62",
"metadata": {
"slideshow": {
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}
},
"source": [
"几个样本的图像及其相应的标签"
]
},
{
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"execution_count": 11,
"id": "6bd5a31f-a289-4ab2-9ee5-bbe8322ac216",
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"text/plain": [
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},
"metadata": {},
"output_type": "display_data"
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],
"source": [
"X, y = next(iter(data.DataLoader(mnist_train, batch_size=18)))\n",
"show_images(X.reshape(18, 28, 28), 2, 9, titles=get_fashion_mnist_labels(y));"
]
},
{
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"id": "9ce47a48-d8e3-46a6-8e2b-009c4e299341",
"metadata": {
"slideshow": {
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}
},
"source": [
"读取一小批量数据,大小为`batch_size`"
]
},
{
"cell_type": "code",
"execution_count": 12,
"id": "b15b88d6-d561-4971-9c20-b30d2618da04",
"metadata": {
"origin_pos": 27,
"tab": [
"pytorch"
]
},
"outputs": [
{
"data": {
"text/plain": [
"'20.21 sec'"
]
},
"execution_count": 12,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"batch_size = 256\n",
"\n",
"def get_dataloader_workers(): \n",
" \"\"\"使用4个进程来读取数据\"\"\"\n",
" return 4\n",
"\n",
"train_iter = data.DataLoader(mnist_train, batch_size, shuffle=True,\n",
" num_workers=get_dataloader_workers())\n",
"\n",
"timer = d2l.Timer()\n",
"for X, y in train_iter:\n",
" continue\n",
"f'{timer.stop():.2f} sec'"
]
},
{
"cell_type": "markdown",
"id": "1e0a3486-8788-4a87-b9b9-cb327ba7d2ca",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"定义`load_data_fashion_mnist`函数"
]
},
{
"cell_type": "code",
"execution_count": 13,
"id": "5f88e2a1-88b6-49c3-a8b8-2ac9602a71a8",
"metadata": {
"origin_pos": 33,
"tab": [
"pytorch"
]
},
"outputs": [],
"source": [
"def load_data_fashion_mnist(batch_size, resize=None): \n",
" \"\"\"下载Fashion-MNIST数据集,然后将其加载到内存中\"\"\"\n",
" trans = [transforms.ToTensor()]\n",
" if resize:\n",
" trans.insert(0, transforms.Resize(resize))\n",
" trans = transforms.Compose(trans)\n",
" mnist_train = torchvision.datasets.FashionMNIST(\n",
" root=\"../data\", train=True, transform=trans, download=True)\n",
" mnist_test = torchvision.datasets.FashionMNIST(\n",
" root=\"../data\", train=False, transform=trans, download=True)\n",
" return (data.DataLoader(mnist_train, batch_size, shuffle=True,\n",
" num_workers=get_dataloader_workers()),\n",
" data.DataLoader(mnist_test, batch_size, shuffle=False,\n",
" num_workers=get_dataloader_workers()))"
]
},
{
"cell_type": "code",
"execution_count": 14,
"id": "b60ce5c6-c1e3-4d51-9d2a-d35e114773ed",
"metadata": {
"origin_pos": 33,
"slideshow": {
"slide_type": "slide"
},
"tab": [
"pytorch"
]
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"torch.Size([32, 1, 64, 64]) torch.float32 torch.Size([32]) torch.int64\n"
]
}
],
"source": [
"train_iter, test_iter = load_data_fashion_mnist(32, resize=64)\n",
"for X, y in train_iter:\n",
" print(X.shape, X.dtype, y.shape, y.dtype)\n",
" break"
]
},
{
"cell_type": "markdown",
"id": "2b3bc703-261c-4f28-8b13-10599cdfb648",
"metadata": {
"slideshow": {
"slide_type": "-"
},
"tags": []
},
"source": [
"## softmax回归的从零开始实现"
]
},
{
"cell_type": "markdown",
"id": "461c158e-d492-4138-a1dc-a6dee27856c3",
"metadata": {
"slideshow": {
"slide_type": "-"
}
},
"source": [
"就像我们从零开始实现线性回归一样,你应该知道实现softmax回归的细节"
]
},
{
"cell_type": "code",
"execution_count": 15,
"id": "7c6ea6a5-00d4-4032-8b69-a23295a1c3b3",
"metadata": {
"origin_pos": 4,
"tab": [
"pytorch"
]
},
"outputs": [],
"source": [
"import torch\n",
"from IPython import display\n",
"from d2l import torch as d2l\n",
"\n",
"batch_size = 256\n",
"train_iter, test_iter = d2l.load_data_fashion_mnist(batch_size)"
]
},
{
"cell_type": "markdown",
"id": "79517ad9-cddb-4ee2-9f61-43e0b6bb3341",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"将展平每个图像,把它们看作长度为784的向量。\n",
"因为我们的数据集有10个类别,所以网络输出维度为10"
]
},
{
"cell_type": "code",
"execution_count": 16,
"id": "bf6ec527-910e-42ce-b24c-c72da6fa9c74",
"metadata": {
"origin_pos": 7,
"tab": [
"pytorch"
]
},
"outputs": [],
"source": [
"num_inputs = 784\n",
"num_outputs = 10\n",
"\n",
"W = torch.normal(0, 0.01, size=(num_inputs, num_outputs), requires_grad=True)\n",
"b = torch.zeros(num_outputs, requires_grad=True)"
]
},
{
"cell_type": "markdown",
"id": "2499dc12-833a-4851-b5de-859d86f428c5",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"给定一个矩阵`X`,我们可以对所有元素求和"
]
},
{
"cell_type": "code",
"execution_count": 17,
"id": "e7fbccdf-9d88-4244-963a-33ebe05ba5ae",
"metadata": {
"origin_pos": 10,
"tab": [
"pytorch"
]
},
"outputs": [
{
"data": {
"text/plain": [
"(tensor([[5., 7., 9.]]),\n",
" tensor([[ 6.],\n",
" [15.]]))"
]
},
"execution_count": 17,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"X = torch.tensor([[1.0, 2.0, 3.0], [4.0, 5.0, 6.0]])\n",
"X.sum(0, keepdim=True), X.sum(1, keepdim=True)"
]
},
{
"cell_type": "markdown",
"id": "7338e047-94ed-438d-a0b0-2477692b0c45",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"实现softmax\n",
"\n",
"$$\n",
"\\mathrm{softmax}(\\mathbf{X})_{ij} = \\frac{\\exp(\\mathbf{X}_{ij})}{\\sum_k \\exp(\\mathbf{X}_{ik})}.\n",
"$$"
]
},
{
"cell_type": "code",
"execution_count": 18,
"id": "073aadb5-9a24-44e3-ac4b-3bae84a3a9e2",
"metadata": {
"origin_pos": 14,
"tab": [
"pytorch"
]
},
"outputs": [],
"source": [
"def softmax(X):\n",
" X_exp = torch.exp(X)\n",
" partition = X_exp.sum(1, keepdim=True)\n",
" return X_exp / partition # 广播机制"
]
},
{
"cell_type": "markdown",
"id": "17706f99-24f6-446f-9f4a-a17368170e3f",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"我们将每个元素变成一个非负数。\n",
"此外,依据概率原理,每行总和为1"
]
},
{
"cell_type": "code",
"execution_count": 19,
"id": "2ff371fa-6e82-4540-8c7d-0bba75225e1f",
"metadata": {
"origin_pos": 16,
"tab": [
"pytorch"
]
},
"outputs": [
{
"data": {
"text/plain": [
"(tensor([[0.3532, 0.0347, 0.0805, 0.0395, 0.4921],\n",
" [0.6108, 0.0814, 0.1468, 0.0484, 0.1126]]),\n",
" tensor([1., 1.]))"
]
},
"execution_count": 19,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"X = torch.normal(0, 1, (2, 5))\n",
"X_prob = softmax(X)\n",
"X_prob, X_prob.sum(1)"
]
},
{
"cell_type": "markdown",
"id": "02ba4bf7-0785-4958-afbf-9519f33ed8af",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"实现softmax回归模型"
]
},
{
"cell_type": "code",
"execution_count": 20,
"id": "ec1c7adf-b253-48cb-8abc-395098c3635e",
"metadata": {
"origin_pos": 19,
"tab": [
"pytorch"
]
},
"outputs": [],
"source": [
"def net(X):\n",
" return softmax(torch.matmul(X.reshape((-1, W.shape[0])), W) + b)"
]
},
{
"cell_type": "markdown",
"id": "e1ee288d-3e6e-41de-b4f5-c020e83bd14e",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"创建一个数据样本`y_hat`,其中包含2个样本在3个类别的预测概率,\n",
"以及它们对应的标签`y`。\n",
"使用`y`作为`y_hat`中概率的索引"
]
},
{
"cell_type": "code",
"execution_count": 21,
"id": "83632ade-00af-4692-887f-cd13041c814d",
"metadata": {
"origin_pos": 21,
"tab": [
"pytorch"
]
},
"outputs": [
{
"data": {
"text/plain": [
"tensor([0.1000, 0.5000])"
]
},
"execution_count": 21,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"y = torch.tensor([0, 2]) # 在第二个样本中,第三类是正确的预测\n",
"y_hat = torch.tensor([[0.1, 0.3, 0.6], [0.3, 0.2, 0.5]])\n",
"y_hat[[0, 1], y] # 使用y作为y_hat中概率的索引"
]
},
{
"cell_type": "markdown",
"id": "c40efbc6-376d-4557-8b46-35c6aff4f979",
"metadata": {
"slideshow": {
"slide_type": "-"
}
},
"source": [
"实现交叉熵损失函数"
]
},
{
"cell_type": "code",
"execution_count": 22,
"id": "f070bea1-2b36-402e-828f-29d2446b0c56",
"metadata": {
"origin_pos": 24,
"tab": [
"pytorch"
]
},
"outputs": [
{
"data": {
"text/plain": [
"tensor([2.3026, 0.6931])"
]
},
"execution_count": 22,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"def cross_entropy(y_hat, y):\n",
" \"\"\" 避免低效的for循环 \"\"\"\n",
" return - torch.log(y_hat[range(len(y_hat)), y])\n",
"\n",
"cross_entropy(y_hat, y) # 损失函数,越低越好"
]
},
{
"cell_type": "markdown",
"id": "9374a06e-27ed-42fa-a1c9-0c6d90dd4a48",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"将预测类别与真实`y`元素进行比较"
]
},
{
"cell_type": "code",
"execution_count": 23,
"id": "97a56aa3-f780-4f32-98ca-086d6e1024f0",
"metadata": {
"origin_pos": 29,
"tab": [
"pytorch"
]
},
"outputs": [
{
"data": {
"text/plain": [
"0.5"
]
},
"execution_count": 23,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"def accuracy(y_hat, y): \n",
" \"\"\"计算预测正确的数量\"\"\"\n",
" if len(y_hat.shape) > 1 and y_hat.shape[1] > 1:\n",
" y_hat = y_hat.argmax(axis=1)\n",
" cmp = y_hat.type(y.dtype) == y # 数据类型转成一致\n",
" return float(cmp.type(y.dtype).sum())\n",
"\n",
"accuracy(y_hat, y) / len(y)"
]
},
{
"cell_type": "markdown",
"id": "585af5a4-d317-42ee-a5f1-255a594856fa",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"我们可以评估在任意模型`net`的精度"
]
},
{
"cell_type": "code",
"execution_count": 24,
"id": "540c6f10-7592-4fd3-8221-0ef56f88a0bf",
"metadata": {
"origin_pos": 32,
"tab": [
"pytorch"
]
},
"outputs": [],
"source": [
"def evaluate_accuracy(net, data_iter): \n",
" \"\"\"计算在指定数据集上模型的精度\"\"\"\n",
" if isinstance(net, torch.nn.Module):\n",
" net.eval() # 将模型设置为评估模式\n",
" metric = Accumulator(2) # 正确预测数、预测总数\n",
" with torch.no_grad():\n",
" for X, y in data_iter:\n",
" metric.add(accuracy(net(X), y), y.numel())\n",
" return metric[0] / metric[1]"
]
},
{
"cell_type": "markdown",
"id": "d7593436-0ca0-4fc3-ae2c-7d7311ddb9f6",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"`Accumulator`实例中创建了2个变量,\n",
"分别用于存储正确预测的数量和预测的总数量"
]
},
{
"cell_type": "code",
"execution_count": 25,
"id": "bb38e91c-b8aa-4912-862e-9080a0bbda66",
"metadata": {
"origin_pos": 36,
"tab": [
"pytorch"
]
},
"outputs": [
{
"data": {
"text/plain": [
"0.1004"
]
},
"execution_count": 25,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"class Accumulator: \n",
" \"\"\"在n个变量上累加\"\"\"\n",
" def __init__(self, n):\n",
" self.data = [0.0] * n\n",
"\n",
" def add(self, *args):\n",
" self.data = [a + float(b) for a, b in zip(self.data, args)]\n",
"\n",
" def reset(self):\n",
" self.data = [0.0] * len(self.data)\n",
"\n",
" def __getitem__(self, idx):\n",
" return self.data[idx]\n",
"\n",
"evaluate_accuracy(net, test_iter) # 随机权重初始化,随机猜测应该接近0.1"
]
},
{
"cell_type": "markdown",
"id": "9ca7e9be-2270-481f-b0c9-882b79efed78",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"Softmax回归的训练"
]
},
{
"cell_type": "code",
"execution_count": 26,
"id": "c4c903ea-72eb-49a9-9888-8e8d5fd6f8a6",
"metadata": {
"origin_pos": 39,
"tab": [
"pytorch"
]
},
"outputs": [],
"source": [
"def train_epoch_ch3(net, train_iter, loss, updater): \n",
" \"\"\"训练模型一个迭代周期(定义见第3章)\"\"\"\n",
" if isinstance(net, torch.nn.Module):\n",
" net.train() # 将模型设置为训练模式\n",
" metric = Accumulator(3) # 训练损失总和、训练准确度总和、样本数\n",
" for X, y in train_iter:\n",
" # 计算梯度并更新参数\n",
" y_hat = net(X)\n",
" l = loss(y_hat, y)\n",
" if isinstance(updater, torch.optim.Optimizer):\n",
" # 使用PyTorch内置的优化器和损失函数\n",
" updater.zero_grad()\n",
" l.mean().backward()\n",
" updater.step()\n",
" else: # 使用定制的优化器和损失函数\n",
" l.sum().backward()\n",
" updater(X.shape[0])\n",
" metric.add(float(l.sum()), accuracy(y_hat, y), y.numel())\n",
" # 返回训练损失和训练精度\n",
" return metric[0] / metric[2], metric[1] / metric[2]"
]
},
{
"cell_type": "markdown",
"id": "dd06ef05-3914-4ecd-ba5e-59c4fea740c0",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"定义一个在动画中绘制数据的实用程序类"
]
},
{
"cell_type": "code",
"execution_count": 27,
"id": "3ecf8ca6-1797-497d-abc3-867a591bf464",
"metadata": {
"origin_pos": 42,
"tab": [
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]
},
"outputs": [],
"source": [
"class Animator: \n",
" \"\"\"在动画中绘制数据\"\"\"\n",
" def __init__(self, xlabel=None, ylabel=None, legend=None, xlim=None,\n",
" ylim=None, xscale='linear', yscale='linear',\n",
" fmts=('-', 'm--', 'g-.', 'r:'), nrows=1, ncols=1,\n",
" figsize=(3.5, 2.5)):\n",
" if legend is None:\n",
" legend = [] # 增量地绘制多条线\n",
" d2l.use_svg_display()\n",
" self.fig, self.axes = d2l.plt.subplots(nrows, ncols, figsize=figsize)\n",
" if nrows * ncols == 1:\n",
" self.axes = [self.axes, ]\n",
" # 使用lambda函数捕获参数\n",
" self.config_axes = lambda: d2l.set_axes(\n",
" self.axes[0], xlabel, ylabel, xlim, ylim, xscale, yscale, legend)\n",
" self.X, self.Y, self.fmts = None, None, fmts\n",
"\n",
" def add(self, x, y):\n",
" # 向图表中添加多个数据点\n",
" if not hasattr(y, \"__len__\"):\n",
" y = [y]\n",
" n = len(y)\n",
" if not hasattr(x, \"__len__\"):\n",
" x = [x] * n\n",
" if not self.X:\n",
" self.X = [[] for _ in range(n)]\n",
" if not self.Y:\n",
" self.Y = [[] for _ in range(n)]\n",
" for i, (a, b) in enumerate(zip(x, y)):\n",
" if a is not None and b is not None:\n",
" self.X[i].append(a)\n",
" self.Y[i].append(b)\n",
" self.axes[0].cla()\n",
" for x, y, fmt in zip(self.X, self.Y, self.fmts):\n",
" self.axes[0].plot(x, y, fmt)\n",
" self.config_axes()\n",
" display.display(self.fig)\n",
" display.clear_output(wait=True)"
]
},
{
"cell_type": "markdown",
"id": "91290f6c-081c-430f-8563-73166defe322",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"训练函数"
]
},
{
"cell_type": "code",
"execution_count": 28,
"id": "500cf101-f3cb-44c5-abc6-bbfb770e7953",
"metadata": {
"origin_pos": 44,
"tab": [
"pytorch"
]
},
"outputs": [],
"source": [
"def train_ch3(net, train_iter, test_iter, loss, num_epochs, updater): \n",
" \"\"\"训练模型(定义见第3章)\"\"\"\n",
" animator = Animator(xlabel='epoch', xlim=[1, num_epochs], ylim=[0.3, 0.9],\n",
" legend=['train loss', 'train acc', 'test acc'])\n",
" for epoch in range(num_epochs):\n",
" train_metrics = train_epoch_ch3(net, train_iter, loss, updater)\n",
" test_acc = evaluate_accuracy(net, test_iter)\n",
" animator.add(epoch + 1, train_metrics + (test_acc,))\n",
" train_loss, train_acc = train_metrics\n",
" assert train_loss < 0.5, train_loss\n",
" assert train_acc <= 1 and train_acc > 0.7, train_acc\n",
" assert test_acc <= 1 and test_acc > 0.7, test_acc"
]
},
{
"cell_type": "markdown",
"id": "09e83970-88ed-4d77-a10a-92fad6a89449",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"小批量随机梯度下降来优化模型的损失函数"
]
},
{
"cell_type": "code",
"execution_count": 29,
"id": "ed05114c-e815-44c4-bcce-10880f11286a",
"metadata": {
"origin_pos": 46,
"tab": [
"pytorch"
]
},
"outputs": [],
"source": [
"lr = 0.1\n",
"\n",
"def updater(batch_size):\n",
" return d2l.sgd([W, b], lr, batch_size)"
]
},
{
"cell_type": "markdown",
"id": "6e153647-c2d1-4497-a261-42dfc29ccfd9",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"训练模型10个迭代周期"
]
},
{
"cell_type": "code",
"execution_count": 30,
"id": "cc4149fd-a083-4a50-a164-d71513ea5edb",
"metadata": {
"origin_pos": 49,
"tab": [
"pytorch"
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},
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],
"source": [
"num_epochs = 10\n",
"train_ch3(net, train_iter, test_iter, cross_entropy, num_epochs, updater)"
]
},
{
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"id": "2ec84ab6-8482-46a9-ab68-522f2faba21c",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"对图像进行分类预测"
]
},
{
"cell_type": "code",
"execution_count": 31,
"id": "f5909439-a31c-4ade-aab8-5bb3edb9fa23",
"metadata": {
"origin_pos": 51,
"tab": [
"pytorch"
]
},
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"text/plain": [
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]
},
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}
],
"source": [
"def predict_ch3(net, test_iter, n=8): \n",
" \"\"\"预测标签(定义见第3章)\"\"\"\n",
" for X, y in test_iter:\n",
" break\n",
" trues = d2l.get_fashion_mnist_labels(y)\n",
" preds = d2l.get_fashion_mnist_labels(net(X).argmax(axis=1))\n",
" titles = [true +'\\n' + pred for true, pred in zip(trues, preds)]\n",
" d2l.show_images(\n",
" X[0:n].reshape((n, 28, 28)), 1, n, titles=titles[0:n])\n",
"\n",
"predict_ch3(net, test_iter)"
]
},
{
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"id": "fb05ae93-ca43-4978-b77b-cca182c45c8f",
"metadata": {
"slideshow": {
"slide_type": "-"
},
"tags": []
},
"source": [
"## softmax回归的简洁实现"
]
},
{
"cell_type": "markdown",
"id": "a7da7eb8-6bad-4d17-83a7-24ec09779ef0",
"metadata": {
"slideshow": {
"slide_type": "-"
}
},
"source": [
"通过深度学习框架的高级API能够使实现softmax回归变得更加容易"
]
},
{
"cell_type": "code",
"execution_count": 32,
"id": "b598a5ff-1618-4bc3-a8aa-c627a3d3caa7",
"metadata": {
"origin_pos": 4,
"tab": [
"pytorch"
]
},
"outputs": [],
"source": [
"import torch\n",
"from torch import nn\n",
"from d2l import torch as d2l\n",
"\n",
"batch_size = 256\n",
"train_iter, test_iter = d2l.load_data_fashion_mnist(batch_size)"
]
},
{
"cell_type": "markdown",
"id": "dd341874-7652-4afe-aa0a-41207311318f",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"Softmax回归的输出层是一个全连接层"
]
},
{
"cell_type": "code",
"execution_count": 33,
"id": "ee566c3d-2669-4149-bdcb-d9832ed4c4d5",
"metadata": {
"origin_pos": 7,
"tab": [
"pytorch"
]
},
"outputs": [],
"source": [
"# PyTorch不会隐式地调整输入的形状。因此,\n",
"# 我们在线性层前定义了展平层(flatten),来调整网络输入的形状\n",
"net = nn.Sequential(nn.Flatten(), nn.Linear(784, 10))\n",
"\n",
"def init_weights(m):\n",
" if type(m) == nn.Linear:\n",
" nn.init.normal_(m.weight, std=0.01)\n",
"\n",
"net.apply(init_weights);"
]
},
{
"cell_type": "markdown",
"id": "1330ec1d-3c66-46a0-8422-948553a33c41",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"在交叉熵损失函数中传递未规范化的预测,并同时计算softmax及其对数"
]
},
{
"cell_type": "code",
"execution_count": 34,
"id": "fcac843e-7436-4e88-bdf3-480bdfa12f26",
"metadata": {
"origin_pos": 11,
"tab": [
"pytorch"
]
},
"outputs": [],
"source": [
"loss = nn.CrossEntropyLoss(reduction='none')"
]
},
{
"cell_type": "markdown",
"id": "1c7344bf-3aa5-4a19-8b25-b0296f9e238d",
"metadata": {
"slideshow": {
"slide_type": "-"
}
},
"source": [
"使用学习率为0.1的小批量随机梯度下降作为优化算法"
]
},
{
"cell_type": "code",
"execution_count": 35,
"id": "3c5df7de-6a41-4069-bab3-3b518da1f30f",
"metadata": {
"origin_pos": 15,
"tab": [
"pytorch"
]
},
"outputs": [],
"source": [
"trainer = torch.optim.SGD(net.parameters(), lr=0.1)"
]
},
{
"cell_type": "markdown",
"id": "eef015d8-1fbc-4dd1-b1c0-5bbb46ec6d34",
"metadata": {
"slideshow": {
"slide_type": "slide"
}
},
"source": [
"调用\n",
"之前\n",
"定义的训练函数来训练模型"
]
},
{
"cell_type": "code",
"execution_count": 36,
"id": "2b28c827-05cd-4c4b-9dd7-db27d8067a27",
"metadata": {
"origin_pos": 18,
"tab": [
"pytorch"
],
"tags": []
},
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],
"source": [
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"d2l.train_ch3(net, train_iter, test_iter, loss, num_epochs, trainer)"
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