{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "YnAtHwhmmGOh",
    "outputId": "9c2fd82f-fe05-4f0f-cd17-1923e9307495",
    "slideshow": {
     "slide_type": "skip"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Collecting git+https://github.com/d2l-ai/d2l-zh@release\n",
      "  Cloning https://github.com/d2l-ai/d2l-zh (to revision release) to /tmp/pip-req-build-rwrn0sr4\n",
      "  Running command git clone -q https://github.com/d2l-ai/d2l-zh /tmp/pip-req-build-rwrn0sr4\n",
      "  Running command git checkout -b release --track origin/release\n",
      "  Switched to a new branch 'release'\n",
      "  Branch 'release' set up to track remote branch 'release' from 'origin'.\n",
      "  Running command git submodule update --init --recursive -q\n",
      "Requirement already satisfied: jupyter in /usr/local/lib/python3.7/dist-packages (from d2l==2.0.0b0) (1.0.0)\n",
      "Requirement already satisfied: numpy in /usr/local/lib/python3.7/dist-packages (from d2l==2.0.0b0) (1.19.5)\n",
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      "Requirement already satisfied: webencodings in /usr/local/lib/python3.7/dist-packages (from bleach->nbconvert->jupyter->d2l==2.0.0b0) (0.5.1)\n",
      "Requirement already satisfied: pytz>=2017.2 in /usr/local/lib/python3.7/dist-packages (from pandas->d2l==2.0.0b0) (2018.9)\n",
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      "Requirement already satisfied: chardet<4,>=3.0.2 in /usr/local/lib/python3.7/dist-packages (from requests->d2l==2.0.0b0) (3.0.4)\n",
      "Requirement already satisfied: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in /usr/local/lib/python3.7/dist-packages (from requests->d2l==2.0.0b0) (1.24.3)\n",
      "Requirement already satisfied: certifi>=2017.4.17 in /usr/local/lib/python3.7/dist-packages (from requests->d2l==2.0.0b0) (2021.10.8)\n",
      "Requirement already satisfied: idna<3,>=2.5 in /usr/local/lib/python3.7/dist-packages (from requests->d2l==2.0.0b0) (2.10)\n",
      "Building wheels for collected packages: d2l\n",
      "  Building wheel for d2l (setup.py) ... \u001b[?25l\u001b[?25hdone\n",
      "  Created wheel for d2l: filename=d2l-2.0.0b0-py3-none-any.whl size=80071 sha256=52bdc5edc13a6233bf007431cd81aac7f01ddffc0b2e0a61eeae9f9a17c5c9e1\n",
      "  Stored in directory: /tmp/pip-ephem-wheel-cache-9zyqtm5h/wheels/73/f4/42/d2b85ca46d85a241d6aa57c1c24027de2d2258202bb67945f9\n",
      "Successfully built d2l\n",
      "Installing collected packages: d2l\n",
      "Successfully installed d2l-2.0.0b0\n"
     ]
    }
   ],
   "source": [
    "!pip install git+https://github.com/d2l-ai/d2l-zh@release  # installing d2l\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "id": "3J6COHAcmGOj",
    "origin_pos": 0,
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "# 网络中的网络（NiN）\n",
    "\n",
    "## (**NiN块结构**)\n",
    "\n",
    "![对比 VGG 和 NiN 及它们的块之间主要架构差异。](http://d2l.ai/_images/nin.svg)\n",
    ":width:`600px`\n",
    ":label:`fig_nin`\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "id": "icjYVLrqmGOk",
    "origin_pos": 2,
    "slideshow": {
     "slide_type": "slide"
    },
    "tab": [
     "pytorch"
    ]
   },
   "outputs": [],
   "source": [
    "import torch\n",
    "from torch import nn\n",
    "from d2l import torch as d2l\n",
    "\n",
    "#定义NiN块\n",
    "def nin_block(in_channels, out_channels, kernel_size, strides, padding):\n",
    "    return nn.Sequential(\n",
    "        nn.Conv2d(in_channels, out_channels, kernel_size, strides, padding),\n",
    "        nn.ReLU(),\n",
    "        nn.Conv2d(out_channels, out_channels, kernel_size=1), nn.ReLU(),\n",
    "        nn.Conv2d(out_channels, out_channels, kernel_size=1), nn.ReLU())"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "id": "m76Gv4E2mGOl",
    "origin_pos": 4,
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## [**NiN模型**]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "id": "ZM95zdrnmGOm",
    "origin_pos": 6,
    "slideshow": {
     "slide_type": "-"
    },
    "tab": [
     "pytorch"
    ]
   },
   "outputs": [],
   "source": [
    "net = nn.Sequential(\n",
    "    nin_block(1, 96, kernel_size=11, strides=4, padding=0),\n",
    "    nn.MaxPool2d(3, stride=2),\n",
    "    nin_block(96, 256, kernel_size=5, strides=1, padding=2),\n",
    "    nn.MaxPool2d(3, stride=2),\n",
    "    nin_block(256, 384, kernel_size=3, strides=1, padding=1),\n",
    "    nn.MaxPool2d(3, stride=2),\n",
    "    nn.Dropout(0.5),\n",
    "    # 标签类别数是10\n",
    "    nin_block(384, 10, kernel_size=3, strides=1, padding=1),\n",
    "    nn.AdaptiveAvgPool2d((1, 1)),       #全局平均池化，高宽都变成1\n",
    "    # 将四维的输出转成二维的输出，其形状为(批量大小,10)\n",
    "    nn.Flatten())"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "id": "qpeUzjQ5mGOn",
    "origin_pos": 8,
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "**demo测试，查看每个块的输出情况**\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "jOu7BZpsmGOo",
    "origin_pos": 10,
    "outputId": "80275b87-d88b-4d17-fbc1-90bf1dc46241",
    "slideshow": {
     "slide_type": "-"
    },
    "tab": [
     "pytorch"
    ]
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Sequential output shape:\t torch.Size([1, 96, 54, 54])\n",
      "MaxPool2d output shape:\t torch.Size([1, 96, 26, 26])\n",
      "Sequential output shape:\t torch.Size([1, 256, 26, 26])\n",
      "MaxPool2d output shape:\t torch.Size([1, 256, 12, 12])\n",
      "Sequential output shape:\t torch.Size([1, 384, 12, 12])\n",
      "MaxPool2d output shape:\t torch.Size([1, 384, 5, 5])\n",
      "Dropout output shape:\t torch.Size([1, 384, 5, 5])\n",
      "Sequential output shape:\t torch.Size([1, 10, 5, 5])\n",
      "AdaptiveAvgPool2d output shape:\t torch.Size([1, 10, 1, 1])\n",
      "Flatten output shape:\t torch.Size([1, 10])\n"
     ]
    }
   ],
   "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)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "id": "dsBcacGnmGOq",
    "origin_pos": 12,
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "**训练模型**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/",
     "height": 261
    },
    "id": "ERZoQ6v-mGOr",
    "origin_pos": 13,
    "outputId": "6b85b5ef-f4f3-4195-bb5c-0ad95998bfd0",
    "slideshow": {
     "slide_type": "-"
    },
    "tab": [
     "pytorch"
    ]
   },
   "outputs": [
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       "     <!-- test acc -->\n",
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       " <defs>\n",
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       "</svg>\n"
      ],
      "text/plain": [
       "<Figure size 252x180 with 1 Axes>"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "lr, num_epochs, batch_size = 0.1, 10, 128\n",
    "train_iter, test_iter = d2l.load_data_fashion_mnist(batch_size, resize=224)\n",
    "d2l.train_ch6(net, train_iter, test_iter, num_epochs, lr, d2l.try_gpu())"
   ]
  }
 ],
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