{ "cells": [ { "cell_type": "markdown", "metadata": { "slideshow": { "slide_type": "slide" } }, "source": [ "# Networks Using Blocks (VGG)" ] }, { "cell_type": "code", "execution_count": 1, "metadata": { "ExecuteTime": { "end_time": "2019-07-03T22:21:55.309728Z", "start_time": "2019-07-03T22:21:51.994279Z" } }, "outputs": [], "source": [ "import d2l\n", "from mxnet import gluon, np, npx\n", "from mxnet.gluon import nn\n", "npx.set_np()\n", "\n", "train_iter, test_iter = d2l.load_data_fashion_mnist(\n", " batch_size=128, resize=224)" ] }, { "cell_type": "markdown", "metadata": { "slideshow": { "slide_type": "slide" } }, "source": [ "VGG block" ] }, { "cell_type": "code", "execution_count": 2, "metadata": { "ExecuteTime": { "end_time": "2019-07-03T22:21:55.320094Z", "start_time": "2019-07-03T22:21:55.314113Z" }, "attributes": { "classes": [], "id": "", "n": "1" } }, "outputs": [], "source": [ "def vgg_block(num_convs, num_channels):\n", " blk = nn.Sequential()\n", " for _ in range(num_convs):\n", " blk.add(nn.Conv2D(num_channels, kernel_size=3,\n", " padding=1, activation='relu'))\n", " blk.add(nn.MaxPool2D(pool_size=2, strides=2))\n", " return blk" ] }, { "cell_type": "markdown", "metadata": { "slideshow": { "slide_type": "slide" } }, "source": [ "The model" ] }, { "cell_type": "code", "execution_count": 3, "metadata": { "ExecuteTime": { "end_time": "2019-07-03T22:21:55.336383Z", "start_time": "2019-07-03T22:21:55.322439Z" }, "attributes": { "classes": [], "id": "", "n": "3" } }, "outputs": [], "source": [ "conv_arch = ((1, 64), (1, 128), (2, 256), (2, 512), (2, 512))\n", "\n", "def vgg(conv_arch):\n", " net = nn.Sequential()\n", " # The convolutional layer part\n", " for (num_convs, num_channels) in conv_arch:\n", " net.add(vgg_block(num_convs, num_channels))\n", " # The fully connected layer part\n", " net.add(nn.Dense(4096, activation='relu'), nn.Dropout(0.5),\n", " nn.Dense(4096, activation='relu'), nn.Dropout(0.5),\n", " nn.Dense(10))\n", " return net\n", "\n", "net = vgg(conv_arch)" ] }, { "cell_type": "markdown", "metadata": { "slideshow": { "slide_type": "slide" } }, "source": [ "Training with narrow version" ] }, { "cell_type": "code", "execution_count": 4, "metadata": { "ExecuteTime": { "end_time": "2019-07-03T22:28:14.142303Z", "start_time": "2019-07-03T22:21:55.338438Z" }, "attributes": { "classes": [], "id": "", "n": "5" }, "scrolled": true }, "outputs": [ { "name": "stdout", "output_type": "stream", "text": [ "loss 0.177, train acc 0.935, test acc 0.925\n", "9350.4 exampes/sec on gpu(0)\n" ] }, { "data": { "image/svg+xml": [ "<?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n", "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\"\n", " \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n", "<!-- Created with matplotlib (https://matplotlib.org/) -->\n", "<svg height=\"184.15625pt\" version=\"1.1\" viewBox=\"0 0 238.965625 184.15625\" width=\"238.965625pt\" xmlns=\"http://www.w3.org/2000/svg\" 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