lab-09_1_mnist_softmax.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Lab 10 MNIST and softmax\n",
    "import torch\n",
    "import torchvision.datasets as dsets\n",
    "import torchvision.transforms as transforms\n",
    "import random"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "device = 'cuda' if torch.cuda.is_available() else 'cpu'\n",
    "\n",
    "# for reproducibility\n",
    "random.seed(777)\n",
    "torch.manual_seed(777)\n",
    "if device == 'cuda':\n",
    "    torch.cuda.manual_seed_all(777)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "# parameters\n",
    "learning_rate = 0.001\n",
    "training_epochs = 15\n",
    "batch_size = 100"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "# MNIST dataset\n",
    "mnist_train = dsets.MNIST(root='MNIST_data/',\n",
    "                          train=True,\n",
    "                          transform=transforms.ToTensor(),\n",
    "                          download=True)\n",
    "\n",
    "mnist_test = dsets.MNIST(root='MNIST_data/',\n",
    "                         train=False,\n",
    "                         transform=transforms.ToTensor(),\n",
    "                         download=True)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": [
    "# dataset loader\n",
    "data_loader = torch.utils.data.DataLoader(dataset=mnist_train,\n",
    "                                          batch_size=batch_size,\n",
    "                                          shuffle=True,\n",
    "                                          drop_last=True)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "# MNIST data image of shape 28 * 28 = 784\n",
    "linear = torch.nn.Linear(784, 10, bias=True).to(device)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Parameter containing:\n",
       "tensor([[ 0.1816, -0.3203,  0.7464,  ..., -1.1073, -0.9288,  0.0237],\n",
       "        [-0.3739, -0.1353, -1.4771,  ..., -1.0704, -0.2870, -0.8190],\n",
       "        [ 0.6629, -0.8928, -0.1996,  ..., -0.3233, -0.2469, -0.0439],\n",
       "        ...,\n",
       "        [-0.0205,  0.7921,  1.6696,  ...,  0.9601, -1.5459,  1.4929],\n",
       "        [-0.5019, -1.0087,  0.7673,  ...,  1.3801, -0.5147,  2.4057],\n",
       "        [-0.8006,  0.9329,  1.3498,  ..., -0.0187,  1.4246, -0.3995]],\n",
       "       device='cuda:0', requires_grad=True)"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# Initialization\n",
    "torch.nn.init.normal_(linear.weight)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [],
   "source": [
    "# define cost/loss & optimizer\n",
    "criterion = torch.nn.CrossEntropyLoss().to(device)    # Softmax is internally computed.\n",
    "optimizer = torch.optim.Adam(linear.parameters(), lr=learning_rate)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Epoch: 0001 cost = 4.848181248\n",
      "Epoch: 0002 cost = 1.464641452\n",
      "Epoch: 0003 cost = 0.977406502\n",
      "Epoch: 0004 cost = 0.790303528\n",
      "Epoch: 0005 cost = 0.686833322\n",
      "Epoch: 0006 cost = 0.618483305\n",
      "Epoch: 0007 cost = 0.568978667\n",
      "Epoch: 0008 cost = 0.531290889\n",
      "Epoch: 0009 cost = 0.501056492\n",
      "Epoch: 0010 cost = 0.476258427\n",
      "Epoch: 0011 cost = 0.455025405\n",
      "Epoch: 0012 cost = 0.437031567\n",
      "Epoch: 0013 cost = 0.421489984\n",
      "Epoch: 0014 cost = 0.408599794\n",
      "Epoch: 0015 cost = 0.396514893\n",
      "Learning finished\n"
     ]
    }
   ],
   "source": [
    "total_batch = len(data_loader)\n",
    "for epoch in range(training_epochs):\n",
    "    avg_cost = 0\n",
    "\n",
    "    for X, Y in data_loader:\n",
    "        # reshape input image into [batch_size by 784]\n",
    "        # label is not one-hot encoded\n",
    "        X = X.view(-1, 28 * 28).to(device)\n",
    "        Y = Y.to(device)\n",
    "\n",
    "        optimizer.zero_grad()\n",
    "        hypothesis = linear(X)\n",
    "        cost = criterion(hypothesis, Y)\n",
    "        cost.backward()\n",
    "        optimizer.step()\n",
    "\n",
    "        avg_cost += cost / total_batch\n",
    "\n",
    "    print('Epoch:', '%04d' % (epoch + 1), 'cost =', '{:.9f}'.format(avg_cost))\n",
    "\n",
    "print('Learning finished')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Accuracy: 0.8944000005722046\n",
      "Label:  8\n",
      "Prediction:  8\n"
     ]
    }
   ],
   "source": [
    "# Test the model using test sets\n",
    "with torch.no_grad():\n",
    "    X_test = mnist_test.test_data.view(-1, 28 * 28).float().to(device)\n",
    "    Y_test = mnist_test.test_labels.to(device)\n",
    "\n",
    "    prediction = linear(X_test)\n",
    "    correct_prediction = torch.argmax(prediction, 1) == Y_test\n",
    "    accuracy = correct_prediction.float().mean()\n",
    "    print('Accuracy:', accuracy.item())\n",
    "\n",
    "    # Get one and predict\n",
    "    r = random.randint(0, len(mnist_test) - 1)\n",
    "    X_single_data = mnist_test.test_data[r:r + 1].view(-1, 28 * 28).float().to(device)\n",
    "    Y_single_data = mnist_test.test_labels[r:r + 1].to(device)\n",
    "\n",
    "    print('Label: ', Y_single_data.item())\n",
    "    single_prediction = linear(X_single_data)\n",
    "    print('Prediction: ', torch.argmax(single_prediction, 1).item())"
   ]
  }
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