{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "'''\n",
    "A Convolutional Network implementation example using TensorFlow library.\n",
    "This example is using the MNIST database of handwritten digits\n",
    "(http://yann.lecun.com/exdb/mnist/)\n",
    "\n",
    "Author: Aymeric Damien\n",
    "Project: https://github.com/aymericdamien/TensorFlow-Examples/\n",
    "'''"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Extracting /tmp/data/train-images-idx3-ubyte.gz\n",
      "Extracting /tmp/data/train-labels-idx1-ubyte.gz\n",
      "Extracting /tmp/data/t10k-images-idx3-ubyte.gz\n",
      "Extracting /tmp/data/t10k-labels-idx1-ubyte.gz\n"
     ]
    }
   ],
   "source": [
    "import tensorflow as tf\n",
    "\n",
    "# Import MNIST data\n",
    "from tensorflow.examples.tutorials.mnist import input_data\n",
    "mnist = input_data.read_data_sets(\"/tmp/data/\", one_hot=True)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# Parameters\n",
    "learning_rate = 0.001\n",
    "training_iters = 200000\n",
    "batch_size = 128\n",
    "display_step = 10\n",
    "\n",
    "# Network Parameters\n",
    "n_input = 784 # MNIST data input (img shape: 28*28)\n",
    "n_classes = 10 # MNIST total classes (0-9 digits)\n",
    "dropout = 0.75 # Dropout, probability to keep units\n",
    "\n",
    "# tf Graph input\n",
    "x = tf.placeholder(tf.float32, [None, n_input])\n",
    "y = tf.placeholder(tf.float32, [None, n_classes])\n",
    "keep_prob = tf.placeholder(tf.float32) #dropout (keep probability)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# Create some wrappers for simplicity\n",
    "def conv2d(x, W, b, strides=1):\n",
    "    # Conv2D wrapper, with bias and relu activation\n",
    "    x = tf.nn.conv2d(x, W, strides=[1, strides, strides, 1], padding='SAME')\n",
    "    x = tf.nn.bias_add(x, b)\n",
    "    return tf.nn.relu(x)\n",
    "\n",
    "\n",
    "def maxpool2d(x, k=2):\n",
    "    # MaxPool2D wrapper\n",
    "    return tf.nn.max_pool(x, ksize=[1, k, k, 1], strides=[1, k, k, 1],\n",
    "                          padding='SAME')\n",
    "\n",
    "\n",
    "# Create model\n",
    "def conv_net(x, weights, biases, dropout):\n",
    "    # Reshape input picture\n",
    "    x = tf.reshape(x, shape=[-1, 28, 28, 1])\n",
    "\n",
    "    # Convolution Layer\n",
    "    conv1 = conv2d(x, weights['wc1'], biases['bc1'])\n",
    "    # Max Pooling (down-sampling)\n",
    "    conv1 = maxpool2d(conv1, k=2)\n",
    "\n",
    "    # Convolution Layer\n",
    "    conv2 = conv2d(conv1, weights['wc2'], biases['bc2'])\n",
    "    # Max Pooling (down-sampling)\n",
    "    conv2 = maxpool2d(conv2, k=2)\n",
    "\n",
    "    # Fully connected layer\n",
    "    # Reshape conv2 output to fit fully connected layer input\n",
    "    fc1 = tf.reshape(conv2, [-1, weights['wd1'].get_shape().as_list()[0]])\n",
    "    fc1 = tf.add(tf.matmul(fc1, weights['wd1']), biases['bd1'])\n",
    "    fc1 = tf.nn.relu(fc1)\n",
    "    # Apply Dropout\n",
    "    fc1 = tf.nn.dropout(fc1, dropout)\n",
    "\n",
    "    # Output, class prediction\n",
    "    out = tf.add(tf.matmul(fc1, weights['out']), biases['out'])\n",
    "    return out"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# Store layers weight & bias\n",
    "weights = {\n",
    "    # 5x5 conv, 1 input, 32 outputs\n",
    "    'wc1': tf.Variable(tf.random_normal([5, 5, 1, 32])),\n",
    "    # 5x5 conv, 32 inputs, 64 outputs\n",
    "    'wc2': tf.Variable(tf.random_normal([5, 5, 32, 64])),\n",
    "    # fully connected, 7*7*64 inputs, 1024 outputs\n",
    "    'wd1': tf.Variable(tf.random_normal([7*7*64, 1024])),\n",
    "    # 1024 inputs, 10 outputs (class prediction)\n",
    "    'out': tf.Variable(tf.random_normal([1024, n_classes]))\n",
    "}\n",
    "\n",
    "biases = {\n",
    "    'bc1': tf.Variable(tf.random_normal([32])),\n",
    "    'bc2': tf.Variable(tf.random_normal([64])),\n",
    "    'bd1': tf.Variable(tf.random_normal([1024])),\n",
    "    'out': tf.Variable(tf.random_normal([n_classes]))\n",
    "}\n",
    "\n",
    "# Construct model\n",
    "pred = conv_net(x, weights, biases, keep_prob)\n",
    "\n",
    "# Define loss and optimizer\n",
    "cost = tf.reduce_mean(tf.nn.softmax_cross_entropy_with_logits(pred, y))\n",
    "optimizer = tf.train.AdamOptimizer(learning_rate=learning_rate).minimize(cost)\n",
    "\n",
    "# Evaluate model\n",
    "correct_pred = tf.equal(tf.argmax(pred, 1), tf.argmax(y, 1))\n",
    "accuracy = tf.reduce_mean(tf.cast(correct_pred, tf.float32))\n",
    "\n",
    "# Initializing the variables\n",
    "init = tf.global_variables_initializer()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Iter 1280, Minibatch Loss= 17231.589844, Training Accuracy= 0.25000\n",
      "Iter 2560, Minibatch Loss= 10580.260742, Training Accuracy= 0.54688\n",
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      "Iter 181760, Minibatch Loss= 601.268799, Training Accuracy= 0.93750\n",
      "Iter 183040, Minibatch Loss= 59.850044, Training Accuracy= 0.97656\n",
      "Iter 184320, Minibatch Loss= 145.267883, Training Accuracy= 0.96875\n",
      "Iter 185600, Minibatch Loss= 24.205322, Training Accuracy= 0.99219\n",
      "Iter 186880, Minibatch Loss= 51.866646, Training Accuracy= 0.98438\n",
      "Iter 188160, Minibatch Loss= 166.911987, Training Accuracy= 0.96875\n",
      "Iter 189440, Minibatch Loss= 32.308147, Training Accuracy= 0.98438\n",
      "Iter 190720, Minibatch Loss= 514.898071, Training Accuracy= 0.92188\n",
      "Iter 192000, Minibatch Loss= 146.610031, Training Accuracy= 0.98438\n",
      "Iter 193280, Minibatch Loss= 23.939758, Training Accuracy= 0.99219\n",
      "Iter 194560, Minibatch Loss= 224.806641, Training Accuracy= 0.97656\n",
      "Iter 195840, Minibatch Loss= 71.935089, Training Accuracy= 0.98438\n",
      "Iter 197120, Minibatch Loss= 182.021210, Training Accuracy= 0.96875\n",
      "Iter 198400, Minibatch Loss= 125.573784, Training Accuracy= 0.96875\n",
      "Iter 199680, Minibatch Loss= 122.506104, Training Accuracy= 0.96875\n",
      "Optimization Finished!\n",
      "Testing Accuracy: 0.972656\n"
     ]
    }
   ],
   "source": [
    "# Launch the graph\n",
    "with tf.Session() as sess:\n",
    "    sess.run(init)\n",
    "    step = 1\n",
    "    # Keep training until reach max iterations\n",
    "    while step * batch_size < training_iters:\n",
    "        batch_x, batch_y = mnist.train.next_batch(batch_size)\n",
    "        # Run optimization op (backprop)\n",
    "        sess.run(optimizer, feed_dict={x: batch_x, y: batch_y,\n",
    "                                       keep_prob: dropout})\n",
    "        if step % display_step == 0:\n",
    "            # Calculate batch loss and accuracy\n",
    "            loss, acc = sess.run([cost, accuracy], feed_dict={x: batch_x,\n",
    "                                                              y: batch_y,\n",
    "                                                              keep_prob: 1.})\n",
    "            print \"Iter \" + str(step*batch_size) + \", Minibatch Loss= \" + \\\n",
    "                  \"{:.6f}\".format(loss) + \", Training Accuracy= \" + \\\n",
    "                  \"{:.5f}\".format(acc)\n",
    "        step += 1\n",
    "    print \"Optimization Finished!\"\n",
    "\n",
    "    # Calculate accuracy for 256 mnist test images\n",
    "    print \"Testing Accuracy:\", \\\n",
    "        sess.run(accuracy, feed_dict={x: mnist.test.images[:256],\n",
    "                                      y: mnist.test.labels[:256],\n",
    "                                      keep_prob: 1.})"
   ]
  }
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