Add TensorFlow AlexNet notebook.

dongzhixiang · Dec 28, 2015 · 6a98b32 · 6a98b32
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diff --git a/README.md b/README.md
@@ -98,6 +98,7 @@ IPython Notebook(s) demonstrating deep learning functionality.
 | [tsf-linear](http://nbviewer.ipython.org/github/donnemartin/data-science-ipython-notebooks/blob/master/deep-learning/tensor-flow-examples/2_basic_classifiers/linear_regression.ipynb) | Implement linear regression in TensorFlow. |
 | [tsf-logistic](http://nbviewer.ipython.org/github/donnemartin/data-science-ipython-notebooks/blob/master/deep-learning/tensor-flow-examples/2_basic_classifiers/logistic_regression.ipynb) | Implement logistic regression in TensorFlow. |
 | [tsf-nn](http://nbviewer.ipython.org/github/donnemartin/data-science-ipython-notebooks/blob/master/deep-learning/tensor-flow-examples/2_basic_classifiers/nearest_neighbor.ipynb) | Implement nearest neighboars in TensorFlow. |
+| [tsf-alex](http://nbviewer.ipython.org/github/donnemartin/data-science-ipython-notebooks/blob/master/deep-learning/tensor-flow-examples/3_neural_networks/alexnet.ipynb) | Implement AlexNet in TensorFlow. |
 
 ### tensor-flow-exercises
 

diff --git a/deep-learning/tensor-flow-examples/notebooks/3_neural_networks/alexnet.ipynb b/deep-learning/tensor-flow-examples/notebooks/3_neural_networks/alexnet.ipynb
@@ -0,0 +1,345 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# AlexNet in TensorFlow\n",
+    "\n",
+    "Credits: Forked from [TensorFlow-Examples](https://github.com/aymericdamien/TensorFlow-Examples) by Aymeric Damien\n",
+    "\n",
+    "## Setup\n",
+    "\n",
+    "Refer to the [setup instructions](http://nbviewer.ipython.org/github/donnemartin/data-science-ipython-notebooks/blob/master/deep-learning/tensor-flow-examples/Setup_TensorFlow.md)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "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 MINST data\n",
+    "import input_data\n",
+    "mnist = input_data.read_data_sets(\"/tmp/data/\", one_hot=True)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "import tensorflow as tf"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 17,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "# Parameters\n",
+    "learning_rate = 0.001\n",
+    "training_iters = 300000\n",
+    "batch_size = 64\n",
+    "display_step = 100"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "# 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 = 0.8 # Dropout, probability to keep units"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "# tf Graph input\n",
+    "x = tf.placeholder(tf.types.float32, [None, n_input])\n",
+    "y = tf.placeholder(tf.types.float32, [None, n_classes])\n",
+    "keep_prob = tf.placeholder(tf.types.float32) # dropout (keep probability)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "# Create AlexNet model\n",
+    "def conv2d(name, l_input, w, b):\n",
+    "    return tf.nn.relu(tf.nn.bias_add(tf.nn.conv2d(l_input, w, strides=[1, 1, 1, 1], \n",
+    "                                                  padding='SAME'),b), name=name)\n",
+    "\n",
+    "def max_pool(name, l_input, k):\n",
+    "    return tf.nn.max_pool(l_input, ksize=[1, k, k, 1], strides=[1, k, k, 1], \n",
+    "                          padding='SAME', name=name)\n",
+    "\n",
+    "def norm(name, l_input, lsize=4):\n",
+    "    return tf.nn.lrn(l_input, lsize, bias=1.0, alpha=0.001 / 9.0, beta=0.75, name=name)\n",
+    "\n",
+    "def alex_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('conv1', _X, _weights['wc1'], _biases['bc1'])\n",
+    "    # Max Pooling (down-sampling)\n",
+    "    pool1 = max_pool('pool1', conv1, k=2)\n",
+    "    # Apply Normalization\n",
+    "    norm1 = norm('norm1', pool1, lsize=4)\n",
+    "    # Apply Dropout\n",
+    "    norm1 = tf.nn.dropout(norm1, _dropout)\n",
+    "\n",
+    "    # Convolution Layer\n",
+    "    conv2 = conv2d('conv2', norm1, _weights['wc2'], _biases['bc2'])\n",
+    "    # Max Pooling (down-sampling)\n",
+    "    pool2 = max_pool('pool2', conv2, k=2)\n",
+    "    # Apply Normalization\n",
+    "    norm2 = norm('norm2', pool2, lsize=4)\n",
+    "    # Apply Dropout\n",
+    "    norm2 = tf.nn.dropout(norm2, _dropout)\n",
+    "\n",
+    "    # Convolution Layer\n",
+    "    conv3 = conv2d('conv3', norm2, _weights['wc3'], _biases['bc3'])\n",
+    "    # Max Pooling (down-sampling)\n",
+    "    pool3 = max_pool('pool3', conv3, k=2)\n",
+    "    # Apply Normalization\n",
+    "    norm3 = norm('norm3', pool3, lsize=4)\n",
+    "    # Apply Dropout\n",
+    "    norm3 = tf.nn.dropout(norm3, _dropout)\n",
+    "\n",
+    "    # Fully connected layer\n",
+    "    # Reshape conv3 output to fit dense layer input\n",
+    "    dense1 = tf.reshape(norm3, [-1, _weights['wd1'].get_shape().as_list()[0]]) \n",
+    "    # Relu activation\n",
+    "    dense1 = tf.nn.relu(tf.matmul(dense1, _weights['wd1']) + _biases['bd1'], name='fc1')\n",
+    "    \n",
+    "    # Relu activation\n",
+    "    dense2 = tf.nn.relu(tf.matmul(dense1, _weights['wd2']) + _biases['bd2'], name='fc2') \n",
+    "\n",
+    "    # Output, class prediction\n",
+    "    out = tf.matmul(dense2, _weights['out']) + _biases['out']\n",
+    "    return out"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "# Store layers weight & bias\n",
+    "weights = {\n",
+    "    'wc1': tf.Variable(tf.random_normal([3, 3, 1, 64])),\n",
+    "    'wc2': tf.Variable(tf.random_normal([3, 3, 64, 128])),\n",
+    "    'wc3': tf.Variable(tf.random_normal([3, 3, 128, 256])),\n",
+    "    'wd1': tf.Variable(tf.random_normal([4*4*256, 1024])),\n",
+    "    'wd2': tf.Variable(tf.random_normal([1024, 1024])),\n",
+    "    'out': tf.Variable(tf.random_normal([1024, 10]))\n",
+    "}\n",
+    "biases = {\n",
+    "    'bc1': tf.Variable(tf.random_normal([64])),\n",
+    "    'bc2': tf.Variable(tf.random_normal([128])),\n",
+    "    'bc3': tf.Variable(tf.random_normal([256])),\n",
+    "    'bd1': tf.Variable(tf.random_normal([1024])),\n",
+    "    'bd2': tf.Variable(tf.random_normal([1024])),\n",
+    "    'out': tf.Variable(tf.random_normal([n_classes]))\n",
+    "}"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "# Construct model\n",
+    "pred = alex_net(x, weights, biases, keep_prob)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "# 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)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "# 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.types.float32))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "# Initializing the variables\n",
+    "init = tf.initialize_all_variables()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 18,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Iter 6400, Minibatch Loss= 29666.185547, Training Accuracy= 0.59375\n",
+      "Iter 12800, Minibatch Loss= 22125.562500, Training Accuracy= 0.60938\n",
+      "Iter 19200, Minibatch Loss= 22631.134766, Training Accuracy= 0.59375\n",
+      "Iter 25600, Minibatch Loss= 18498.414062, Training Accuracy= 0.62500\n",
+      "Iter 32000, Minibatch Loss= 11318.283203, Training Accuracy= 0.70312\n",
+      "Iter 38400, Minibatch Loss= 12076.280273, Training Accuracy= 0.70312\n",
+      "Iter 44800, Minibatch Loss= 8195.520508, Training Accuracy= 0.82812\n",
+      "Iter 51200, Minibatch Loss= 5176.181641, Training Accuracy= 0.84375\n",
+      "Iter 57600, Minibatch Loss= 8951.896484, Training Accuracy= 0.81250\n",
+      "Iter 64000, Minibatch Loss= 10096.946289, Training Accuracy= 0.78125\n",
+      "Iter 70400, Minibatch Loss= 11466.641602, Training Accuracy= 0.68750\n",
+      "Iter 76800, Minibatch Loss= 7469.824219, Training Accuracy= 0.78125\n",
+      "Iter 83200, Minibatch Loss= 4147.449219, Training Accuracy= 0.89062\n",
+      "Iter 89600, Minibatch Loss= 5904.782227, Training Accuracy= 0.82812\n",
+      "Iter 96000, Minibatch Loss= 718.493713, Training Accuracy= 0.93750\n",
+      "Iter 102400, Minibatch Loss= 2184.151367, Training Accuracy= 0.93750\n",
+      "Iter 108800, Minibatch Loss= 2354.463135, Training Accuracy= 0.89062\n",
+      "Iter 115200, Minibatch Loss= 8612.959961, Training Accuracy= 0.81250\n",
+      "Iter 121600, Minibatch Loss= 2225.773926, Training Accuracy= 0.84375\n",
+      "Iter 128000, Minibatch Loss= 160.583618, Training Accuracy= 0.96875\n",
+      "Iter 134400, Minibatch Loss= 1524.846069, Training Accuracy= 0.93750\n",
+      "Iter 140800, Minibatch Loss= 3501.871094, Training Accuracy= 0.89062\n",
+      "Iter 147200, Minibatch Loss= 661.977051, Training Accuracy= 0.96875\n",
+      "Iter 153600, Minibatch Loss= 367.857788, Training Accuracy= 0.98438\n",
+      "Iter 160000, Minibatch Loss= 1735.458740, Training Accuracy= 0.90625\n",
+      "Iter 166400, Minibatch Loss= 209.320374, Training Accuracy= 0.95312\n",
+      "Iter 172800, Minibatch Loss= 1788.553955, Training Accuracy= 0.90625\n",
+      "Iter 179200, Minibatch Loss= 912.995544, Training Accuracy= 0.93750\n",
+      "Iter 185600, Minibatch Loss= 2534.074463, Training Accuracy= 0.87500\n",
+      "Iter 192000, Minibatch Loss= 73.052612, Training Accuracy= 0.96875\n",
+      "Iter 198400, Minibatch Loss= 1609.606323, Training Accuracy= 0.93750\n",
+      "Iter 204800, Minibatch Loss= 1823.219727, Training Accuracy= 0.96875\n",
+      "Iter 211200, Minibatch Loss= 578.051086, Training Accuracy= 0.96875\n",
+      "Iter 217600, Minibatch Loss= 1532.326172, Training Accuracy= 0.89062\n",
+      "Iter 224000, Minibatch Loss= 769.775269, Training Accuracy= 0.95312\n",
+      "Iter 230400, Minibatch Loss= 2614.737793, Training Accuracy= 0.92188\n",
+      "Iter 236800, Minibatch Loss= 938.664368, Training Accuracy= 0.95312\n",
+      "Iter 243200, Minibatch Loss= 1520.495605, Training Accuracy= 0.93750\n",
+      "Iter 249600, Minibatch Loss= 657.419739, Training Accuracy= 0.95312\n",
+      "Iter 256000, Minibatch Loss= 522.802124, Training Accuracy= 0.90625\n",
+      "Iter 262400, Minibatch Loss= 211.188477, Training Accuracy= 0.96875\n",
+      "Iter 268800, Minibatch Loss= 520.451172, Training Accuracy= 0.92188\n",
+      "Iter 275200, Minibatch Loss= 1418.759155, Training Accuracy= 0.89062\n",
+      "Iter 281600, Minibatch Loss= 241.748596, Training Accuracy= 0.96875\n",
+      "Iter 288000, Minibatch Loss= 0.000000, Training Accuracy= 1.00000\n",
+      "Iter 294400, Minibatch Loss= 1535.772827, Training Accuracy= 0.92188\n",
+      "Optimization Finished!\n",
+      "Testing Accuracy: 0.980469\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_xs, batch_ys = mnist.train.next_batch(batch_size)\n",
+    "        # Fit training using batch data\n",
+    "        sess.run(optimizer, feed_dict={x: batch_xs, y: batch_ys, keep_prob: dropout})\n",
+    "        if step % display_step == 0:\n",
+    "            # Calculate batch accuracy\n",
+    "            acc = sess.run(accuracy, feed_dict={x: batch_xs, y: batch_ys, keep_prob: 1.})\n",
+    "            # Calculate batch loss\n",
+    "            loss = sess.run(cost, feed_dict={x: batch_xs, y: batch_ys, keep_prob: 1.})\n",
+    "            print \"Iter \" + str(step*batch_size) + \", Minibatch Loss= \" \\\n",
+    "                  + \"{:.6f}\".format(loss) + \", Training Accuracy= \" + \"{:.5f}\".format(acc)\n",
+    "        step += 1\n",
+    "    print \"Optimization Finished!\"\n",
+    "    # Calculate accuracy for 256 mnist test images\n",
+    "    print \"Testing Accuracy:\", sess.run(accuracy, feed_dict={x: mnist.test.images[:256], \n",
+    "                                                             y: mnist.test.labels[:256], \n",
+    "                                                             keep_prob: 1.})"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.4.3"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}