part2_mnist_data_set.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# python notebook for Make Your Own Neural Network\n",
    "# working with the MNIST data set\n",
    "#\n",
    "# (c) Tariq Rashid, 2016\n",
    "# license is GPLv2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "import numpy\n",
    "import matplotlib.pyplot\n",
    "%matplotlib inline"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "# open the CSV file and read its contents into a list\n",
    "data_file = open(\"mnist_dataset/mnist_train_100.csv\", 'r')\n",
    "data_list = data_file.readlines()\n",
    "data_file.close()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "100"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# check the number of data records (examples)\n",
    "len(data_list)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
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      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# show a dataset record\n",
    "# the first number is the label, the rest are pixel colour values (greyscale 0-255)\n",
    "data_list[1]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<matplotlib.image.AxesImage at 0x1085264e0>"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "image/png": 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      "text/plain": [
       "<matplotlib.figure.Figure at 0x105b9dfd0>"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "# take the data from a record, rearrange it into a 28*28 array and plot it as an image\n",
    "all_values = data_list[1].split(',')\n",
    "image_array = numpy.asfarray(all_values[1:]).reshape((28,28))\n",
    "matplotlib.pyplot.imshow(image_array, cmap='Greys', interpolation='None')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[ 0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
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      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
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      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.208       0.62729412  0.99223529  0.62729412  0.20411765\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
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      "  0.01        0.19635294  0.934       0.98835294  0.98835294  0.98835294\n",
      "  0.93011765  0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.21964706  0.89129412  0.99223529  0.98835294  0.93788235\n",
      "  0.91458824  0.98835294  0.23129412  0.03329412  0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.04882353  0.24294118  0.87964706  0.98835294  0.99223529  0.98835294\n",
      "  0.79423529  0.33611765  0.98835294  0.99223529  0.48364706  0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.64282353  0.98835294  0.98835294  0.98835294  0.99223529\n",
      "  0.98835294  0.98835294  0.38270588  0.74376471  0.99223529  0.65835294\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.208       0.934       0.99223529  0.99223529\n",
      "  0.74764706  0.45258824  0.99223529  0.89517647  0.19247059  0.31670588\n",
      "  1.          0.66223529  0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.19635294  0.934       0.98835294\n",
      "  0.98835294  0.70494118  0.05658824  0.30117647  0.47976471  0.09152941\n",
      "  0.01        0.01        0.99223529  0.95341176  0.20411765  0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.15752941  0.65058824\n",
      "  0.99223529  0.91458824  0.81752941  0.33611765  0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.99223529  0.98835294  0.65058824\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.03717647\n",
      "  0.70105882  0.98835294  0.94176471  0.28564706  0.08376471  0.11870588\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.99223529  0.98835294  0.76705882  0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.23129412  0.98835294  0.98835294  0.25458824  0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.99223529  0.98835294  0.76705882  0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.77870588  0.99223529  0.74764706  0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  1.          0.99223529  0.77094118  0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.30505882  0.96505882  0.98835294  0.44482353  0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.99223529  0.98835294  0.58458824  0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.34        0.98835294  0.90294118  0.10705882  0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.03717647\n",
      "  0.53411765  0.99223529  0.73211765  0.05658824  0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.34        0.98835294  0.87576471  0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.03717647\n",
      "  0.51858824  0.98835294  0.88352941  0.28564706  0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.34        0.98835294  0.57294118  0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.19635294\n",
      "  0.65058824  0.98835294  0.68164706  0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.34388235  0.99223529  0.88352941\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.45258824  0.934       0.99223529  0.63894118  0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.34\n",
      "  0.98835294  0.97670588  0.57682353  0.19635294  0.12258824  0.34\n",
      "  0.70105882  0.88352941  0.99223529  0.87576471  0.65835294  0.22741176\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.34        0.98835294  0.98835294  0.98835294  0.89905882\n",
      "  0.84470588  0.98835294  0.98835294  0.98835294  0.77094118  0.51470588\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.11870588  0.78258824  0.98835294\n",
      "  0.98835294  0.99223529  0.98835294  0.98835294  0.91458824  0.57294118\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.10705882  0.50694118  0.98835294  0.99223529  0.98835294  0.55741176\n",
      "  0.15364706  0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01        0.01        0.01        0.01        0.01        0.01        0.01\n",
      "  0.01      ]\n"
     ]
    }
   ],
   "source": [
    "# scale input to range 0.01 to 1.00\n",
    "scaled_input = (numpy.asfarray(all_values[1:]) / 255.0 * 0.99) + 0.01\n",
    "print(scaled_input)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "#output nodes is 10 (example)\n",
    "onodes = 10\n",
    "targets = numpy.zeros(onodes) + 0.01\n",
    "targets[int(all_values[0])] = 0.99"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[ 0.99  0.01  0.01  0.01  0.01  0.01  0.01  0.01  0.01  0.01]\n"
     ]
    }
   ],
   "source": [
    "print(targets)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
 ],
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