{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Chaining a PCA and a logistic regression"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The PCA does an unsupervised dimensionality reduction, while the logistic regression does the prediction.\n",
    "\n",
    "We use a GridSearchCV to set the dimensionality of the PCA"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "image/png": 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\n",
      "text/plain": [
       "<Figure size 288x216 with 1 Axes>"
      ]
     },
     "metadata": {
      "needs_background": "light"
     },
     "output_type": "display_data"
    }
   ],
   "source": [
    "% matplotlib inline\n",
    "\n",
    "import numpy as np\n",
    "import matplotlib.pyplot as plt\n",
    "\n",
    "from sklearn import linear_model, decomposition, datasets\n",
    "from sklearn.pipeline import Pipeline\n",
    "from sklearn.model_selection import GridSearchCV\n",
    "\n",
    "logistic = linear_model.LogisticRegression()\n",
    "\n",
    "pca = decomposition.PCA()\n",
    "pipe = Pipeline(steps=[('pca', pca), ('logistic', logistic)])\n",
    "\n",
    "digits = datasets.load_digits()\n",
    "X_digits = digits.data\n",
    "y_digits = digits.target\n",
    "\n",
    "# Plot the PCA spectrum\n",
    "pca.fit(X_digits)\n",
    "\n",
    "plt.figure(1, figsize=(4, 3))\n",
    "plt.clf()\n",
    "plt.axes([.2, .2, .7, .7])\n",
    "plt.plot(pca.explained_variance_, linewidth=2)\n",
    "plt.axis('tight')\n",
    "plt.xlabel('n_components')\n",
    "plt.ylabel('explained_variance_')\n",
    "\n",
    "# Prediction\n",
    "n_components = [20, 40, 64]\n",
    "Cs = np.logspace(-4, 4, 3)\n",
    "\n",
    "# Parameters of pipelines can be set using ‘__’ separated parameter names:\n",
    "estimator = GridSearchCV(pipe,\n",
    "                         dict(pca__n_components=n_components,\n",
    "                              logistic__C=Cs))\n",
    "estimator.fit(X_digits, y_digits)\n",
    "\n",
    "plt.axvline(estimator.best_estimator_.named_steps['pca'].n_components,\n",
    "            linestyle=':', label='n_components chosen')\n",
    "plt.legend(prop=dict(size=12))\n",
    "plt.show()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "(1797, 64)\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "<Figure size 432x288 with 0 Axes>"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
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      "text/plain": [
       "<Figure size 288x288 with 1 Axes>"
      ]
     },
     "metadata": {
      "needs_background": "light"
     },
     "output_type": "display_data"
    }
   ],
   "source": [
    "# Compare the performance\n",
    "from sklearn.datasets import load_digits\n",
    "from sklearn.linear_model.logistic import LogisticRegression\n",
    "from sklearn import decomposition\n",
    "from sklearn.metrics import confusion_matrix\n",
    "from sklearn.metrics import accuracy_score\n",
    "import matplotlib.pyplot as plt\n",
    "\n",
    "\n",
    "# load digital data\n",
    "digits, dig_label = load_digits(return_X_y=True)\n",
    "print(digits.shape)\n",
    "\n",
    "# draw one digital\n",
    "plt.gray() \n",
    "plt.matshow(digits[0].reshape([8, 8])) \n",
    "plt.show() \n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "accuracy train = 0.998608, accuracy_test = 0.897222\n"
     ]
    }
   ],
   "source": [
    "\n",
    "# calculate train/test data number\n",
    "N = len(digits)\n",
    "N_train = int(N*0.8)\n",
    "N_test = N - N_train\n",
    "\n",
    "# split train/test data\n",
    "x_train = digits[:N_train, :]\n",
    "y_train = dig_label[:N_train]\n",
    "x_test  = digits[N_train:, :]\n",
    "y_test  = dig_label[N_train:]\n",
    "\n",
    "# do logistic regression\n",
    "lr=LogisticRegression()\n",
    "lr.fit(x_train,y_train)\n",
    "\n",
    "pred_train = lr.predict(x_train)\n",
    "pred_test  = lr.predict(x_test)\n",
    "\n",
    "# calculate train/test accuracy\n",
    "acc_train = accuracy_score(y_train, pred_train)\n",
    "acc_test = accuracy_score(y_test, pred_test)\n",
    "print(\"accuracy train = %f, accuracy_test = %f\" % (acc_train, acc_test))\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "accuracy train = 0.987474, accuracy_test = 0.894444\n"
     ]
    }
   ],
   "source": [
    "# do PCA with 'n_components=40'\n",
    "pca = decomposition.PCA(n_components=40)\n",
    "pca.fit(x_train)\n",
    "\n",
    "x_train_pca = pca.transform(x_train)\n",
    "x_test_pca = pca.transform(x_test)\n",
    "\n",
    "# do logistic regression\n",
    "lr=LogisticRegression()\n",
    "lr.fit(x_train_pca,y_train)\n",
    "\n",
    "pred_train = lr.predict(x_train_pca)\n",
    "pred_test  = lr.predict(x_test_pca)\n",
    "\n",
    "# calculate train/test accuracy\n",
    "acc_train = accuracy_score(y_train, pred_train)\n",
    "acc_test = accuracy_score(y_test, pred_test)\n",
    "print(\"accuracy train = %f, accuracy_test = %f\" % (acc_train, acc_test))\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## References\n",
    "* [Pipelining: chaining a PCA and a logistic regression](http://scikit-learn.org/stable/auto_examples/plot_digits_pipe.html)"
   ]
  }
 ],
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