homework/Day_028_HW.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {
    "collapsed": true
   },
   "source": [
    "# 範例 : 計程車費率預測\n",
    "https://www.kaggle.com/c/new-york-city-taxi-fare-prediction"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# [作業目標]\n",
    "- 使用並觀察特徵組合, 在計程車費率預測競賽的影響"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# [作業重點]\n",
    "- 仿造範例並參考今日課程內容, 使用經緯度一圈的長度比的概念造出新特徵, 觀察有什麼影響 (In[6], Out[6])\n",
    "- 只使用上面所造的這個新特徵, 觀察有什麼影響 (In[7], Out[7])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "/anaconda3/lib/python3.7/site-packages/sklearn/ensemble/weight_boosting.py:29: DeprecationWarning: numpy.core.umath_tests is an internal NumPy module and should not be imported. It will be removed in a future NumPy release.\n",
      "  from numpy.core.umath_tests import inner1d\n"
     ]
    },
    {
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       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>pickup_datetime</th>\n",
       "      <th>pickup_longitude</th>\n",
       "      <th>pickup_latitude</th>\n",
       "      <th>dropoff_longitude</th>\n",
       "      <th>dropoff_latitude</th>\n",
       "      <th>passenger_count</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>2011-10-21 23:54:10 UTC</td>\n",
       "      <td>-73.990580</td>\n",
       "      <td>40.761071</td>\n",
       "      <td>-73.981128</td>\n",
       "      <td>40.758634</td>\n",
       "      <td>2</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>2015-02-03 10:42:03 UTC</td>\n",
       "      <td>-73.988403</td>\n",
       "      <td>40.723431</td>\n",
       "      <td>-73.989647</td>\n",
       "      <td>40.741695</td>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>2014-03-16 18:58:58 UTC</td>\n",
       "      <td>-74.015785</td>\n",
       "      <td>40.715110</td>\n",
       "      <td>-74.012029</td>\n",
       "      <td>40.707888</td>\n",
       "      <td>2</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3</th>\n",
       "      <td>2009-06-13 16:10:54 UTC</td>\n",
       "      <td>-73.977322</td>\n",
       "      <td>40.787275</td>\n",
       "      <td>-73.958030</td>\n",
       "      <td>40.778838</td>\n",
       "      <td>3</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4</th>\n",
       "      <td>2014-06-12 03:25:56 UTC</td>\n",
       "      <td>-73.989683</td>\n",
       "      <td>40.729717</td>\n",
       "      <td>-73.982490</td>\n",
       "      <td>40.761887</td>\n",
       "      <td>3</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
      ],
      "text/plain": [
       "           pickup_datetime  pickup_longitude  pickup_latitude  \\\n",
       "0  2011-10-21 23:54:10 UTC        -73.990580        40.761071   \n",
       "1  2015-02-03 10:42:03 UTC        -73.988403        40.723431   \n",
       "2  2014-03-16 18:58:58 UTC        -74.015785        40.715110   \n",
       "3  2009-06-13 16:10:54 UTC        -73.977322        40.787275   \n",
       "4  2014-06-12 03:25:56 UTC        -73.989683        40.729717   \n",
       "\n",
       "   dropoff_longitude  dropoff_latitude  passenger_count  \n",
       "0         -73.981128         40.758634                2  \n",
       "1         -73.989647         40.741695                1  \n",
       "2         -74.012029         40.707888                2  \n",
       "3         -73.958030         40.778838                3  \n",
       "4         -73.982490         40.761887                3  "
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# 做完特徵工程前的所有準備\n",
    "import pandas as pd\n",
    "import numpy as np\n",
    "import datetime\n",
    "from sklearn.preprocessing import MinMaxScaler\n",
    "from sklearn.model_selection import cross_val_score\n",
    "from sklearn.linear_model import LinearRegression\n",
    "from sklearn.ensemble import GradientBoostingRegressor\n",
    "\n",
    "data_path = 'data/'\n",
    "df = pd.read_csv(data_path + 'taxi_data1.csv')\n",
    "\n",
    "train_Y = df['fare_amount']\n",
    "df = df.drop(['fare_amount'] , axis=1)\n",
    "df.head()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "data": {
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       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>pickup_datetime</th>\n",
       "      <th>pickup_longitude</th>\n",
       "      <th>pickup_latitude</th>\n",
       "      <th>dropoff_longitude</th>\n",
       "      <th>dropoff_latitude</th>\n",
       "      <th>passenger_count</th>\n",
       "      <th>pickup_year</th>\n",
       "      <th>pickup_month</th>\n",
       "      <th>pickup_day</th>\n",
       "      <th>pickup_hour</th>\n",
       "      <th>pickup_minute</th>\n",
       "      <th>pickup_second</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>2011-10-21 23:54:10</td>\n",
       "      <td>-73.990580</td>\n",
       "      <td>40.761071</td>\n",
       "      <td>-73.981128</td>\n",
       "      <td>40.758634</td>\n",
       "      <td>2</td>\n",
       "      <td>2011</td>\n",
       "      <td>10</td>\n",
       "      <td>21</td>\n",
       "      <td>23</td>\n",
       "      <td>54</td>\n",
       "      <td>10</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>2015-02-03 10:42:03</td>\n",
       "      <td>-73.988403</td>\n",
       "      <td>40.723431</td>\n",
       "      <td>-73.989647</td>\n",
       "      <td>40.741695</td>\n",
       "      <td>1</td>\n",
       "      <td>2015</td>\n",
       "      <td>2</td>\n",
       "      <td>3</td>\n",
       "      <td>10</td>\n",
       "      <td>42</td>\n",
       "      <td>3</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>2014-03-16 18:58:58</td>\n",
       "      <td>-74.015785</td>\n",
       "      <td>40.715110</td>\n",
       "      <td>-74.012029</td>\n",
       "      <td>40.707888</td>\n",
       "      <td>2</td>\n",
       "      <td>2014</td>\n",
       "      <td>3</td>\n",
       "      <td>16</td>\n",
       "      <td>18</td>\n",
       "      <td>58</td>\n",
       "      <td>58</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3</th>\n",
       "      <td>2009-06-13 16:10:54</td>\n",
       "      <td>-73.977322</td>\n",
       "      <td>40.787275</td>\n",
       "      <td>-73.958030</td>\n",
       "      <td>40.778838</td>\n",
       "      <td>3</td>\n",
       "      <td>2009</td>\n",
       "      <td>6</td>\n",
       "      <td>13</td>\n",
       "      <td>16</td>\n",
       "      <td>10</td>\n",
       "      <td>54</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4</th>\n",
       "      <td>2014-06-12 03:25:56</td>\n",
       "      <td>-73.989683</td>\n",
       "      <td>40.729717</td>\n",
       "      <td>-73.982490</td>\n",
       "      <td>40.761887</td>\n",
       "      <td>3</td>\n",
       "      <td>2014</td>\n",
       "      <td>6</td>\n",
       "      <td>12</td>\n",
       "      <td>3</td>\n",
       "      <td>25</td>\n",
       "      <td>56</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
      ],
      "text/plain": [
       "      pickup_datetime  pickup_longitude  pickup_latitude  dropoff_longitude  \\\n",
       "0 2011-10-21 23:54:10        -73.990580        40.761071         -73.981128   \n",
       "1 2015-02-03 10:42:03        -73.988403        40.723431         -73.989647   \n",
       "2 2014-03-16 18:58:58        -74.015785        40.715110         -74.012029   \n",
       "3 2009-06-13 16:10:54        -73.977322        40.787275         -73.958030   \n",
       "4 2014-06-12 03:25:56        -73.989683        40.729717         -73.982490   \n",
       "\n",
       "   dropoff_latitude  passenger_count  pickup_year  pickup_month  pickup_day  \\\n",
       "0         40.758634                2         2011            10          21   \n",
       "1         40.741695                1         2015             2           3   \n",
       "2         40.707888                2         2014             3          16   \n",
       "3         40.778838                3         2009             6          13   \n",
       "4         40.761887                3         2014             6          12   \n",
       "\n",
       "   pickup_hour  pickup_minute  pickup_second  \n",
       "0           23             54             10  \n",
       "1           10             42              3  \n",
       "2           18             58             58  \n",
       "3           16             10             54  \n",
       "4            3             25             56  "
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# 時間特徵分解方式:使用datetime\n",
    "df['pickup_datetime'] = df['pickup_datetime'].apply(lambda x: datetime.datetime.strptime(x, '%Y-%m-%d %H:%M:%S UTC'))\n",
    "df['pickup_year'] = df['pickup_datetime'].apply(lambda x: datetime.datetime.strftime(x, '%Y')).astype('int64')\n",
    "df['pickup_month'] = df['pickup_datetime'].apply(lambda x: datetime.datetime.strftime(x, '%m')).astype('int64')\n",
    "df['pickup_day'] = df['pickup_datetime'].apply(lambda x: datetime.datetime.strftime(x, '%d')).astype('int64')\n",
    "df['pickup_hour'] = df['pickup_datetime'].apply(lambda x: datetime.datetime.strftime(x, '%H')).astype('int64')\n",
    "df['pickup_minute'] = df['pickup_datetime'].apply(lambda x: datetime.datetime.strftime(x, '%M')).astype('int64')\n",
    "df['pickup_second'] = df['pickup_datetime'].apply(lambda x: datetime.datetime.strftime(x, '%S')).astype('int64')\n",
    "df.head()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Linear Reg Score : 0.02687687147563551\n",
      "Gradient Boosting Reg Score : 0.7096329301058834\n"
     ]
    }
   ],
   "source": [
    "# 將結果使用線性迴歸 / 梯度提升樹分別看結果\n",
    "df = df.drop(['pickup_datetime'] , axis=1)\n",
    "scaler = MinMaxScaler()\n",
    "train_X = scaler.fit_transform(df)\n",
    "Linear = LinearRegression()\n",
    "print(f'Linear Reg Score : {cross_val_score(Linear, train_X, train_Y, cv=5).mean()}')\n",
    "GDBT = GradientBoostingRegressor()\n",
    "print(f'Gradient Boosting Reg Score : {cross_val_score(GDBT, train_X, train_Y, cv=5).mean()}')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
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       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>distance_2D</th>\n",
       "      <th>longitude_diff</th>\n",
       "      <th>latitude_diff</th>\n",
       "      <th>pickup_longitude</th>\n",
       "      <th>pickup_latitude</th>\n",
       "      <th>dropoff_longitude</th>\n",
       "      <th>dropoff_latitude</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>0.009761</td>\n",
       "      <td>0.009452</td>\n",
       "      <td>-0.002437</td>\n",
       "      <td>-73.990580</td>\n",
       "      <td>40.761071</td>\n",
       "      <td>-73.981128</td>\n",
       "      <td>40.758634</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>0.018307</td>\n",
       "      <td>-0.001244</td>\n",
       "      <td>0.018265</td>\n",
       "      <td>-73.988403</td>\n",
       "      <td>40.723431</td>\n",
       "      <td>-73.989647</td>\n",
       "      <td>40.741695</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>0.008140</td>\n",
       "      <td>0.003756</td>\n",
       "      <td>-0.007222</td>\n",
       "      <td>-74.015785</td>\n",
       "      <td>40.715110</td>\n",
       "      <td>-74.012029</td>\n",
       "      <td>40.707888</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3</th>\n",
       "      <td>0.021056</td>\n",
       "      <td>0.019292</td>\n",
       "      <td>-0.008437</td>\n",
       "      <td>-73.977322</td>\n",
       "      <td>40.787275</td>\n",
       "      <td>-73.958030</td>\n",
       "      <td>40.778838</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4</th>\n",
       "      <td>0.032964</td>\n",
       "      <td>0.007193</td>\n",
       "      <td>0.032170</td>\n",
       "      <td>-73.989683</td>\n",
       "      <td>40.729717</td>\n",
       "      <td>-73.982490</td>\n",
       "      <td>40.761887</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
      ],
      "text/plain": [
       "   distance_2D  longitude_diff  latitude_diff  pickup_longitude  \\\n",
       "0     0.009761        0.009452      -0.002437        -73.990580   \n",
       "1     0.018307       -0.001244       0.018265        -73.988403   \n",
       "2     0.008140        0.003756      -0.007222        -74.015785   \n",
       "3     0.021056        0.019292      -0.008437        -73.977322   \n",
       "4     0.032964        0.007193       0.032170        -73.989683   \n",
       "\n",
       "   pickup_latitude  dropoff_longitude  dropoff_latitude  \n",
       "0        40.761071         -73.981128         40.758634  \n",
       "1        40.723431         -73.989647         40.741695  \n",
       "2        40.715110         -74.012029         40.707888  \n",
       "3        40.787275         -73.958030         40.778838  \n",
       "4        40.729717         -73.982490         40.761887  "
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# 增加緯度差, 經度差, 座標距離等三個特徵\n",
    "df['longitude_diff'] = df['dropoff_longitude'] - df['pickup_longitude']\n",
    "df['latitude_diff'] = df['dropoff_latitude'] - df['pickup_latitude']\n",
    "df['distance_2D'] = (df['longitude_diff']**2 + df['latitude_diff']**2)**0.5\n",
    "df[['distance_2D', 'longitude_diff', 'latitude_diff', 'pickup_longitude', 'pickup_latitude', 'dropoff_longitude', 'dropoff_latitude']].head()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Linear Reg Score : 0.027359756828920067\n",
      "Gradient Boosting Reg Score : 0.8046995051690585\n"
     ]
    }
   ],
   "source": [
    "# 結果 : 準確度上升\n",
    "train_X = scaler.fit_transform(df)\n",
    "print(f'Linear Reg Score : {cross_val_score(Linear, train_X, train_Y, cv=5).mean()}')\n",
    "print(f'Gradient Boosting Reg Score : {cross_val_score(GDBT, train_X, train_Y, cv=5).mean()}')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "collapsed": true
   },
   "source": [
    "# 作業1\n",
    "* 參考今日教材，試著使用經緯度一圈的長度比這一概念，組合出一個新特徵，再觀察原特徵加上新特徵是否提升了正確率?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Linear Reg Score : 0.02755337276984029\n",
      "Gradient Boosting Reg Score : 0.8057211124748674\n"
     ]
    }
   ],
   "source": [
    "import math\n",
    "# 觀察資料緯度集中在 40.75 度附近\n",
    "# 可以算得經度與緯度代表的長度比為 cos(40.75度) : 1 = 0.75756 : 1\n",
    "latitude_factor = math.cos(40.75)\n",
    "df['distance_real'] = ((df['longitude_diff']*latitude_factor)**2 + df['latitude_diff']**2)**0.5\n",
    "\n",
    "# 觀察結果 \n",
    "train_X = scaler.fit_transform(df)\n",
    "print(f'Linear Reg Score : {cross_val_score(Linear, train_X, train_Y, cv=5).mean()}')\n",
    "print(f'Gradient Boosting Reg Score : {cross_val_score(GDBT, train_X, train_Y, cv=5).mean()}')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 作業2\n",
    "* 試著只使用新特徵估計目標值(忽略原特徵)，效果跟作業1的結果比較起來效果如何?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Linear Reg Score : 0.0014283651615513814\n",
      "Gradient Boosting Reg Score : 0.7431576667912265\n"
     ]
    }
   ],
   "source": [
    "train_X = scaler.fit_transform(df[['distance_real']])\n",
    "print(f'Linear Reg Score : {cross_val_score(Linear, train_X, train_Y, cv=5).mean()}')\n",
    "print(f'Gradient Boosting Reg Score : {cross_val_score(GDBT, train_X, train_Y, cv=5).mean()}')"
   ]
  },
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   "source": []
  }
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