tb5_kaggle_book_ch5-3-4.ipynb

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    "import pandas as pd\n",
    "from sklearn.ensemble import RandomForestClassifier\n",
    "\n",
    "df_train = pd.read_csv('./input/train.csv')\n",
    "df_test = pd.read_csv('./input/test.csv')\n",
    "\n",
    "# Embarkedの補完\n",
    "df_train.loc[df_train['PassengerId'].isin([62, 830]), 'Embarked'] = 'C'\n",
    "\n",
    "# Fareの補完\n",
    "df_test.loc[df_test['PassengerId'] == 1044, 'Fare'] = 13.675550\n",
    "\n",
    "#Age変換のための関数\n",
    "def impute_age(cols):\n",
    "    Age = cols[0]\n",
    "    Pclass = cols[1]    \n",
    "    if pd.isnull(Age):        \n",
    "        if Pclass == 1:\n",
    "            return 39\n",
    "        elif Pclass == 2:\n",
    "            return 30\n",
    "        else:\n",
    "            return 25    \n",
    "    else:\n",
    "        return Age\n",
    "\n",
    "\n",
    "data = [df_train, df_test]\n",
    "for df in data:\n",
    "    # Ageの補完\n",
    "    df['Age'] = df[['Age','Pclass']].apply(impute_age, axis = 1) \n",
    "\n",
    "    # 性別の変換\n",
    "    df['Sex'] = df['Sex'].map({\"male\": 0, \"female\": 1})\n",
    "        \n",
    "    # Embarked\n",
    "    df['Embarked'] = df['Embarked'].map( {'S': 0, 'C': 1, 'Q': 2} ).astype(int)\n",
    "    \n",
    "    # Fareのカテゴリ変数化\n",
    "    df.loc[ df['Fare'] <= 7.91, 'Fare'] = 0\n",
    "    df.loc[(df['Fare'] > 7.91) & (df['Fare'] <= 14.454), 'Fare'] = 1\n",
    "    df.loc[(df['Fare'] > 14.454) & (df['Fare'] <= 31), 'Fare']   = 2\n",
    "    df.loc[ df['Fare'] > 31, 'Fare'] = 3\n",
    "    df['Fare'] = df['Fare'].astype(int)\n",
    "\n",
    "    # Ageのカテゴリ変数化\n",
    "    df.loc[ df['Age'] <= 16, 'Age'] = 0\n",
    "    df.loc[(df['Age'] > 16) & (df['Age'] <= 32), 'Age'] = 1\n",
    "    df.loc[(df['Age'] > 32) & (df['Age'] <= 48), 'Age'] = 2\n",
    "    df.loc[ df['Age'] > 48, 'Age']  = 3\n",
    "    df['Age'] = df['Age'].astype(int)\n",
    "    \n",
    "     # FamilySizeとIsAloneの作成\n",
    "    df['FamilySize'] = df['SibSp'] + df['Parch'] + 1\n",
    "    df['IsAlone'] = 0\n",
    "    df.loc[df['FamilySize'] == 1, 'IsAlone'] = 1 \n",
    "    \n",
    "# 不要な列の削除    \n",
    "df_train.drop(['Name', 'Cabin', 'Ticket','SibSp','Parch'], axis=1, inplace=True)\n",
    "df_test.drop(['Name', 'Cabin', 'Ticket','SibSp','Parch'], axis=1, inplace=True) \n",
    "\n",
    "# X_train、Y_train、X_testを作成\n",
    "X_train = df_train.drop([\"PassengerId\",\"Survived\"], axis=1)\n",
    "Y_train = df_train[\"Survived\"]\n",
    "X_test  = df_test.drop(\"PassengerId\", axis=1).copy()\n",
    "\n",
    "# 学習\n",
    "forest = RandomForestClassifier(random_state=1)\n",
    "forest.fit(X_train, Y_train)\n",
    "Y_pred = forest.predict(X_test)\n",
    "\n",
    "# 提出データの作成\n",
    "submission = pd.DataFrame({\n",
    "        \"PassengerId\": df_test[\"PassengerId\"],\n",
    "        \"Survived\": Y_pred})\n",
    "submission.to_csv('submit.csv', index=False)"
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