[백지현] week9_2024_GDG_ML입문스터디

week4/ML스터디 4주차 -3.ipynb

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+{"cells":[{"cell_type":"markdown","metadata":{"id":"zp6fW8MP-mrO"},"source":["# 트리의 앙상블"]},{"cell_type":"markdown","metadata":{"id":"pv1IwHmU-mrU"},"source":["<table align=\"left\">\n","  <td>\n","    <a target=\"_blank\" href=\"https://colab.research.google.com/github/rickiepark/hg-mldl/blob/master/5-3.ipynb\"><img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" />구글 코랩에서 실행하기</a>\n","  </td>\n","</table>"]},{"cell_type":"markdown","metadata":{"id":"dIaIAizcRSG-"},"source":["## 랜덤포레스트"]},{"cell_type":"code","execution_count":null,"metadata":{"id":"ioJUlZ0M_uSZ"},"outputs":[],"source":["import numpy as np\n","import pandas as pd\n","from sklearn.model_selection import train_test_split\n","\n","wine = pd.read_csv('https://bit.ly/wine_csv_data')\n","\n","data = wine[['alcohol', 'sugar', 'pH']].to_numpy()\n","target = wine['class'].to_numpy()\n","\n","train_input, test_input, train_target, test_target = train_test_split(data, target, test_size=0.2, random_state=42)"]},{"cell_type":"code","execution_count":null,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"JDKQudr7_8nu","outputId":"b6625aa7-2118-4543-bdcd-d678e84576e3"},"outputs":[{"output_type":"stream","name":"stdout","text":["0.9973541965122431 0.8905151032797809\n"]}],"source":["from sklearn.model_selection import cross_validate\n","from sklearn.ensemble import RandomForestClassifier\n","\n","rf = RandomForestClassifier(n_jobs=-1, random_state=42)\n","scores = cross_validate(rf, train_input, train_target, return_train_score=True, n_jobs=-1)\n","\n","print(np.mean(scores['train_score']), np.mean(scores['test_score']))"]},{"cell_type":"code","execution_count":null,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"XYDbzXNLG8fK","outputId":"17bddd3a-4de6-41c8-9135-af164b021f55"},"outputs":[{"output_type":"stream","name":"stdout","text":["[0.23167441 0.50039841 0.26792718]\n"]}],"source":["rf.fit(train_input, train_target)\n","print(rf.feature_importances_)"]},{"cell_type":"code","execution_count":null,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"oMc06S1Fa_A-","outputId":"dea1c2c9-c2cd-452e-f3d9-a24b678f02d5"},"outputs":[{"output_type":"stream","name":"stdout","text":["0.8934000384837406\n"]}],"source":["rf = RandomForestClassifier(oob_score=True, n_jobs=-1, random_state=42)\n","\n","rf.fit(train_input, train_target)\n","print(rf.oob_score_)"]},{"cell_type":"markdown","metadata":{"id":"KdrVoeQZRU14"},"source":["## 엑스트라트리"]},{"cell_type":"code","execution_count":null,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"noMLdywdOGrE","outputId":"07e18f2b-bb89-46fe-cec2-bf2f43f111b0"},"outputs":[{"output_type":"stream","name":"stdout","text":["0.9974503966084433 0.8887848893166506\n"]}],"source":["from sklearn.ensemble import ExtraTreesClassifier\n","\n","et = ExtraTreesClassifier(n_jobs=-1, random_state=42)\n","scores = cross_validate(et, train_input, train_target, return_train_score=True, n_jobs=-1)\n","\n","print(np.mean(scores['train_score']), np.mean(scores['test_score']))"]},{"cell_type":"code","execution_count":null,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"HnB0_mBqfcXL","outputId":"d4fde47e-766d-484a-b1a4-a982db8ccbb0"},"outputs":[{"output_type":"stream","name":"stdout","text":["[0.20183568 0.52242907 0.27573525]\n"]}],"source":["et.fit(train_input, train_target)\n","print(et.feature_importances_)"]},{"cell_type":"markdown","metadata":{"id":"csKxnaxeRX8s"},"source":["## 그레이디언트 부스팅"]},{"cell_type":"code","execution_count":null,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"_IlNEFkaNsoG","outputId":"9b4b36e3-5b1c-412e-e6c1-d039c389f3e5"},"outputs":[{"output_type":"stream","name":"stdout","text":["0.8881086892152563 0.8720430147331015\n"]}],"source":["from sklearn.ensemble import GradientBoostingClassifier\n","\n","gb = GradientBoostingClassifier(random_state=42)\n","scores = cross_validate(gb, train_input, train_target, return_train_score=True, n_jobs=-1)\n","\n","print(np.mean(scores['train_score']), np.mean(scores['test_score']))"]},{"cell_type":"code","execution_count":null,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"pNpeS8EWpeEi","outputId":"69f7971c-5011-4b03-a867-4284cb3336d5"},"outputs":[{"output_type":"stream","name":"stdout","text":["0.9464595437171814 0.8780082549788999\n"]}],"source":["gb = GradientBoostingClassifier(n_estimators=500, learning_rate=0.2, random_state=42)\n","scores = cross_validate(gb, train_input, train_target, return_train_score=True, n_jobs=-1)\n","\n","print(np.mean(scores['train_score']), np.mean(scores['test_score']))"]},{"cell_type":"code","execution_count":null,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"qD6iWVsGqCAE","outputId":"175b9cf4-5c19-45d4-a622-d84f1f8baa40"},"outputs":[{"output_type":"stream","name":"stdout","text":["[0.15887763 0.6799705  0.16115187]\n"]}],"source":["gb.fit(train_input, train_target)\n","print(gb.feature_importances_)"]},{"cell_type":"markdown","metadata":{"id":"BthW_II9RbLa"},"source":["## 히스토그램 기반 부스팅"]},{"cell_type":"code","execution_count":null,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"_3Ct_NNWQbdA","outputId":"2bccc04e-09d7-407a-95bb-9314b3b1ae23"},"outputs":[{"output_type":"stream","name":"stdout","text":["0.9321723946453317 0.8801241948619236\n"]}],"source":["# 사이킷런 1.0 버전 아래에서는 다음 라인의 주석을 해제하고 실행하세요.\n","# from sklearn.experimental import enable_hist_gradient_boosting\n","from sklearn.ensemble import HistGradientBoostingClassifier\n","\n","hgb = HistGradientBoostingClassifier(random_state=42)\n","scores = cross_validate(hgb, train_input, train_target, return_train_score=True, n_jobs=-1)\n","\n","print(np.mean(scores['train_score']), np.mean(scores['test_score']))"]},{"cell_type":"code","execution_count":null,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"TvlB0GMTS3hn","outputId":"2b446a17-5593-4f19-bc59-4b9a4d908379"},"outputs":[{"output_type":"stream","name":"stdout","text":["[0.08876275 0.23438522 0.08027708]\n"]}],"source":["from sklearn.inspection import permutation_importance\n","\n","hgb.fit(train_input, train_target)\n","result = permutation_importance(hgb, train_input, train_target, n_repeats=10,\n","                                random_state=42, n_jobs=-1)\n","print(result.importances_mean)"]},{"cell_type":"code","execution_count":null,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"S8FfxInn-xBQ","outputId":"cd18c70e-7555-4a4b-80cc-1af876e63304"},"outputs":[{"output_type":"stream","name":"stdout","text":["[0.05969231 0.20238462 0.049     ]\n"]}],"source":["result = permutation_importance(hgb, test_input, test_target, n_repeats=10,\n","                                random_state=42, n_jobs=-1)\n","print(result.importances_mean)"]},{"cell_type":"code","execution_count":null,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"pqplZjh0j2nw","outputId":"3d6d6d84-c29e-4110-849a-a8c2b4c3033f"},"outputs":[{"output_type":"execute_result","data":{"text/plain":["0.8723076923076923"]},"metadata":{},"execution_count":13}],"source":["hgb.score(test_input, test_target)"]},{"cell_type":"markdown","metadata":{"id":"8fz_FrezBezR"},"source":["#### XGBoost"]},{"cell_type":"code","execution_count":null,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"YBYLvOiV6rga","outputId":"a9ad7740-5d4c-48a8-c714-2d6eacfdb20b"},"outputs":[{"output_type":"stream","name":"stdout","text":["0.9558403027491312 0.8782000074035686\n"]}],"source":["from xgboost import XGBClassifier\n","\n","xgb = XGBClassifier(tree_method='hist', random_state=42)\n","scores = cross_validate(xgb, train_input, train_target, return_train_score=True, n_jobs=-1)\n","\n","print(np.mean(scores['train_score']), np.mean(scores['test_score']))"]},{"cell_type":"markdown","metadata":{"id":"zl6nh6DOBd-B"},"source":["#### LightGBM"]},{"cell_type":"code","execution_count":null,"metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"maihlDMP7lmY","outputId":"19176c46-8abe-41d7-d6a2-11e9ade8ae9c"},"outputs":[{"output_type":"stream","name":"stderr","text":["/usr/local/lib/python3.10/dist-packages/dask/dataframe/__init__.py:42: FutureWarning: \n","Dask dataframe query planning is disabled because dask-expr is not installed.\n","\n","You can install it with `pip install dask[dataframe]` or `conda install dask`.\n","This will raise in a future version.\n","\n","  warnings.warn(msg, FutureWarning)\n"]},{"output_type":"stream","name":"stdout","text":["0.935828414851749 0.8801251203079884\n"]}],"source":["from lightgbm import LGBMClassifier\n","\n","lgb = LGBMClassifier(random_state=42)\n","scores = cross_validate(lgb, train_input, train_target, return_train_score=True, n_jobs=-1)\n","\n","print(np.mean(scores['train_score']), np.mean(scores['test_score']))"]}],"metadata":{"colab":{"provenance":[{"file_id":"https://github.com/rickiepark/hg-mldl/blob/master/5-3.ipynb","timestamp":1730103580426}]},"kernelspec":{"display_name":"default:Python","language":"python","name":"conda-env-default-py"},"language_info":{"codemirror_mode":{"name":"ipython","version":3},"file_extension":".py","mimetype":"text/x-python","name":"python","nbconvert_exporter":"python","pygments_lexer":"ipython3","version":"3.9.10"}},"nbformat":4,"nbformat_minor":0}