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April 11, 2018 13:35
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train_with_my_mlp.py
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| import matplotlib.pyplot as plt | |
| from sklearn import datasets | |
| from sklearn.preprocessing import OneHotEncoder | |
| from sklearn.preprocessing import StandardScaler | |
| from sklearn.utils import shuffle | |
| from sklearn.model_selection import train_test_split | |
| # アヤメデータセット | |
| iris = datasets.load_iris() | |
| X = iris.data | |
| y = iris.target | |
| # 教師データのonehotエンコーディング | |
| ohe = OneHotEncoder() | |
| Y = ohe.fit_transform(y[:,np.newaxis]).toarray() | |
| # シャッフル | |
| X, Y = shuffle(X, Y, random_state=0) | |
| # トレーニング・テストデータ分割 | |
| X_train, X_test, Y_train, Y_test = train_test_split(X, Y, test_size=0.3, random_state=0) | |
| # 特徴量の標準化 | |
| ss = StandardScaler() | |
| X_train = ss.fit_transform(X_train) | |
| X_test = ss.transform(X_test) | |
| batch_size = int(len(X_train)*0.2) # ミニバッチサイズ | |
| epochs = 100 # エポック数 | |
| mu = 0.05 # 学習率 | |
| # 学習器作成 | |
| clf = MultiLayerPerceptron(hidden_layer_sizes=(10,10,10), activation="relu", random_state=10) | |
| # 学習実施 | |
| clf.fit(X_train, Y_train, batch_size, epochs, mu, validation_data=(X_test, Y_test), verbose=0) | |
| # 結果のプロット | |
| plt.figure(figsize=(10, 7)) | |
| plt.subplot(211) | |
| plt.title("learning log (loss)") | |
| plt.xlabel("epoch") | |
| plt.ylabel("loss") | |
| plt.plot(np.arange(len(clf.loss)), clf.loss, label="train") | |
| plt.plot(np.arange(len(clf.loss)), clf.val_loss, label="test") | |
| plt.legend(loc="best") | |
| plt.grid(True) | |
| plt.subplot(212) | |
| plt.title("learning log (accuracy)") | |
| plt.xlabel("epoch") | |
| plt.ylabel("accuracy") | |
| plt.plot(np.arange(len(clf.loss)), clf.acc, label="train") | |
| plt.plot(np.arange(len(clf.loss)), clf.val_acc, label="test") | |
| plt.legend(loc="best") | |
| plt.grid(True) | |
| plt.tight_layout() | |
| plt.show() | |
| # 正答率 | |
| print("acc_train: "+ str(clf.acc[-1]) + " acc_test: "+ str(clf.val_acc[-1])) |
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