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1.Environment情報Python lightgbm feature_importance()エラー?
オペレーティングシステム:Windows Pythonのバージョン:Pythonの2.7.13
2.Errorメッセージ:
とValueError:いいえJSONオブジェクトをデコードすることはできなかった
lgb_train = lgb.Dataset(X_train, y_train)
lgb_eval = lgb.Dataset(X_test, y_test, reference=lgb_train)
params = {
'task':'train',
'boosting':'gbdt',
'objective':'binary',
'metric':{'l2', 'auc'},
'num_leaves': 62,
'learning_rate': 0.05,
'feature_fraction': 0.9,
'bagging_fraction': 0.8,
'bagging_freq': 5,
'verbose': 20
}
gbm = lgb.train(params,
lgb_train,
num_boost_round=250,
valid_sets=lgb_eval)
print('Start predicting...')
y_pred = gbm.predict(X_test, num_iteration=gbm.best_iteration)
y_pred = np.round(y_pred)
print gbm.feature_importance()