AttributeError：“顺序”对象没有属性“类_”

Question

我正在尝试校准在 keras 中训练了 883 个类的模型。

# Define model architecture
model = Sequential()
model.add(Dense(512,input_shape=(3,),activation="relu"))
model.add(BatchNormalization())
model.add(Dense(512,activation="relu"))
model.add(BatchNormalization())
model.add(Dense(883,activation="relu"))
model.add(Dense(883,activation="softmax"))

model = load_model("my_model.h5")
calib = CalibratedClassifierCV(model,method="sigmoid",cv="prefit")
calib.fit(X_train,y_train)

我得到了错误

Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sklearn/calibration.py", line 163, in fit
    calibrated_classifier.fit(X, y)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sklearn/calibration.py", line 345, in fit
    df, idx_pos_class = self._preproc(X)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/sklearn/calibration.py", line 312, in _preproc
    transform(self.base_estimator.classes_)
AttributeError: 'Sequential' object has no attribute 'classes_'

model.classes_ 似乎不存在，那我做错了什么？

model.classes_

Traceback (most recent call last):
  File "<input>", line 1, in <module>
AttributeError: 'Sequential' object has no attribute 'classes_'

任何帮助将不胜感激，谢谢

Answer 1

您必须使用 Scikit-learn 包装器。像这样的：

from keras.wrappers.scikit_learn import KerasClassifier

def get_model():
    return load_model("my_model.h5")

model = KerasClassifier(build_fn = get_model, epochs=1, batch_size =10)
cv_model = CalibratedClassifierCV(model, method="sigmoid",cv="prefit")

https://keras.io/scikit-learn-api/

https://keras.io/examples/mnist_sklearn_wrapper/