AttributeError: 'KerasRegressor' object has no attribute 'model' site:stackoverflow.com

def build_classifier(optimizer):
    classifier = Sequential()
    classifier.add(Dense(units = 6, kernel_initializer = 'uniform', 
        activation = 'relu', input_dim = 11))
    classifier.add(Dense(units = 6, kernel_initializer = 'uniform', 
        activation = 'relu'))
    classifier.add(Dense(units = 1, kernel_initializer = 'uniform', 
        activation = 'sigmoid'))
    classifier.compile(optimizer = optimizer, loss = 
        'binary_crossentropy', metrics = ['accuracy'])
    return classifier

classifier = KerasClassifier(build_fn = build_classifier)
parameters = {'batch_size': [25, 32],
          'epochs': [100, 500],
          'optimizer': ['adam', 'rmsprop']}
grid_search = GridSearchCV(estimator = classifier,
                       param_grid = parameters,
                       scoring = 'accuracy',
                       cv = 10)
grid_search = grid_search.fit(X_train, y_train)