#
#  Copyright 2019 The FATE Authors. All Rights Reserved.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.


class CallbackBase(object):
    def on_train_begin(self, train_data=None, validate_data=None):
        pass

    def on_epoch_begin(self, model, epoch):
        pass

    def on_epoch_end(self, model, epoch):
        pass

    def on_train_end(self, model):
        pass