# Copyright (c) 2018 PaddlePaddle 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.
import contextlib
from paddle.fluid import core
from paddle.fluid import framework

__all__ = ['enabled', 'guard']


def enabled():
    return framework._in_imperative_mode()


@contextlib.contextmanager
def guard():
    train = framework.Program()
    startup = framework.Program()
    with framework.program_guard(train, startup):
        with framework.unique_name.guard():
            with framework._imperative_guard():
                yield
    # TODO: check train, startup not changed.