#   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.

from __future__ import print_function
import unittest
from test_dist_base import TestDistBase
import os


class TestDistMnist2x2(TestDistBase):
    def _setup_config(self):
        self._sync_mode = True
        self._use_reduce = False

    def test_dist_train(self):
        self.check_with_place("dist_mnist_batch_merge.py", delta=1e-5)

    def check_with_place(self,
                         model_file,
                         delta=1e-3,
                         check_error_log=False,
                         need_envs={}):
        # TODO(typhoonzero): should auto adapt GPU count on the machine.
        required_envs = {
            "PATH": os.getenv("PATH", ""),
            "PYTHONPATH": os.getenv("PYTHONPATH", ""),
            "LD_LIBRARY_PATH": os.getenv("LD_LIBRARY_PATH", ""),
            "FLAGS_fraction_of_gpu_memory_to_use": "0.15",
            "FLAGS_cudnn_deterministic": "1",
        }

        required_envs.update(need_envs)

        if check_error_log:
            required_envs["GLOG_v"] = "7"
            required_envs["GLOG_logtostderr"] = "1"

        no_merge_losses = self._run_local(
            model_file,
            required_envs,
            check_error_log=check_error_log,
            batch_size=4)

        batch_merge_losses = self._run_local(
            model_file,
            required_envs,
            check_error_log=check_error_log,
            batch_size=2,
            batch_merge_repeat=2)
        # Ensure both result have values.
        self.assertGreater(len(no_merge_losses), 1)
        self.assertEqual(len(no_merge_losses), len(batch_merge_losses))


if __name__ == "__main__":
    unittest.main()
