# Copyright (c) 2020 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 argparse

import paddle.fluid as fluid
from paddle.fluid.dygraph.parallel import ParallelEnv

import dygraph
from dygraph.cvlibs import manager
from dygraph.utils import get_environ_info
from dygraph.utils import Config
from dygraph.core import evaluate


def parse_args():
    parser = argparse.ArgumentParser(description='Model evaluation')

    # params of evaluate
    parser.add_argument(
        "--config", dest="cfg", help="The config file.", default=None, type=str)
    parser.add_argument(
        '--model_dir',
        dest='model_dir',
        help='The path of model for evaluation',
        type=str,
        default=None)

    return parser.parse_args()


def main(args):
    env_info = get_environ_info()
    places = fluid.CUDAPlace(ParallelEnv().dev_id) \
        if env_info['Paddle compiled with cuda'] and env_info['GPUs used'] \
        else fluid.CPUPlace()

    with fluid.dygraph.guard(places):
        if not args.cfg:
            raise RuntimeError('No configuration file specified.')

        cfg = Config(args.cfg)
        val_dataset = cfg.val_dataset
        if not val_dataset:
            raise RuntimeError(
                'The verification dataset is not specified in the configuration file.'
            )
        evaluate(
            cfg.model,
            val_dataset,
            model_dir=args.model_dir,
            num_classes=val_dataset.num_classes)


if __name__ == '__main__':
    args = parse_args()
    main(args)