# Copyright 2020 Huawei Technologies Co., Ltd
#
# 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.
# ============================================================================
"""
######################## eval alexnet example ########################
eval alexnet according to model file:
python eval.py --data_path /YourDataPath --ckpt_path Your.ckpt
"""

import os
import argparse
from src.config import cfg
from src.dataset import create_dataset
from src.alexnet import AlexNet
import mindspore.nn as nn
from mindspore import context
from mindspore.train.serialization import load_checkpoint, load_param_into_net
from mindspore.train import Model
from mindspore.nn.metrics import Accuracy


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='MindSpore AlexNet Example')
    parser.add_argument('--device_target', type=str, default="Ascend", choices=['Ascend', 'GPU'],
                        help='device where the code will be implemented (default: Ascend)')
    parser.add_argument('--dataset_path', type=str, default="./", help='path where the dataset is saved')
    parser.add_argument('--checkpoint_path', type=str, default="./ckpt", help='if is test, must provide\
                        path where the trained ckpt file')
    parser.add_argument('--dataset_sink_mode', type=str, default='True', choices = ['True', 'False'],
                        help='DataSet sink mode is True or False')
    args = parser.parse_args()

    device_id = int(os.getenv('DEVICE_ID'))
    context.set_context(mode=context.GRAPH_MODE, device_target=args.device_target, save_graphs=False, device_id=device_id)
    data_path = args.dataset_path
    dataset_sink_mode = args.dataset_sink_mode=='True'

    network = AlexNet(cfg.num_classes)
    {% if loss=='SoftmaxCrossEntropyWithLogits' %}
    net_loss = nn.SoftmaxCrossEntropyWithLogits(sparse=True, reduction="mean")
    {% elif loss=='SoftmaxCrossEntropyExpand' %}
    net_loss = nn.SoftmaxCrossEntropyExpand(sparse=True)
    {% endif %}
    model = Model(network, loss_fn=net_loss, metrics={"Accuracy": Accuracy()})

    print("============== Starting Testing ==============")
    param_dict = load_checkpoint(args.checkpoint_path)
    load_param_into_net(network, param_dict)
    do_train = False
    ds_eval = create_dataset(data_path=data_path, batch_size=cfg.batch_size, do_train=do_train,
                             target=args.device_target)
    acc = model.eval(ds_eval, dataset_sink_mode=dataset_sink_mode)
    print("============== {} ==============".format(acc))
