#copyright (c) 2020 PaddlePaddle Authors. All Rights Reserve.
#
#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.

__all__ = ['AverageMeter']


class AverageMeter(object):
    """
    Computes and stores the average and current value
    """

    def __init__(self, name='', fmt=':f', avg=False):
        self.name = name
        self.fmt = fmt
        self.avg_flag = avg
        self.reset()

    def reset(self):
        """ reset """
        self.val = 0
        self.avg = 0
        self.sum = 0
        self.count = 0

    def update(self, val, n=1):
        """ update """
        self.val = val
        self.sum += val * n
        self.count += n
        self.avg = self.sum / self.count

    def __str__(self):
        fmtstr = '[{name}: {val' + self.fmt + '}]'
        if self.avg_flag:
            fmtstr += '[{name}(avg): {avg' + self.fmt + '}]'
        return fmtstr.format(**self.__dict__)
