#   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.
# pylint: disable=doc-string-missing


def acc(prob, label, threshold):
    # we support prob is the probability for label to be one
    assert len(prob) == len(label)
    total = len(prob)
    right = 0
    for i in range(len(prob)):
        if (prob - threshold) * (label - prob) > 0:
            right += 1
    return float(right) / total
