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46 lines
1.5 KiB
46 lines
1.5 KiB
3 years ago
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# Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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import numpy as np
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def rerange_index(batch_size, samples_each_class):
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tmp = np.arange(0, batch_size * batch_size)
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tmp = tmp.reshape(-1, batch_size)
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rerange_index = []
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for i in range(batch_size):
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step = i // samples_each_class
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start = step * samples_each_class
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end = (step + 1) * samples_each_class
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pos_idx = []
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neg_idx = []
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for j, k in enumerate(tmp[i]):
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if j >= start and j < end:
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if j == i:
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pos_idx.insert(0, k)
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else:
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pos_idx.append(k)
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else:
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neg_idx.append(k)
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rerange_index += (pos_idx + neg_idx)
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rerange_index = np.array(rerange_index).astype(np.int32)
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return rerange_index
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