You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
51 lines
1.5 KiB
51 lines
1.5 KiB
# Copyright (c) 2021 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. |
|
|
|
import paddle |
|
|
|
|
|
class RepeatDataset(paddle.io.Dataset): |
|
"""A wrapper of repeated dataset. |
|
|
|
The length of repeated dataset will be `times` larger than the original |
|
dataset. This is useful when the data loading time is long but the dataset |
|
is small. Using RepeatDataset can reduce the data loading time between |
|
epochs. |
|
|
|
Args: |
|
dataset (:obj:`Dataset`): The dataset to be repeated. |
|
times (int): Repeat times. |
|
""" |
|
|
|
def __init__(self, dataset, times): |
|
self.dataset = dataset |
|
self.times = times |
|
|
|
self._ori_len = len(self.dataset) |
|
|
|
def __getitem__(self, idx): |
|
"""Get item at each call. |
|
|
|
Args: |
|
idx (int): Index for getting each item. |
|
""" |
|
return self.dataset[idx % self._ori_len] |
|
|
|
def __len__(self): |
|
"""Length of the dataset. |
|
|
|
Returns: |
|
int: Length of the dataset. |
|
""" |
|
return self.times * self._ori_len
|
|
|