48 lines
2.1 KiB
Python
48 lines
2.1 KiB
Python
#!/usr/bin/env python
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# Copyright 2024 The HuggingFace Inc. team. 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 typing import Union
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from torch.utils.data import SubsetRandomSampler
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class EpisodeAwareSampler(SubsetRandomSampler):
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def __init__(
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self,
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episode_data_index: dict,
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episode_indices_to_use: Union[list, None] = None,
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drop_n_first_frames: int = 0,
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drop_n_last_frames: int = 0,
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):
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"""Sampler that optionally incorporates episode boundary information.
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Args:
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episode_data_index (dict): Dictionary with keys 'from' and 'to' containing the start and end indices of each episode.
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episode_indices_to_use (list, optional): List of episode indices to use. If None, all episodes are used. Defaults to None.
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Assumes that episodes are indexed from 0 to N-1.
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drop_n_first_frames (int, optional): Number of frames to drop from the start of each episode. Defaults to 0.
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drop_n_last_frames (int, optional): Number of frames to drop from the end of each episode. Defaults to 0.
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"""
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indices = []
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for episode_idx, (start_index, end_index) in enumerate(
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zip(episode_data_index["from"], episode_data_index["to"], strict=False)
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):
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if episode_indices_to_use is None or episode_idx in episode_indices_to_use:
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indices.extend(
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range(start_index.item() + drop_n_first_frames, end_index.item() - drop_n_last_frames)
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)
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super().__init__(indices)
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