import torch
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import numpy as np
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from funasr.register import tables
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@tables.register("batch_sampler_classes", "DynamicBatchLocalShuffleSampler")
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class BatchSampler(torch.utils.data.BatchSampler):
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def __init__(self, dataset,
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batch_type: str = "example",
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batch_size: int = 100,
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buffer_size: int = 30,
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drop_last: bool = False,
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shuffle: bool = True,
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**kwargs):
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self.drop_last = drop_last
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self.pre_idx = -1
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self.dataset = dataset
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self.total_samples = len(dataset)
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self.batch_type = batch_type
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self.batch_size = batch_size
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self.buffer_size = buffer_size
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self.max_token_length = kwargs.get("max_token_length", 5000)
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self.shuffle_idx = np.arange(self.total_samples)
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self.shuffle = shuffle
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def __len__(self):
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return self.total_samples
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def set_epoch(self, epoch):
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np.random.seed(epoch)
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def __iter__(self):
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if self.shuffle:
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np.random.shuffle(self.shuffle_idx)
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batch = []
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max_token = 0
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num_sample = 0
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iter_num = (self.total_samples - 1) // self.buffer_size + 1
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# print("iter_num: ", iter_num)
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for iter in range(self.pre_idx + 1, iter_num):
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datalen_with_index = []
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for i in range(self.buffer_size):
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idx = iter * self.buffer_size + i
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if idx >= self.total_samples:
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continue
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idx_map = self.shuffle_idx[idx]
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# prompt = self.dataset.indexed_dataset[idx_map]["prompt"]
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sample_len_cur = self.dataset.get_source_len(idx_map) + \
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self.dataset.get_target_len(idx_map)
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datalen_with_index.append([idx, sample_len_cur])
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datalen_with_index_sort = sorted(datalen_with_index, key=lambda x: x[1])
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for item in datalen_with_index_sort:
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idx, sample_len_cur_raw = item
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if sample_len_cur_raw > self.max_token_length:
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continue
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max_token_cur = max(max_token, sample_len_cur_raw)
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max_token_padding = 1 + num_sample
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if self.batch_type == 'length':
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max_token_padding *= max_token_cur
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if max_token_padding <= self.batch_size:
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batch.append(idx)
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max_token = max_token_cur
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num_sample += 1
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else:
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yield batch
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batch = [idx]
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max_token = sample_len_cur_raw
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num_sample = 1
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