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reader: use index select #8

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Merged
YassineYousfi merged 1 commit into from
Jul 28, 2026
Merged

reader: use index select #8

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12 changes: 9 additions & 3 deletions gigashuffle/multiprocess.py
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Original file line number Diff line number Diff line change
Expand Up @@ -407,10 +407,16 @@ def initialize_reader(config: DataloaderConfig, proc_idx: int, queue_name: str)


def copy_to_reader_buffer(reader_buffer: Buffer, shuffle_buffer: Buffer, idx_list: list[int]) -> None:
idx = torch.as_tensor(idx_list, dtype=torch.int64)
for buffer_idx in range(len(shuffle_buffer)):
for k in shuffle_buffer[buffer_idx].keys():
reader_buffer[buffer_idx][k][:] = shuffle_buffer[buffer_idx][k][idx_list]
reader_buffer[0][INDEX_KEY].copy_(torch.as_tensor(idx_list))
for key in shuffle_buffer[buffer_idx]:
torch.index_select(
shuffle_buffer[buffer_idx][key],
0,
idx,
out=reader_buffer[buffer_idx][key],
)
reader_buffer[0][INDEX_KEY].copy_(idx)


def send_reader_buffer(ready_q: SimpleQueue[tuple[Buffer, int]], ready_e: Event, reader_buffer: Buffer, proc_idx: int) -> None:
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