Remove nested directory: BitTransformerLM/full_bits_train.py
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BitTransformerLM/full_bits_train.py
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import pathlib
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import torch
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from bit_transformer import BitTransformerLM
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DATA_PATH = pathlib.Path('full_bits.pt')
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class BitSeq(torch.utils.data.IterableDataset):
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def __init__(self, path: str | pathlib.Path = DATA_PATH, seq: int = 2048) -> None:
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self.bits = torch.load(path, mmap=True)
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self.seq = seq
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def __len__(self) -> int:
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return (self.bits.numel() // self.seq) - 1
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def __iter__(self):
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N = (self.bits.numel() // self.seq) - 1
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for i in range(N):
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s = i * self.seq
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yield (
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self.bits[s:s+self.seq].long(),
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self.bits[s+1:s+self.seq+1].long(),
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)
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def main() -> None:
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dl = torch.utils.data.DataLoader(
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BitSeq(DATA_PATH, seq=2048),
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batch_size=8,
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num_workers=0,
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pin_memory=False,
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)
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model = BitTransformerLM(
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d_model=64,
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nhead=4,
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num_layers=2,
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dim_feedforward=256,
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max_seq_len=2048,
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reversible=True,
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use_autocast=True,
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)
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loss_fn = torch.nn.CrossEntropyLoss()
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xb, yb = next(iter(dl))
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logits, _ = model(xb)
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pred = logits.reshape(-1, 2)
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target = yb.reshape(-1)
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loss = loss_fn(pred, target)
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print('Batch loss:', float(loss))
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if __name__ == '__main__':
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main()
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