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properly calculate max len

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This commit is contained in:
Wing Lian
2023-08-03 16:12:04 -04:00
parent b2f7bc7ccd
commit 0b01da0713
1 changed files with 4 additions and 3 deletions
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7
src/axolotl/monkeypatch/llama_attn_hijack_flash.py
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@@ -43,7 +43,9 @@ def get_cu_seqlens(attn_mask):
[torch.tensor([0], dtype=torch.int32, device=device), seq_lengths.cumsum(0)]
)
return cu_seqlens.to(dtype=torch.int32)
max_seq_len = (cu_seqlens[1:] - cu_seqlens[:-1]).max()
return cu_seqlens.to(dtype=torch.int32), max_seq_len
def forward(
@@ -119,8 +121,7 @@ def forward(
output = rearrange(output, "(b s) ... -> b s ...", b=bsz)
else:
qkv = rearrange(qkv, "b s ... -> (b s) ...")
max_s = q_len
cu_q_lens = get_cu_seqlens(key_padding_mask)
cu_q_lens, max_s = get_cu_seqlens(key_padding_mask)
output = flash_attn_varlen_qkvpacked_func(
qkv, cu_q_lens, max_s, 0.0, softmax_scale=None, causal=True