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PR #12718 (#12718)

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Amit Garg 2025-02-07 06:22:37 -08:00 committed by GitHub
parent ce26b16268
commit 538fab93cd
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2 changed files with 15 additions and 8 deletions
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18
vllm/model_executor/layers/rotary_embedding.py
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@ -509,15 +509,12 @@ class Phi3LongRoPEScaledRotaryEmbedding(nn.Module):
):
super().__init__()
if rotary_dim != head_size:
raise ValueError(
f"`Phi3LongRoPEScaledRotaryEmbedding` does not support \
rotary_dim != head_size ({rotary_dim}!={head_size}).")
if is_neox_style is False:
raise ValueError(
"`Phi3LongRoPEScaledRotaryEmbedding` only supports neox_style."
)
self.rotary_dim = rotary_dim
self.head_size = head_size
self.max_position_embeddings = max_position_embeddings
self.original_max_position_embeddings = original_max_position_embeddings
@ -557,7 +554,7 @@ class Phi3LongRoPEScaledRotaryEmbedding(nn.Module):
def _compute_inv_freq(self, rescale_factors: List[float]) -> torch.Tensor:
rescale_factors = torch.tensor(rescale_factors, dtype=torch.float32)
inv_freq = 1.0 / (rescale_factors * (self.base**(torch.arange(
0, self.head_size, 2, dtype=torch.float) / self.head_size)))
0, self.rotary_dim, 2, dtype=torch.float) / self.rotary_dim)))
return inv_freq
def _compute_cos_sin_cache(
@ -596,8 +593,15 @@ class Phi3LongRoPEScaledRotaryEmbedding(nn.Module):
cos = cos.repeat(1, 2).unsqueeze(-2)
sin = sin.repeat(1, 2).unsqueeze(-2)
query = query * cos + _rotate_neox(query) * sin
key = key * cos + _rotate_neox(key) * sin
query_rot = query[..., :self.rotary_dim]
query_pass = query[..., self.rotary_dim:]
query_rot = query_rot * cos + _rotate_neox(query_rot) * sin
query = torch.cat((query_rot, query_pass), dim=-1)
key_rot = key[..., :self.rotary_dim]
key_pass = key[..., self.rotary_dim:]
key_rot = key_rot * cos + _rotate_neox(key_rot) * sin
key = torch.cat((key_rot, key_pass), dim=-1)
return query.flatten(-2), key.flatten(-2)

5
vllm/model_executor/models/llama.py
View File

@ -128,6 +128,9 @@ class LlamaAttention(nn.Module):
# MistralConfig has an optional head_dim introduced by Mistral-Nemo
self.head_dim = getattr(config, "head_dim",
self.hidden_size // self.total_num_heads)
# Phi models introduced a partial_rotary_factor parameter in the config
partial_rotary_factor = getattr(config, "partial_rotary_factor", 1)
self.rotary_dim = int(partial_rotary_factor * self.head_dim)
self.q_size = self.num_heads * self.head_dim
self.kv_size = self.num_kv_heads * self.head_dim
self.scaling = self.head_dim**-0.5
@ -159,7 +162,7 @@ class LlamaAttention(nn.Module):
self.rotary_emb = get_rope(
self.head_dim,
rotary_dim=self.head_dim,
rotary_dim=self.rotary_dim,
max_position=max_position_embeddings,
base=rope_theta,
rope_scaling=rope_scaling,