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init support for MLA using Attention kernel
This commit is contained in:
Atream
parent
62011fd63e
commit
bb35dc5b0d
5 changed files with 551 additions and 262 deletions
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@ -21,207 +21,12 @@ from ktransformers.util.custom_gguf import GGUFLoader
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import logging
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from transformers.configuration_utils import PretrainedConfig
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from transformers.cache_utils import Cache
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from flash_attn import flash_attn_with_kvcache, flash_attn_func
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from ktransformers.operators.triton_attention import decode_attention_fwd_grouped
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logger = logging.getLogger("attention")
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class KDeepseekV3Attention(BaseInjectedModule, DeepseekV3Attention):
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"""Multi-headed attention from 'Attention Is All You Need' paper"""
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attn_mask: Optional[torch.Tensor] = None
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def __init__(self,
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key: str,
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gguf_loader : GGUFLoader,
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config: PretrainedConfig,
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orig_module: nn.Module,
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device: str = "cuda",
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chunck_size: int = 1000,
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**kwargs):
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BaseInjectedModule.__init__(self, key, gguf_loader, config, orig_module, device, **kwargs)
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self.orig_module.__init__(orig_module.config,
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orig_module.layer_idx)
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self.chunck_size = chunck_size # TODO, generate chunck_size automatically.
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self.softmax_scale = self.q_head_dim ** (-0.5)
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def get_absorbed(self) -> Tuple[torch.Tensor, torch.Tensor]:
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if not (hasattr(self, 'q_absorb') and hasattr(self, 'out_absorb')):
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kv_b_proj = self.kv_b_proj.weight.view(self.num_heads, -1, self.kv_lora_rank)
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q_absorb = kv_b_proj[:, :self.qk_nope_head_dim, :].reshape(-1, self.kv_lora_rank)
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out_absorb = kv_b_proj[:, self.qk_nope_head_dim:, :].reshape(-1, self.kv_lora_rank)
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self.q_absorb = nn.Linear(self.kv_lora_rank, self.num_heads * self.qk_nope_head_dim,
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bias=False, dtype=q_absorb.dtype, device=q_absorb.device)
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self.q_absorb.weight.data = q_absorb
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self.out_absorb = nn.Linear(self.kv_lora_rank, self.num_heads * self.v_head_dim,
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bias=False, dtype=out_absorb.dtype, device=out_absorb.device)
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self.out_absorb.weight.data = out_absorb
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del self.orig_module.kv_b_proj
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q_absorb = self.q_absorb.weight.view(self.num_heads, self.qk_nope_head_dim, self.kv_lora_rank)
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out_absorb = self.out_absorb.weight.view(self.num_heads, self.v_head_dim, self.kv_lora_rank)
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return q_absorb, out_absorb
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def forward_chunck(
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self,
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hidden_states: torch.Tensor,
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attention_mask: Optional[torch.Tensor] = None,
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position_ids: Optional[torch.LongTensor] = None,
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past_key_value: Optional[Cache] = None,
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output_attentions: bool = False,
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use_cache: bool = False,
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cache_position: Optional[torch.LongTensor] = None,
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**kwargs
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) -> Tuple[torch.Tensor, Optional[torch.Tensor], Optional[Tuple[torch.Tensor]]]:
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bsz, q_len, _ = hidden_states.size()
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if self.q_lora_rank is None:
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q = self.q_proj(hidden_states)
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else:
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q = self.q_b_proj(self.q_a_layernorm(self.q_a_proj(hidden_states)))
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q = q.view(bsz, q_len, self.num_heads, self.q_head_dim).transpose(1, 2)
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q_nope, q_pe = torch.split(
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q, [self.qk_nope_head_dim, self.qk_rope_head_dim], dim=-1
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)
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compressed_kv = self.kv_a_proj_with_mqa(hidden_states)
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compressed_kv, k_pe = torch.split(
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compressed_kv, [self.kv_lora_rank, self.qk_rope_head_dim], dim=-1
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)
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compressed_kv = self.kv_a_layernorm(compressed_kv)
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k_pe = k_pe.view(bsz, q_len, 1, self.qk_rope_head_dim).transpose(1, 2)
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kv_seq_len = k_pe.shape[-2]
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if past_key_value is not None:
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if self.layer_idx is None:
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raise ValueError(
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f"The cache structure has changed since version v4.36. If you are using {self.__class__.__name__} "
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"for auto-regressive decoding with k/v caching, please make sure to initialize the attention class "
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"with a layer index."
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)
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kv_seq_len += past_key_value.get_usable_length(kv_seq_len, self.layer_idx)
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cos, sin = self.rotary_emb(q_pe, position_ids)
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q_pe, k_pe = apply_rotary_pos_emb_v3(q_pe, k_pe, cos, sin)
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if past_key_value is not None:
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cache_kwargs = {"sin": sin, "cos": cos, "cache_position": cache_position} # Specific to RoPE models
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compressed_kv = compressed_kv.unsqueeze(1)
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k_pe, compressed_kv = past_key_value.update(k_pe, compressed_kv, self.layer_idx, cache_kwargs)
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compressed_kv = compressed_kv.squeeze(1)
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#if cache_position is not None:
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# compressed_kv = compressed_kv[:,: cache_position[-1] + 1,:]
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# k_pe = k_pe[:,:,: cache_position[-1] + 1,:]
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q_absorb, out_absorb = self.get_absorbed()
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q_nope = torch.matmul(q_nope, q_absorb)
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attn_weights = (torch.matmul(q_pe, k_pe.mT) + torch.matmul(q_nope, compressed_kv.unsqueeze(-3).mT)) * self.softmax_scale
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"""
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if attn_weights.size() != (bsz, self.num_heads, q_len, kv_seq_len):
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raise ValueError(
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f"Attention weights should be of size {(bsz, self.num_heads, q_len, kv_seq_len)}, but is"
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f" {attn_weights.size()}"
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)
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assert attention_mask is not None
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"""
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if attention_mask is not None:
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"""
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if attention_mask.size() != (bsz, 1, q_len, kv_seq_len):
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raise ValueError(
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f"Attention mask should be of size {(bsz, 1, q_len, kv_seq_len)}, but is {attention_mask.size()}"
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)
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"""
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#causal_mask = attention_mask[:, :, :, : kv_seq_len]
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attn_weights = attn_weights + attention_mask
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# upcast attention to fp32
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attn_weights = nn.functional.softmax(
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attn_weights, dim=-1, dtype=torch.float32
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).to(q_pe.dtype)
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attn_weights = nn.functional.dropout(
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attn_weights, p=self.attention_dropout, training=self.training
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)
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attn_output = torch.einsum('bhql,blc->bhqc', attn_weights, compressed_kv)
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attn_output = torch.matmul(attn_output, out_absorb.mT)
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if attn_output.size() != (bsz, self.num_heads, q_len, self.v_head_dim):
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raise ValueError(
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f"`attn_output` should be of size {(bsz, self.num_heads, q_len, self.v_head_dim)}, but is"
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f" {attn_output.size()}"
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)
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attn_output = attn_output.transpose(1, 2).contiguous()
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attn_output = attn_output.reshape(bsz, q_len, self.num_heads * self.v_head_dim)
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attn_output = self.o_proj(attn_output)
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return attn_output, attn_weights, past_key_value
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def forward(
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self,
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hidden_states: torch.Tensor,
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attention_mask: Optional[torch.Tensor] = None,
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position_ids: Optional[torch.LongTensor] = None,
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past_key_value: Optional[Cache] = None,
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output_attentions: bool = False,
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use_cache: bool = False,
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cache_position: Optional[torch.LongTensor] = None,
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**kwargs,
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) -> Tuple[torch.Tensor, Optional[torch.Tensor], Optional[Tuple[torch.Tensor]]]:
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if "padding_mask" in kwargs:
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warnings.warn(
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"Passing `padding_mask` is deprecated and will be removed in v4.37. Please make sure use `attention_mask` instead.`"
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)
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bsz, q_len, _ = hidden_states.size()
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if q_len <= self.chunck_size:
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return self.forward_chunck(
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hidden_states,
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attention_mask,
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position_ids,
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past_key_value,
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output_attentions,
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use_cache,
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cache_position,
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**kwargs
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)
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assert output_attentions == False, "output_attentions is not supported when using chunked attention"
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attn_output = None
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attn_weight = None
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cur_idx = 0
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while cur_idx < q_len:
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if attention_mask is not None:
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chunk_mask = attention_mask[:, :, cur_idx:min(cur_idx + self.chunck_size, q_len), ...]
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else:
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# generate chunk_mask automatically.
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self.attn_mask = \
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torch.zeros(1, 1, self.chunck_size, past_key_value.max_cache_len, device=hidden_states.device) \
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if self.attn_mask is None \
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else self.attn_mask
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self.attn_mask[:, :, :, cur_idx:min(cur_idx+self.chunck_size, past_key_value.max_cache_len)] = \
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-1e+38 * torch.triu(torch.ones(self.chunck_size, self.chunck_size, device=hidden_states.device), diagonal=1)\
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[:,:min(self.chunck_size, min(past_key_value.max_cache_len-cur_idx, self.chunck_size))]
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self.attn_mask[:, :, :, cur_idx+self.chunck_size:] = -1e+38
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self.attn_mask[:, :, :, :cur_idx] = 0
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chunk_mask = torch.narrow(self.attn_mask, 2, 0, min(self.chunck_size, q_len-cur_idx))
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cur_output, cur_attn_weight = self.forward_chunck(
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hidden_states[:, cur_idx:min(cur_idx + self.chunck_size, q_len), ...],
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chunk_mask,
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position_ids[:, cur_idx:min(cur_idx + self.chunck_size, q_len)],
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past_key_value,
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output_attentions,
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use_cache,
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cache_position[cur_idx:min(cur_idx + self.chunck_size, q_len)],
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**kwargs
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)
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cur_idx += self.chunck_size
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if attn_output is None:
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attn_output = cur_output
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attn_weight = cur_attn_weight
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else:
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attn_output = torch.cat((attn_output, cur_output), dim=-2)
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attn_weight = torch.cat((attn_weight, cur_attn_weight), dim=-2)
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return attn_output, attn_weight, past_key_value
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# V3 MLA is same to V2
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class KDeepseekV2Attention(BaseInjectedModule, DeepseekV2Attention):
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"""Multi-headed attention from 'Attention Is All You Need' paper"""
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attn_mask: Optional[torch.Tensor] = None
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@ -250,7 +55,7 @@ class KDeepseekV2Attention(BaseInjectedModule, DeepseekV2Attention):
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self.out_absorb = nn.Linear(self.kv_lora_rank, self.num_heads * self.v_head_dim,
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bias=False, dtype=out_absorb.dtype, device=out_absorb.device)
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self.out_absorb.weight.data = out_absorb
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del self.orig_module.kv_b_proj
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#del self.orig_module.kv_b_proj
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q_absorb = self.q_absorb.weight.view(self.num_heads, self.qk_nope_head_dim, self.kv_lora_rank)
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out_absorb = self.out_absorb.weight.view(self.num_heads, self.v_head_dim, self.kv_lora_rank)
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return q_absorb, out_absorb
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@ -362,60 +167,129 @@ class KDeepseekV2Attention(BaseInjectedModule, DeepseekV2Attention):
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cache_position: Optional[torch.LongTensor] = None,
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**kwargs,
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) -> Tuple[torch.Tensor, Optional[torch.Tensor], Optional[Tuple[torch.Tensor]]]:
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if "padding_mask" in kwargs:
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warnings.warn(
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"Passing `padding_mask` is deprecated and will be removed in v4.37. Please make sure use `attention_mask` instead.`"
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)
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bsz, q_len, _ = hidden_states.size()
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if q_len <= self.chunck_size:
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return self.forward_chunck(
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hidden_states,
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attention_mask,
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position_ids,
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past_key_value,
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output_attentions,
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use_cache,
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cache_position,
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**kwargs
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)
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bsz, q_len, _ = hidden_states.size()
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assert output_attentions == False, "output_attentions is not supported when using chunked attention"
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attn_output = None
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cur_idx = 0
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while cur_idx < q_len:
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if attention_mask is not None:
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chunk_mask = attention_mask[:, :, cur_idx:min(cur_idx + self.chunck_size, q_len), ...]
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else:
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# generate chunk_mask automatically.
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self.attn_mask = \
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torch.zeros(1, 1, self.chunck_size, past_key_value.max_cache_len, device=hidden_states.device) \
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if self.attn_mask is None \
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else self.attn_mask
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self.attn_mask[:, :, :, cur_idx:min(cur_idx+self.chunck_size, past_key_value.max_cache_len)] = \
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-1e+38 * torch.triu(torch.ones(self.chunck_size, self.chunck_size, device=hidden_states.device), diagonal=1)\
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[:,:min(self.chunck_size, min(past_key_value.max_cache_len-cur_idx, self.chunck_size))]
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self.attn_mask[:, :, :, cur_idx+self.chunck_size:] = -1e+38
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self.attn_mask[:, :, :, :cur_idx] = 0
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chunk_mask = torch.narrow(self.attn_mask, 2, 0, min(self.chunck_size, q_len-cur_idx))
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if self.q_lora_rank is None:
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q = self.q_proj(hidden_states)
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else:
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q = self.q_b_proj(self.q_a_layernorm(self.q_a_proj(hidden_states)))
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q = q.view(bsz, q_len, self.num_heads, self.q_head_dim).transpose(1, 2)
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q_nope, q_pe = torch.split(
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q, [self.qk_nope_head_dim, self.qk_rope_head_dim], dim=-1
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)
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compressed_kv = self.kv_a_proj_with_mqa(hidden_states)
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compressed_kv, k_pe = torch.split(
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compressed_kv, [self.kv_lora_rank, self.qk_rope_head_dim], dim=-1
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)
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compressed_kv = self.kv_a_layernorm(compressed_kv)
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k_pe = k_pe.view(bsz, q_len, 1, self.qk_rope_head_dim).transpose(1, 2)
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compressed_kv = compressed_kv.view(bsz, q_len, 1, self.kv_lora_rank)
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cos, sin = self.rotary_emb(q_pe, position_ids)
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q_pe, k_pe = apply_rotary_pos_emb(q_pe, k_pe, cos, sin)
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k_pe = k_pe.transpose(1, 2) # [bsz, q_len, 1, self.qk_rope_head_dim]
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# decode
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if q_len == 1:
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if past_key_value is not None:
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cache_kwargs = {"sin": sin, "cos": cos, "cache_position": cache_position} # Specific to RoPE models
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k_pe, compressed_kv, page_table = past_key_value.update(k_pe, compressed_kv, self.layer_idx, cache_kwargs)
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# q_nope [bsz, self.num_heads, q_len, self.qk_nope_head_dim]
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# q_absorb [self.num_heads, self.qk_nope_head_dim, self.kv_lora_rank]
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q_absorb, out_absorb = self.get_absorbed()
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q_nope = torch.matmul(q_nope, q_absorb) # batched MM
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# q_nope [bsz, self.num_heads, q_len, self.kv_lora_rank]
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# q_pe [bsz, self.num_heads, q_len, self.qk_rope_head_dim]
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query_states = torch.cat([q_nope, q_pe], dim=-1)
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# k_pe [bsz, q_len, 1, self.qk_rope_head_dim]
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# compressed_kv [bsz, q_len, 1, self.kv_lora_rank]
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key_states = torch.cat([compressed_kv, k_pe], dim=-1)
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query_states = query_states.squeeze(2)
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attn_output = torch.zeros_like(q_nope)
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attn_logits = torch.empty(
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(
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bsz,
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self.num_heads,
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1, #num_kv_splits # follow vLLM, fix it TODO
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self.kv_lora_rank + 1,
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),
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dtype=torch.float32,
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device = attn_output.device
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)
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"""
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print("query_states", torch.isnan(query_states).any())
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print("key_states", torch.isnan(key_states[:,:,0,:]).any())
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print("compressed_kv", torch.isnan(compressed_kv[:,:,0,:]).any())
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print("position_ids", torch.isnan(position_ids).any())
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"""
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# flash attn doesn't support head_dim bigger than 256
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# use vLLM triton attention kernel for MQA
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decode_attention_fwd_grouped(query_states, key_states, compressed_kv, attn_output,
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page_table,
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position_ids.squeeze(0).to(torch.int32), attn_logits,
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1, #num_kv_splits # follow vLLM, fix it TODO
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self.softmax_scale,
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past_key_value.page_size)
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attn_output = torch.matmul(attn_output, out_absorb.mT)
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attn_output = attn_output.transpose(1, 2).contiguous()
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attn_output = attn_output.reshape(bsz, q_len, self.num_heads * self.v_head_dim)
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attn_output = self.o_proj(attn_output)
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#print("attn_output", torch.isnan(attn_output).any())
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return attn_output, None, past_key_value
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else:
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if past_key_value is not None:
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cache_kwargs = {"sin": sin, "cos": cos, "cache_position": cache_position} # Specific to RoPE models
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k_pe.squeeze(0)
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compressed_kv.squeeze(0)
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past_key_value.update(k_pe, compressed_kv, self.layer_idx, cache_kwargs)
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k_pe.unsqueeze(0)
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compressed_kv.unsqueeze(0)
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k_pe = k_pe[:, :q_len]
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compressed_kv = compressed_kv[:, :q_len]
|
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kv = (
|
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self.kv_b_proj(compressed_kv)
|
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.view(bsz, q_len, self.num_heads, self.qk_nope_head_dim + self.v_head_dim)
|
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)
|
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k_nope, value_states = torch.split(kv, [self.qk_nope_head_dim, self.v_head_dim], dim=-1)
|
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query_states = k_pe.new_empty(bsz, self.num_heads, q_len, self.q_head_dim)
|
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query_states[:, :, :, : self.qk_nope_head_dim] = q_nope
|
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query_states[:, :, :, self.qk_nope_head_dim :] = q_pe
|
||||
|
||||
key_states = k_pe.new_empty(bsz, q_len, self.num_heads, self.q_head_dim)
|
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key_states[:, :, :, :self.qk_nope_head_dim] = k_nope
|
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key_states[:, :, :, self.qk_nope_head_dim:] = k_pe
|
||||
|
||||
query_states = query_states.transpose(1, 2)
|
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value_states = value_states.view(bsz, q_len, self.num_heads, self.v_head_dim)
|
||||
value_states_padded = torch.nn.functional.pad(value_states, [0, query_states.shape[-1] - value_states.shape[-1]], value=0)
|
||||
|
||||
attn_output = flash_attn_func(
|
||||
query_states,
|
||||
key_states,
|
||||
value_states_padded,
|
||||
softmax_scale=self.softmax_scale,
|
||||
causal=True,
|
||||
)
|
||||
|
||||
if self.q_head_dim != self.v_head_dim:
|
||||
attn_output = attn_output[:, :, :, : self.v_head_dim]
|
||||
|
||||
attn_output = attn_output.reshape(
|
||||
bsz, q_len, self.num_heads * self.v_head_dim
|
||||
).contiguous()
|
||||
attn_output = self.o_proj(attn_output)
|
||||
return attn_output, None, past_key_value
|
||||
|
||||
cur_output, _, _ = self.forward_chunck(
|
||||
hidden_states[:, cur_idx:min(cur_idx + self.chunck_size, q_len), ...],
|
||||
chunk_mask,
|
||||
position_ids[:, cur_idx:min(cur_idx + self.chunck_size, q_len)],
|
||||
past_key_value,
|
||||
output_attentions,
|
||||
use_cache,
|
||||
cache_position[cur_idx:min(cur_idx + self.chunck_size, q_len)],
|
||||
**kwargs
|
||||
)
|
||||
cur_idx += self.chunck_size
|
||||
if attn_output is None:
|
||||
attn_output = cur_output
|
||||
else:
|
||||
attn_output = torch.cat((attn_output, cur_output), dim=-2)
|
||||
|
||||
return attn_output, None, past_key_value
|
||||
def rotate_half(x):
|
||||
"""Rotates half the hidden dims of the input."""
|
||||
x1 = x[..., : x.shape[-1] // 2]
|
||||
|
|
@ -423,8 +297,6 @@ def rotate_half(x):
|
|||
return torch.cat((-x2, x1), dim=-1)
|
||||
|
||||
|
||||
|
||||
|
||||
class KLlamaAttention(BaseInjectedModule):
|
||||
"""Multi-headed attention from 'Attention Is All You Need' paper"""
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue