MLA layer eliminates redundant index operators

Signed-off-by: huiying <chenhuiying4@huawei.com>

Author: huiyingCCCC

vllm_ascend/attention/attention.py

@@ -1000,6 +1000,10 @@ def __init__(
         self.w_kc = None
         self.w_vc = None
 
+        self.cos = None
+        self.sin = None
+        self.debug_layer_idx = extra_impl_args.get('debug_layer_idx', 0)
+
         self.enable_graph_mode = False
         additional_config = get_current_vllm_config().additional_config
         if additional_config:
@@ -1128,17 +1132,18 @@ def forward(
         q_nope, q_pe = q.split([self.qk_nope_head_dim, self.qk_rope_head_dim],
                                dim=-1)
         if k_pe is None and attn_metadata.decode_metadata:
-            seq_len = self.rotary_emb.max_position_embeddings
-
-            cos = self.rotary_emb.cos_cached[:seq_len].to(dtype=q_pe.dtype)
-            sin = self.rotary_emb.sin_cached[:seq_len].to(dtype=q_pe.dtype)
-            cos = cos[attn_metadata.input_positions]
-            sin = sin[attn_metadata.input_positions]
-            cos = cos[:, None, None, :]
-            sin = sin[:, None, None, :]
-
-            q_pe = self.rope_single(q_pe, cos, sin)
-            k_pe, k_nope = self.exec_kv(hidden_states_or_kv_c_normed, cos, sin,
+            if self.debug_layer_idx == 0 or self.cos is None or self.sin is None:
+                seq_len = self.rotary_emb.max_position_embeddings
+
+                self.cos = self.rotary_emb.cos_cached[:seq_len].to(dtype=q_pe.dtype)
+                self.sin = self.rotary_emb.sin_cached[:seq_len].to(dtype=q_pe.dtype)
+                self.cos = self.cos[attn_metadata.input_positions]
+                self.sin = self.sin[attn_metadata.input_positions]
+                self.cos = self.cos[:, None, None, :]
+                self.sin = self.sin[:, None, None, :]
+
+            q_pe = self.rope_single(q_pe, self.cos, self.sin)
+            k_pe, k_nope = self.exec_kv(hidden_states_or_kv_c_normed, self.cos, self.sin,
                                         kv_cache, attn_metadata.slot_mapping)
         else:
             if k_pe is None:

vllm_ascend/models/deepseek_v2.py

@@ -364,6 +364,9 @@ def __init__(
             mscale = yarn_get_mscale(scaling_factor, float(mscale_all_dim))
             self.scaling = self.scaling * mscale * mscale
 
+        self.prefix = prefix
+        self.debug_layer_idx = int(self.prefix.split(".")[-2])
+
         # In the MLA backend, kv_cache includes both k_c and
         # pe (i.e. decoupled position embeddings). In particular,
         # the concat_and_cache_mla op requires
@@ -392,10 +395,9 @@ def __init__(
             kv_a_layernorm=self.kv_a_layernorm,
             kv_b_proj=self.kv_b_proj,
             o_proj=self.o_proj,
+            debug_layer_idx=self.debug_layer_idx,
         )
 
-        self.prefix = prefix
-        self.debug_layer_idx = int(self.prefix.split(".")[-2])
         self.enable_graph_mode = False
         additional_config = get_current_vllm_config().additional_config
         if additional_config: