[BUG] fix local_rank in initialize_dp_attention (#7584)

Author: TomQuartz

python/sglang/srt/layers/dp_attention.py

@@ -79,14 +79,12 @@ def initialize_dp_attention(
     )
 
     if enable_dp_attention:
-        local_rank = tp_rank % (tp_size // dp_size)
         _ATTN_DP_SIZE = dp_size
         if moe_dense_tp_size is None:
             _LOCAL_ATTN_DP_SIZE = _ATTN_DP_SIZE
         else:
             _LOCAL_ATTN_DP_SIZE = max(1, dp_size // (tp_size // moe_dense_tp_size))
     else:
-        local_rank = tp_rank
         _ATTN_DP_SIZE = 1
         _LOCAL_ATTN_DP_SIZE = 1
 
@@ -96,7 +94,7 @@ def initialize_dp_attention(
             list(range(head, head + _ATTN_TP_SIZE))
             for head in range(0, pp_size * tp_size, _ATTN_TP_SIZE)
         ],
-        local_rank,
+        tp_group.local_rank,
         torch.distributed.get_backend(tp_group.device_group),
         use_pynccl=SYNC_TOKEN_IDS_ACROSS_TP,
         use_pymscclpp=False,