GPT OSS Integration Code

vllm_gaudi/attention/backends/hpu_attn.py

@@ -198,6 +198,7 @@ def __init__(
         qk_head_dim: int,
         v_head_dim: int,
         kv_b_proj: ColumnParallelLinear,
+        sinks: Optional[torch.Tensor] = None,
         **kwargs,
     ) -> None:
         torch.nn.Module.__init__(self)
@@ -252,6 +253,11 @@ def __init__(
                                       "encoder/decoder cross-attention "
                                       "are not implemented for "
                                       "TritonMLAImpl")
+        self.sinks = sinks
+        if sinks is not None:
+            assert sinks.shape[0] == num_heads, ("Sinks must have the same number of heads as the number of "
+                                                 f"heads in the layer. Sinks shape: {sinks.shape}, "
+                                                 f"num_heads: {num_heads}.")
 
     def forward(
         self,
@@ -428,6 +434,7 @@ def __init__(
         attn_type: str = AttentionType.DECODER,
         kv_sharing_target_layer_name: Optional[str] = None,
         use_irope: bool = False,
+        sinks: Optional[torch.Tensor] = None,
     ) -> None:
         super(AttentionImpl, self).__init__()
         if kv_sharing_target_layer_name is not None:
@@ -492,6 +499,11 @@ def __init__(
             raise NotImplementedError("Encoder self-attention "
                                       "is not implemented for "
                                       "HPUAttentionImpl")
+        self.sinks = sinks
+        if sinks is not None:
+            assert sinks.shape[0] == num_heads, ("Sinks must have the same number of heads as the number of "
+                                                 f"heads in the layer. Sinks shape: {sinks.shape}, "
+                                                 f"num_heads: {num_heads}.")
 
     def _maybe_init_alibi_biases(
         self,
@@ -576,6 +588,12 @@ def forward(
             # Reshape the input keys and values and store them in the cache.
             # If kv_cache is not provided, the new key and value tensors are
             # not cached. This happens during the initial memory profiling run.
+            if key.dtype != key_cache.dtype:
+                key = key.to(key_cache.dtype)
+            if value.dtype != value_cache.dtype:
+                value = value.to(value_cache.dtype)
+            if query.dtype != key.dtype:
+                query = query.to(key.dtype)
             key_cache = self.k_cache(key, key_cache, slot_mapping, k_scales)
             value_cache = self.v_cache(value, value_cache, slot_mapping, v_scales)
 
@@ -691,6 +709,7 @@ def common_attention_args(self,
             'key_cache': key_cache,
             'value_cache': value_cache,
             'block_size': block_size,
+            "sinks": self.sinks,
             'k_scales': k_scales,
             'v_scales': v_scales,
         }

vllm_gaudi/extension/ops.py

@@ -65,7 +65,7 @@ def matmul_shape(lhs, rhs):
     return result
 
 
-def pipelined_pa(attn, value, block_bias, block_groups, block_mapping, batch_size, matmul_av_op, batch2block_matmul_op,
+def pipelined_pa(attn, value, block_bias, block_groups, block_mapping, sink, batch_size, matmul_av_op, batch2block_matmul_op,
                  block2batch_matmul_op):
     # When fp32_softmax is enabled attn is left in fp32 after Q@K
     # We can return to native dtype after we renormalize and calculate the adjustments
@@ -80,11 +80,27 @@ def pipelined_pa(attn, value, block_bias, block_groups, block_mapping, batch_siz
         if block_bias is not None:
             attn.add_(block_bias)
         block_max = attn.amax(dim=-1, keepdim=True)
+        if sink is not None:
+            block_max = torch.maximum(block_max, sink)
         attn = attn.sub(block_max)
         attn = attn.exp()
         if attn.dtype == torch.float32:
             attn = attn.to(value.dtype)
-        block_sums = attn.sum(dim=-1, keepdim=True)
+        attn_shape = attn.shape
+        block_sums = attn.view(-1, attn_shape[-1]).sum(dim=-1, keepdim=True)
+        attn_shape = list(attn_shape)
+        attn_shape[-1] = 1
+        block_sums = block_sums.view(attn_shape)
+        if sink is not None:
+            attn_sink = sink.sub(block_max)
+            attn_sink = attn_sink.exp()
+            if attn_sink.dtype == torch.float32:
+                attn_sink = attn_sink.to(value.dtype)
+            #TODO: Removing this .sum and using attn_sink directly
+            #results in wrong output which does not make sense.
+            #Looks like a Synapse issue, need to investigate further.
+            block_sums_sink = attn_sink.sum(dim=-1, keepdim=True)
+            block_sums = block_sums + block_sums_sink
     attn = matmul_av_op(attn, value)
     if get_config().fused_block_softmax_adjustment:
         out_shape = list(attn.shape[:3]) + [1] * (attn.dim() - 3)
@@ -177,7 +193,7 @@ def flat_pa_mla(query, key_cache, value_cache, block_list, block_mapping, block_
 
 def flat_pa(query, key_cache, value_cache, block_list, block_mapping, block_bias, block_groups, block_size, scale,
             matmul_qk_op, position_bias, matmul_av_op, batch2block_matmul_op, block2batch_matmul_op, keys_fetch_func,
-            values_fetch_func, k_scales, v_scales, **ignored_args):
+            values_fetch_func, sinks, k_scales, v_scales, **ignored_args):
     batch_size, _, hidden_size = query.shape
     _, kv_heads, head_size = key_cache.shape
     q_heads = hidden_size // head_size
@@ -195,6 +211,13 @@ def flat_pa(query, key_cache, value_cache, block_list, block_mapping, block_bias
     value = values_fetch_func(value_cache.unflatten(0, (-1, block_size)),
                               **get_kv_fetch_extra_args(blocks=block_list, scales=v_scales_uf)).transpose(1, 2)
     block_bias = block_bias.view(key.size(0), 1, 1, -1)
+    sink = None
+    if sinks is not None:
+        sinks = sinks.reshape(sinks.shape[0], 1)
+        sink = sinks.reshape(1, sinks.shape[0], 1, sinks.shape[1])
+        sink = sink.expand(query.shape[0], -1, query.shape[-2], -1)
+        if kv_heads != q_heads:
+            sink = sink.unflatten(1, (kv_heads, -1))
     if kv_heads != q_heads:
         query = query.unflatten(1, (kv_heads, -1))
         key = key.unflatten(1, (kv_heads, 1))
@@ -232,6 +255,7 @@ def flat_pa(query, key_cache, value_cache, block_list, block_mapping, block_bias
                         block_bias,
                         block_groups,
                         block_mapping,
+                        sink,
                         batch_size=batch_size,
                         matmul_av_op=matmul_av_op,
                         batch2block_matmul_op=batch2block_matmul_op,
@@ -290,6 +314,7 @@ def _naive_prompt_attention(query: torch.Tensor,
                             matmul_qk_op=torch.matmul,
                             softmax_op=torch.softmax,
                             matmul_av_op=torch.matmul,
+                            sinks: Optional[torch.Tensor] = None,
                             **ignored_args) -> torch.Tensor:
     query = query.transpose(1, 2)
     key = key.transpose(1, 2)
@@ -321,10 +346,19 @@ def _naive_prompt_attention(query: torch.Tensor,
         if attn_weights.dtype != attn_bias.dtype:
             attn_bias = attn_bias.to(dtype=attn_weights.dtype)
         attn_weights.add_(attn_bias)
+    if sinks is not None:
+        sink = sinks.reshape(1, -1, 1, 1).expand(query.shape[0], -1, query.shape[-2], -1)
+        if query_heads != kv_heads:
+            sink = sink.unflatten(1, (kv_heads, -1))
+        combined_logits = torch.cat([attn_weights, sink], dim=-1)
+        combined_logits = combined_logits - combined_logits.max(dim=-1, keepdim=True).values
+        attn_weights = combined_logits
     if get_config().fp32_softmax:
         attn_weights = torch.softmax(attn_weights, dim=-1)
     else:
         attn_weights = softmax_op(attn_weights, dim=-1)
+    if sinks is not None:
+        attn_weights = attn_weights[..., :-1]
     attn_weights = attn_weights.to(query.dtype)
     attn_weights = matmul_av_op(attn_weights, value)
 
@@ -343,6 +377,7 @@ def _fsdpa_prompt_attention(query: torch.Tensor,
                             attn_bias: Optional[torch.Tensor] = None,
                             valid_seq_lengths: Optional[torch.Tensor] = None,
                             window_size: Optional[int] = None,
+                            sinks: Optional[torch.Tensor] = None,
                             **ignored_args) -> torch.Tensor:
     query = query.transpose(1, 2)
     key = key.transpose(1, 2)
@@ -364,10 +399,16 @@ def _fsdpa_prompt_attention(query: torch.Tensor,
         query, key, value, attn_bias, 0.0, is_causal, scale, softmax_mode, recompute_mode, valid_seq_lengths,
         padding_side
     ]
-    args += [window_size] if window_size else []
+    args += [window_size] if window_size else [None]
+    # use sinks in fsdpa
+    if sinks is not None:
+        args += [sinks]
     attn_weights = fsdpa_op(*args)
 
     attn_weights = attn_weights.transpose(1, 2)
+    if sinks is not None:
+        # TODO - check if we can remove this
+        htcore.mark_step()
     return attn_weights
 
 
@@ -487,6 +528,9 @@ def __init__(self):
     def set_weight(self, w):
         self.weight = w
 
+    def set_bias(self, b):
+        self.bias = b
+
     def forward(self, state, expert_id, w):
         raise NotImplementedError()
 
@@ -498,12 +542,14 @@ def __init__(self,
                  num_total_experts: int,
                  experts_min: int = 0,
                  experts_max: int = 8,
+				 bias = None,
                  dispatch_fn: Callable[[torch.Tensor], torch.Tensor] = None):
         super().__init__()
         self.experts_min = experts_min
         self.experts_max = experts_max
         self.global_num_experts = global_num_experts
         self.num_experts = num_total_experts
+        self.bias = bias
 
         if MAX_EXPERTS_PER_SLICE > 0:
             max_expert_per_slice = MAX_EXPERTS_PER_SLICE
@@ -555,8 +601,9 @@ def __init__(self,
                  num_total_experts: int,
                  experts_min: int = 0,
                  experts_max: int = 8,
+				 bias=None,
                  dispatch_fn: Callable[[torch.Tensor], torch.Tensor] = None):
-        super().__init__(global_num_experts, num_total_experts, experts_min, experts_max, dispatch_fn)
+        super().__init__(global_num_experts, num_total_experts, experts_min, experts_max, bias, dispatch_fn)
         self.w13_list = torch.nn.ModuleList([MoeMatmul() for _ in range(num_total_experts)])
         self.w2_list = torch.nn.ModuleList([MoeMatmul() for _ in range(num_total_experts)])
 
@@ -569,31 +616,62 @@ def forward(self, hidden_states, expert_routing_table, router_weights, permuted_
         w2_list = [self.w2_list[i].weight.squeeze() for i in experts_range]
 
         if self.moe_n_slice == 1:
-            return torch.ops.hpu.mixture_of_experts(hidden_states=hidden_states,
-                                                    expert_routing_table=expert_routing_table,
-                                                    router_weights=router_weights,
-                                                    w12=w1_list,
-                                                    w3=w2_list,
-                                                    permuted_weights=permuted_weights,
-                                                    activation=activation,
-                                                    experts_min=self.experts_min,
-                                                    experts_max=self.experts_max,
-                                                    **kwargs)
+            if self.bias is not None:
+                w1_bias_list = [self.w13_list[i].bias.squeeze() for i in experts_range]
+                w2_bias_list = [self.w2_list[i].bias.squeeze() for i in experts_range]
+                return torch.ops.hpu.mixture_of_experts.bias_fused_weights(hidden_states=hidden_states,
+                                                                           expert_routing_table=expert_routing_table,
+                                                                           router_weights=router_weights,
+                                                                           w12=w1_list,
+                                                                           w3=w2_list,
+                                                                           w12_bias=w1_bias_list,
+                                                                           w3_bias=w2_bias_list,
+                                                                           permuted_weights=permuted_weights,
+                                                                           experts_min=self.experts_min,
+                                                                           experts_max=self.experts_max)
+            else:
+                return torch.ops.hpu.mixture_of_experts(hidden_states=hidden_states,
+                                                        expert_routing_table=expert_routing_table,
+                                                        router_weights=router_weights,
+                                                        w12=w1_list,
+                                                        w3=w2_list,
+                                                        permuted_weights=permuted_weights,
+                                                        activation=activation,
+                                                        experts_min=self.experts_min,
+                                                        experts_max=self.experts_max,
+                                                        **kwargs)
         for i in range(self.moe_n_slice):
             w1_list_slice = w1_list[i * self.num_expert_per_group:(i + 1) * self.num_expert_per_group]
             w2_list_slice = w2_list[i * self.num_expert_per_group:(i + 1) * self.num_expert_per_group]
             min_expert = self.experts_min + i * self.num_expert_per_group
             max_expert = min_expert + self.num_expert_per_group - 1
-            slice_final_hidden_states = torch.ops.hpu.mixture_of_experts(hidden_states=hidden_states,
-                                                                         expert_routing_table=expert_routing_table,
-                                                                         router_weights=router_weights,
-                                                                         w12=w1_list_slice,
-                                                                         w3=w2_list_slice,
-                                                                         permuted_weights=permuted_weights,
-                                                                         activation=activation,
-                                                                         experts_min=min_expert,
-                                                                         experts_max=max_expert,
-                                                                         **kwargs)
+            if self.bias is not None:
+                w1_bias_list = [self.w13_list[i].bias.squeeze() for i in experts_range]
+                w2_bias_list = [self.w2_list[i].bias.squeeze() for i in experts_range]
+                w1_bias_list_slice = w1_bias_list[i * self.num_expert_per_group:(i + 1) * self.num_expert_per_group]
+                w2_bias_list_slice = w2_bias_list[i * self.num_expert_per_group:(i + 1) * self.num_expert_per_group]
+                slice_final_hidden_states = torch.ops.hpu.mixture_of_experts.bias_fused_weights(
+                    hidden_states=hidden_states,
+                    expert_routing_table=expert_routing_table,
+                    router_weights=router_weights,
+                    w12=w1_list,
+                    w3=w2_list,
+                    w12_bias=w1_bias_list_slice,
+                    w3_bias=w2_bias_list_slice,
+                    permuted_weights=permuted_weights,
+                    experts_min=self.experts_min,
+                    experts_max=self.experts_max)
+            else:
+                slice_final_hidden_states = torch.ops.hpu.mixture_of_experts(hidden_states=hidden_states,
+                                                                             expert_routing_table=expert_routing_table,
+                                                                             router_weights=router_weights,
+                                                                             w12=w1_list_slice,
+                                                                             w3=w2_list_slice,
+                                                                             permuted_weights=permuted_weights,
+                                                                             activation=activation,
+                                                                             experts_min=min_expert,
+                                                                             experts_max=max_expert,
+                                                                             **kwargs)
             if i == 0:
                 final_hidden_states = slice_final_hidden_states
             else:

vllm_gaudi/extension/utils.py

@@ -157,14 +157,16 @@ def forward(
         valid_sequence_lengths,
         padding_side="left",
         window_size=None,
+        sinks=None,
     ):
         if window_size is not None:
             return self._hpu_kernel_fsdpa.apply(query, key, value, attn_mask, dropout_p, is_causal, scale, softmax_mode,
                                                 recompute_mode, valid_sequence_lengths, padding_side, False, False,
-                                                window_size)
+                                                window_size, sinks)
         else:
             return self._hpu_kernel_fsdpa.apply(query, key, value, attn_mask, dropout_p, is_causal, scale, softmax_mode,
-                                                recompute_mode, valid_sequence_lengths, padding_side)
+                                                recompute_mode, valid_sequence_lengths, padding_side, False, False,
+                                                (-1, -1), sinks)
 
 
 def pad_list(input, target_len, val_generator):