[MoE Refactor][7/N] AITER MK (#31102)

Signed-off-by: Robert Shaw <robshaw@redhat.com>
Co-authored-by: Robert Shaw <robshaw@redhat.com>

vllm/model_executor/layers/fused_moe/fused_moe.py

@@ -2132,6 +2132,7 @@ class TritonExperts(mk.FusedMoEPermuteExpertsUnpermute):
             torch.float16,
             torch.bfloat16,
             torch.float8_e4m3fn,
+            torch.float8_e4m3fnuz,
         ]
 
         E, num_tokens, N, K, top_k_num = self.moe_problem_size(
@@ -2156,7 +2157,10 @@ class TritonExperts(mk.FusedMoEPermuteExpertsUnpermute):
             compute_type = tl.float16
         elif hidden_states.dtype == torch.float32:
             compute_type = tl.float32
-        elif hidden_states.dtype == torch.float8_e4m3fn:
+        elif (
+            hidden_states.dtype == torch.float8_e4m3fn
+            or hidden_states.dtype == torch.float8_e4m3fnuz
+        ):
             compute_type = tl.bfloat16
         else:
             raise ValueError(f"Unsupported compute_type: {hidden_states.dtype}")

vllm/model_executor/layers/fused_moe/prepare_finalize.py

@@ -13,6 +13,10 @@ from vllm.model_executor.layers.fused_moe.utils import moe_kernel_quantize_input
 
 
 class MoEPrepareAndFinalizeNoEP(mk.FusedMoEPrepareAndFinalize):
+    def __init__(self, defer_input_quant: bool = False) -> None:
+        super().__init__()
+        self.defer_input_quant = defer_input_quant
+
     @property
     def activation_format(self) -> mk.FusedMoEActivationFormat:
         return mk.FusedMoEActivationFormat.Standard
@@ -48,6 +52,11 @@ class MoEPrepareAndFinalizeNoEP(mk.FusedMoEPrepareAndFinalize):
             # Note: do not use inplace for shared experts overlap
             a1 = a1 * topk_weights.to(a1.dtype)
 
+        # Defer input quant to moe kernel for backends (e.g. AITER, FI)
+        # which use a single kernel call for quant + experts.
+        if self.defer_input_quant:
+            return a1, None, None, None, None
+
         a1q, a1q_scale = moe_kernel_quantize_input(
             a1,
             quant_config.a1_scale,

vllm/model_executor/layers/fused_moe/rocm_aiter_fused_moe.py

@@ -5,11 +5,15 @@ from functools import lru_cache
 
 import torch
 
+import vllm.model_executor.layers.fused_moe.modular_kernel as mk
 from vllm._aiter_ops import rocm_aiter_ops
 from vllm.model_executor.layers.fused_moe.config import (
     FUSED_MOE_UNQUANTIZED_CONFIG,
     FusedMoEQuantConfig,
 )
+from vllm.model_executor.layers.fused_moe.topk_weight_and_reduce import (
+    TopKWeightAndReduceNoOP,
+)
 
 
 class QuantMethod(IntEnum):
@@ -263,3 +267,78 @@ def rocm_aiter_fused_experts(
             a2_scale=quant_config.a2_scale,
             doweight_stage1=apply_router_weight_on_input,
         )
+
+
+class AiterExperts(mk.FusedMoEPermuteExpertsUnpermute):
+    def __init__(self, quant_config):
+        super().__init__(quant_config)
+
+    @property
+    def activation_formats(
+        self,
+    ) -> tuple[mk.FusedMoEActivationFormat, mk.FusedMoEActivationFormat]:
+        return (
+            mk.FusedMoEActivationFormat.Standard,
+            mk.FusedMoEActivationFormat.Standard,
+        )
+
+    def supports_expert_map(self):
+        return True
+
+    def supports_chunking(self):
+        return False
+
+    def finalize_weight_and_reduce_impl(self) -> mk.TopKWeightAndReduce:
+        return TopKWeightAndReduceNoOP()
+
+    def workspace_shapes(
+        self,
+        M: int,
+        N: int,
+        K: int,
+        topk: int,
+        global_num_experts: int,
+        local_num_experts: int,
+        expert_tokens_meta: mk.ExpertTokensMetadata | None,
+    ) -> tuple[tuple[int, ...], tuple[int, ...], tuple[int, ...]]:
+        # Workspaces are managed internally by AITER.
+        workspace1 = (0,)
+        workspace2 = (0,)
+        output = (M, K)
+        return (workspace1, workspace2, output)
+
+    def apply(
+        self,
+        output: torch.Tensor,
+        hidden_states: torch.Tensor,
+        w1: torch.Tensor,
+        w2: torch.Tensor,
+        topk_weights: torch.Tensor,
+        topk_ids: torch.Tensor,
+        activation: str,
+        global_num_experts: int,
+        expert_map: torch.Tensor | None,
+        a1q_scale: torch.Tensor | None,
+        a2_scale: torch.Tensor | None,
+        workspace13: torch.Tensor,
+        workspace2: torch.Tensor,
+        expert_tokens_meta: mk.ExpertTokensMetadata | None,
+        apply_router_weight_on_input: bool,
+    ):
+        assert a1q_scale is None
+        assert a2_scale is None
+        assert expert_tokens_meta is None
+
+        result = rocm_aiter_fused_experts(
+            hidden_states=hidden_states,
+            w1=w1,
+            w2=w2,
+            topk_weights=topk_weights,
+            topk_ids=topk_ids,
+            activation=activation,
+            apply_router_weight_on_input=apply_router_weight_on_input,
+            expert_map=expert_map,
+            quant_config=self.quant_config,
+        )
+        assert result.shape == output.shape
+        output.copy_(result)

vllm/model_executor/layers/quantization/fp8.py

@@ -117,6 +117,7 @@ class Fp8MoeBackend(Enum):
     DEEPGEMM = 3
     MARLIN = 4
     TRITON = 5
+    AITER = 6
 
 
 def get_fp8_moe_backend(
@@ -189,6 +190,10 @@ def get_fp8_moe_backend(
             logger.info_once("Using DeepGEMM backend for FP8 MoE", scope="local")
             return Fp8MoeBackend.DEEPGEMM
 
+    if envs.VLLM_ROCM_USE_AITER and envs.VLLM_ROCM_USE_AITER_MOE:
+        logger.info_once("Using ROCm AITER backend for FP8 MoE", scope="local")
+        return Fp8MoeBackend.AITER
+
     # default to Triton
     logger.info_once("Using Triton backend for FP8 MoE")
     return Fp8MoeBackend.TRITON
@@ -888,16 +893,10 @@ class Fp8MoEMethod(FusedMoEMethodBase):
             layer.w13_input_scale = None
             layer.w2_input_scale = None
 
-        self.rocm_aiter_moe_enabled = False
-
     def process_weights_after_loading(self, layer: Module) -> None:
         if getattr(layer, "_already_called_process_weights_after_loading", False):
             return
 
-        # Lazy import to avoid importing triton too early.
-
-        self.rocm_aiter_moe_enabled = rocm_aiter_ops.is_fused_moe_enabled()
-
         # TODO (rob): refactor block quant into separate class.
         if self.block_quant:
             assert self.quant_config.activation_scheme == "dynamic"
@@ -932,7 +931,7 @@ class Fp8MoEMethod(FusedMoEMethodBase):
             replace_parameter(layer, "w13_weight_scale_inv", w13_weight_scale_inv)
             replace_parameter(layer, "w2_weight", w2_weight)
             replace_parameter(layer, "w2_weight_scale_inv", w2_weight_scale_inv)
-            if self.rocm_aiter_moe_enabled:
+            if self.fp8_backend == Fp8MoeBackend.AITER:
                 # reshaping weights is required for aiter moe kernel.
                 shuffled_w13, shuffled_w2 = rocm_aiter_ops.shuffle_weights(
                     layer.w13_weight.data, layer.w2_weight.data
@@ -1026,7 +1025,7 @@ class Fp8MoEMethod(FusedMoEMethodBase):
                     )
                     start += shard_size
 
-            if self.rocm_aiter_moe_enabled:
+            if self.fp8_backend == Fp8MoeBackend.AITER:
                 shuffled_w13, shuffled_w2 = rocm_aiter_ops.shuffle_weights(
                     layer.w13_weight, layer.w2_weight
                 )
@@ -1072,6 +1071,8 @@ class Fp8MoEMethod(FusedMoEMethodBase):
             self.moe_quant_config = config
 
             self.kernel = mk.FusedMoEModularKernel(
+                # TODO(rob): we can use the generic MoEPrepareAndFinalizeNoEP
+                # with the changes to defer input quantization
                 FlashInferAllGatherMoEPrepareAndFinalize(
                     use_dp=(self.moe.dp_size > 1),
                     use_deepseek_fp8_block_scale=self.block_quant,
@@ -1093,6 +1094,7 @@ class Fp8MoEMethod(FusedMoEMethodBase):
             Fp8MoeBackend.DEEPGEMM,
             Fp8MoeBackend.TRITON,
             Fp8MoeBackend.MARLIN,
+            Fp8MoeBackend.AITER,
         ]:
             from vllm.model_executor.layers.fused_moe import (
                 TritonOrDeepGemmExperts,
@@ -1103,24 +1105,33 @@ class Fp8MoEMethod(FusedMoEMethodBase):
             from vllm.model_executor.layers.fused_moe.prepare_finalize import (
                 MoEPrepareAndFinalizeNoEP,
             )
+            from vllm.model_executor.layers.fused_moe.rocm_aiter_fused_moe import (
+                AiterExperts,
+            )
 
             config = self.get_fused_moe_quant_config(layer)
             assert config is not None
             self.moe_quant_config = config
-            use_marlin = self.fp8_backend == Fp8MoeBackend.MARLIN
-            allow_deep_gemm = self.fp8_backend == Fp8MoeBackend.DEEPGEMM
-            moe_kernel = (
-                MarlinExperts(quant_config=self.moe_quant_config)
-                if use_marlin
-                else TritonOrDeepGemmExperts(
-                    quant_config=self.moe_quant_config,
-                    allow_deep_gemm=allow_deep_gemm,
-                )
-            )
 
-            self.kernel = mk.FusedMoEModularKernel(
-                MoEPrepareAndFinalizeNoEP(), moe_kernel
-            )
+            if self.fp8_backend == Fp8MoeBackend.AITER:
+                self.kernel = mk.FusedMoEModularKernel(
+                    # TODO: make defer_input_quant an attr of the AiterExperts
+                    MoEPrepareAndFinalizeNoEP(defer_input_quant=True),
+                    AiterExperts(quant_config=self.moe_quant_config),
+                )
+            elif self.fp8_backend == Fp8MoeBackend.MARLIN:
+                self.kernel = mk.FusedMoEModularKernel(
+                    MoEPrepareAndFinalizeNoEP(),
+                    MarlinExperts(quant_config=self.moe_quant_config),
+                )
+            else:
+                self.kernel = mk.FusedMoEModularKernel(
+                    MoEPrepareAndFinalizeNoEP(),
+                    TritonOrDeepGemmExperts(
+                        quant_config=self.moe_quant_config,
+                        allow_deep_gemm=(self.fp8_backend == Fp8MoeBackend.DEEPGEMM),
+                    ),
+                )
             self.use_inplace = True
 
     def maybe_make_prepare_finalize(
@@ -1128,7 +1139,7 @@ class Fp8MoEMethod(FusedMoEMethodBase):
         routing_tables: tuple[torch.Tensor, torch.Tensor, torch.Tensor] | None = None,
     ) -> mk.FusedMoEPrepareAndFinalize | None:
         if (
-            self.rocm_aiter_moe_enabled
+            self.fp8_backend == Fp8MoeBackend.AITER
             or self.fp8_backend == Fp8MoeBackend.MARLIN
             or self.flashinfer_moe_backend == FlashinferMoeBackend.TENSORRT_LLM
         ):
@@ -1161,11 +1172,10 @@ class Fp8MoEMethod(FusedMoEMethodBase):
             TritonOrDeepGemmExperts,
         )
 
-        assert (
-            self.fp8_backend != Fp8MoeBackend.MARLIN
-        ) and not self.rocm_aiter_moe_enabled, (
-            "Marlin and ROCm AITER are not supported with all2all yet."
-        )
+        if self.fp8_backend in [Fp8MoeBackend.MARLIN, Fp8MoeBackend.AITER]:
+            raise NotImplementedError(
+                "Marlin and ROCm AITER are not supported with all2all yet."
+            )
 
         assert self.moe_quant_config is not None
 
@@ -1313,37 +1323,18 @@ class Fp8MoEMethod(FusedMoEMethodBase):
             hidden_states=x,
             router_logits=router_logits,
         )
-
-        if self.rocm_aiter_moe_enabled:
-            from vllm.model_executor.layers.fused_moe.rocm_aiter_fused_moe import (  # noqa: E501
-                rocm_aiter_fused_experts,
-            )
-
-            # TODO(rob): convert this to MK.
-            result = rocm_aiter_fused_experts(
-                x,
-                layer.w13_weight,
-                layer.w2_weight,
-                topk_weights=topk_weights,
-                topk_ids=topk_ids,
-                activation=layer.activation,
-                apply_router_weight_on_input=layer.apply_router_weight_on_input,
-                expert_map=layer.expert_map,
-                quant_config=self.moe_quant_config,
-            )
-        else:
-            result = self.kernel(
-                x,
-                layer.w13_weight,
-                layer.w2_weight,
-                topk_weights,
-                topk_ids,
-                inplace=self.use_inplace,
-                activation=layer.activation,
-                global_num_experts=layer.global_num_experts,
-                expert_map=layer.expert_map,
-                apply_router_weight_on_input=layer.apply_router_weight_on_input,
-            )
+        result = self.kernel(
+            x,
+            layer.w13_weight,
+            layer.w2_weight,
+            topk_weights,
+            topk_ids,
+            inplace=self.use_inplace,
+            activation=layer.activation,
+            global_num_experts=layer.global_num_experts,
+            expert_map=layer.expert_map,
+            apply_router_weight_on_input=layer.apply_router_weight_on_input,
+        )
 
         return result
 
@@ -1456,15 +1447,10 @@ class Fp8OnlineMoEMethod(Fp8MoEMethod):
         layer.w13_input_scale = None
         layer.w2_input_scale = None
 
-        self.rocm_aiter_moe_enabled = False
-
     def process_weights_after_loading(self, layer: Module) -> None:
         if getattr(layer, "_already_called_process_weights_after_loading", False):
             return
 
-        # Lazy import to avoid importing triton too early.
-        self.rocm_aiter_moe_enabled = rocm_aiter_ops.is_fused_moe_enabled()
-
         # If checkpoint is fp16, quantize in place.
         fp8_dtype = current_platform.fp8_dtype()
         w13_weight = torch.empty_like(layer.w13_weight.data, dtype=fp8_dtype)
@@ -1481,7 +1467,7 @@ class Fp8OnlineMoEMethod(Fp8MoEMethod):
         replace_parameter(layer, "w2_weight", w2_weight)
 
         # Reshuffle weights for AITER if needed.
-        if self.rocm_aiter_moe_enabled:
+        if self.fp8_backend == Fp8MoeBackend.AITER:
             shuffled_w13, shuffled_w2 = rocm_aiter_ops.shuffle_weights(
                 layer.w13_weight, layer.w2_weight
             )
@@ -1489,7 +1475,7 @@ class Fp8OnlineMoEMethod(Fp8MoEMethod):
             replace_parameter(layer, "w2_weight", shuffled_w2)
 
         # Rushuffle weights for MARLIN if needed.
-        if self.fp8_backend == Fp8MoeBackend.MARLIN:
+        elif self.fp8_backend == Fp8MoeBackend.MARLIN:
             prepare_moe_fp8_layer_for_marlin(
                 layer, False, input_dtype=self.marlin_input_dtype
             )