[Refactor] Refactor MOE NVFP4 Code Base: ModelOpt + Compressed Tensor (#21631)

Signed-off-by: yewentao256 <zhyanwentao@126.com>

tests/quantization/test_compressed_tensors.py

@@ -17,7 +17,9 @@ from vllm.model_executor.layers.quantization.compressed_tensors.compressed_tenso
     CompressedTensorsW4A4Fp4, CompressedTensorsW4A16Fp4,
     CompressedTensorsW4A16Sparse24, CompressedTensorsW8A8Fp8,
     CompressedTensorsW8A8Int8, CompressedTensorsW8A16Fp8,
-    CompressedTensorsWNA16, cutlass_fp4_supported)
+    CompressedTensorsWNA16)
+from vllm.model_executor.layers.quantization.utils.quant_utils import (
+    cutlass_fp4_supported)
 from vllm.model_executor.layers.quantization.utils.w8a8_utils import (
     sparse_cutlass_supported)
 from vllm.platforms import current_platform

vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors.py

@@ -33,7 +33,7 @@ from vllm.model_executor.layers.quantization.compressed_tensors.utils import (
     find_matched_target, is_activation_quantization_format,
     should_ignore_layer)
 from vllm.model_executor.layers.quantization.kv_cache import BaseKVCacheMethod
-from vllm.model_executor.layers.quantization.utils.nvfp4_emulation_utils import (  # noqa: E501
+from vllm.model_executor.layers.quantization.utils.quant_utils import (
     cutlass_fp4_supported)
 from vllm.platforms import current_platform
 

vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors_moe.py

@@ -27,8 +27,8 @@ from vllm.model_executor.layers.quantization.utils.marlin_utils_fp4 import (
     prepare_moe_fp4_layer_for_marlin)
 from vllm.model_executor.layers.quantization.utils.marlin_utils_fp8 import (
     prepare_moe_fp8_layer_for_marlin)
-from vllm.model_executor.layers.quantization.utils.nvfp4_emulation_utils import (  # noqa: E501
-    cutlass_fp4_supported)
+from vllm.model_executor.layers.quantization.utils.quant_utils import (
+    cutlass_fp4_supported, swizzle_blockscale)
 from vllm.model_executor.layers.quantization.utils.w8a8_utils import (
     all_close_1d, normalize_e4m3fn_to_e4m3fnuz, per_tensor_dequantize)
 from vllm.model_executor.utils import set_weight_attrs
@@ -193,29 +193,6 @@ class CompressedTensorsW4A4MoeMethod(CompressedTensorsMoEMethod):
             {"quant_method": FusedMoeWeightScaleSupported.TENSOR.value})
         set_weight_attrs(w2_input_scale, extra_weight_attrs)
 
-    def swizzle_blockscale(self, scale: torch.tensor):
-        assert (scale.dtype == torch.float8_e4m3fn)
-        # Pad and blockwise interleave weight_scale
-        scale_ndim = scale.ndim
-        if scale.ndim == 2:
-            scale = scale.unsqueeze(0)
-        assert scale.ndim == 3
-        B, M, K = scale.shape
-        round_up_multiple = lambda x, m: (x + m - 1) // m * m
-        M_padded = round_up_multiple(M, 128)
-        K_padded = round_up_multiple(K, 4)
-        padded_scale = torch.zeros((B, M_padded, K_padded), dtype=scale.dtype)
-        padded_scale[:B, :M, :K] = scale
-        batches, rows, cols = padded_scale.shape
-        assert rows % 128 == 0
-        assert cols % 4 == 0
-        padded_scale = padded_scale.reshape(batches, rows // 128, 4, 32,
-                                            cols // 4, 4)
-        swizzled_scale = padded_scale.permute((0, 1, 4, 3, 2, 5))
-        swizzled_scale = swizzled_scale.contiguous().cuda()
-        return (swizzled_scale.reshape(M, K)
-                if scale_ndim == 2 else swizzled_scale.reshape(B, M, K))
-
     def process_weights_after_loading(self, layer: torch.nn.Module) -> None:
 
         # From packed to weight
@@ -243,13 +220,13 @@ class CompressedTensorsW4A4MoeMethod(CompressedTensorsMoEMethod):
             return
 
         # swizzle weight scales
-        layer.w13_blockscale_swizzled = torch.nn.Parameter(
-            self.swizzle_blockscale(layer.w13_weight_scale),
-            requires_grad=False)
+        layer.w13_blockscale_swizzled = torch.nn.Parameter(swizzle_blockscale(
+            layer.w13_weight_scale),
+                                                           requires_grad=False)
 
-        layer.w2_blockscale_swizzled = torch.nn.Parameter(
-            self.swizzle_blockscale(layer.w2_weight_scale),
-            requires_grad=False)
+        layer.w2_blockscale_swizzled = torch.nn.Parameter(swizzle_blockscale(
+            layer.w2_weight_scale),
+                                                          requires_grad=False)
 
         # w13
         w13_input_global_scale = layer.w13_input_global_scale.max(

vllm/model_executor/layers/quantization/modelopt.py

@@ -9,8 +9,7 @@ from torch.nn.parameter import Parameter
 
 import vllm.envs as envs
 import vllm.model_executor.layers.fused_moe.modular_kernel as mk
-from vllm._custom_ops import (cutlass_scaled_fp4_mm,
-                              cutlass_scaled_mm_supports_fp4, scaled_fp4_quant)
+from vllm._custom_ops import cutlass_scaled_fp4_mm, scaled_fp4_quant
 from vllm.distributed import get_ep_group
 from vllm.logger import init_logger
 from vllm.model_executor.layers.fused_moe.config import FusedMoEParallelConfig
@@ -28,7 +27,7 @@ from vllm.model_executor.layers.quantization.utils.marlin_utils_fp4 import (
     apply_fp4_marlin_linear, is_fp4_marlin_supported,
     prepare_fp4_layer_for_marlin, prepare_moe_fp4_layer_for_marlin)
 from vllm.model_executor.layers.quantization.utils.quant_utils import (
-    GroupShape, is_layer_skipped)
+    GroupShape, cutlass_fp4_supported, is_layer_skipped, swizzle_blockscale)
 from vllm.model_executor.layers.quantization.utils.w8a8_utils import (
     Fp8LinearOp, requantize_with_max_scale)
 from vllm.model_executor.parameter import (ModelWeightParameter,
@@ -667,14 +666,6 @@ class ModelOptNvFp4Config(QuantizationConfig):
         return None
 
 
-def cutlass_fp4_supported() -> bool:
-    if not current_platform.is_cuda():
-        return False
-    capability_tuple = current_platform.get_device_capability()
-    capability = -1 if capability_tuple is None else capability_tuple.to_int()
-    return cutlass_scaled_mm_supports_fp4(capability)
-
-
 class ModelOptFp8KVCacheMethod(BaseKVCacheMethod):
     """
     Supports loading kv-cache scaling factors from FP8 checkpoints.
@@ -772,29 +763,6 @@ class ModelOptNvFp4LinearMethod(LinearMethodBase):
 
         layer.register_parameter("weight_scale", weight_scale)
 
-    def swizzle_blockscale(self, scale: torch.tensor):
-        assert (scale.dtype == torch.float8_e4m3fn)
-        # Pad and blockwise interleave weight_scale
-        scale_ndim = scale.ndim
-        if scale.ndim == 2:
-            scale = scale.unsqueeze(0)
-        assert scale.ndim == 3
-        B, M, K = scale.shape
-        round_up_multiple = lambda x, m: (x + m - 1) // m * m
-        M_padded = round_up_multiple(M, 128)
-        K_padded = round_up_multiple(K, 4)
-        padded_scale = torch.zeros((B, M_padded, K_padded), dtype=scale.dtype)
-        padded_scale[:B, :M, :K] = scale
-        batches, rows, cols = padded_scale.shape
-        assert rows % 128 == 0
-        assert cols % 4 == 0
-        padded_scale = padded_scale.reshape(batches, rows // 128, 4, 32,
-                                            cols // 4, 4)
-        swizzled_scale = padded_scale.permute((0, 1, 4, 3, 2, 5))
-        swizzled_scale = swizzled_scale.contiguous().cuda()
-        return (swizzled_scale.reshape(M, K)
-                if scale_ndim == 2 else swizzled_scale.reshape(B, M, K))
-
     def process_weights_after_loading(self, layer: Module) -> None:
 
         # global scales:
@@ -814,7 +782,7 @@ class ModelOptNvFp4LinearMethod(LinearMethodBase):
             "Expected weight_scale.dim(1) to be divisible by 16")
         assert (layer.weight_scale.dtype == torch.float8_e4m3fn), (
             "Weight Block scale must be represented as FP8-E4M3")
-        swizzled_weight_scale = self.swizzle_blockscale(layer.weight_scale)
+        swizzled_weight_scale = swizzle_blockscale(layer.weight_scale)
 
         layer.weight_scale_swizzled = Parameter(swizzled_weight_scale,
                                                 requires_grad=False)
@@ -1060,29 +1028,6 @@ class ModelOptNvFp4FusedMoE(FusedMoEMethodBase):
                                                  weight_loader=weight_loader)
         layer.register_parameter("w2_input_scale", w2_input_scale)
 
-    def swizzle_blockscale(self, scale: torch.tensor):
-        assert (scale.dtype == torch.float8_e4m3fn)
-        # Pad and blockwise interleave weight_scale
-        scale_ndim = scale.ndim
-        if scale.ndim == 2:
-            scale = scale.unsqueeze(0)
-        assert scale.ndim == 3
-        B, M, K = scale.shape
-        round_up_multiple = lambda x, m: (x + m - 1) // m * m
-        M_padded = round_up_multiple(M, 128)
-        K_padded = round_up_multiple(K, 4)
-        padded_scale = torch.zeros((B, M_padded, K_padded), dtype=scale.dtype)
-        padded_scale[:B, :M, :K] = scale
-        batches, rows, cols = padded_scale.shape
-        assert rows % 128 == 0
-        assert cols % 4 == 0
-        padded_scale = padded_scale.reshape(batches, rows // 128, 4, 32,
-                                            cols // 4, 4)
-        swizzled_scale = padded_scale.permute((0, 1, 4, 3, 2, 5))
-        swizzled_scale = swizzled_scale.contiguous().cuda()
-        return (swizzled_scale.reshape(M, K)
-                if scale_ndim == 2 else swizzled_scale.reshape(B, M, K))
-
     def process_weights_after_loading(self, layer: torch.nn.Module) -> None:
         # GEMM 1
         # The FlashInfer Cutlass fused MoE kernel expects the combined weights
@@ -1128,8 +1073,7 @@ class ModelOptNvFp4FusedMoE(FusedMoEMethodBase):
             "Expected weight_scale.dim(1) to be divisible by 16")
         assert (layer.w13_weight_scale.dtype == torch.float8_e4m3fn), (
             "Weight Blockscale must be represented as FP8-E4M3")
-        w13_blockscale_swizzled = self.swizzle_blockscale(
-            layer.w13_weight_scale)
+        w13_blockscale_swizzled = swizzle_blockscale(layer.w13_weight_scale)
 
         layer.w13_blockscale_swizzled = Parameter(w13_blockscale_swizzled,
                                                   requires_grad=False)
@@ -1151,7 +1095,7 @@ class ModelOptNvFp4FusedMoE(FusedMoEMethodBase):
             "Expected weight_scale.dim(1) to be divisible by 16")
         assert (layer.w2_weight_scale.dtype == torch.float8_e4m3fn), (
             "Weight Blockscale must be represented as FP8-E4M3")
-        w2_blockscale_swizzled = self.swizzle_blockscale(layer.w2_weight_scale)
+        w2_blockscale_swizzled = swizzle_blockscale(layer.w2_weight_scale)
 
         layer.w2_blockscale_swizzled = Parameter(w2_blockscale_swizzled,
                                                  requires_grad=False)

vllm/model_executor/layers/quantization/utils/nvfp4_emulation_utils.py

@@ -2,13 +2,12 @@
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 import torch
 
-from vllm._custom_ops import cutlass_scaled_mm_supports_fp4
-from vllm.platforms import current_platform
 from vllm.scalar_type import scalar_types
 
 __all__ = [
-    "break_fp4_bytes", "dequantize_to_dtype", "ref_nvfp4_quant",
-    "cutlass_fp4_supported"
+    "break_fp4_bytes",
+    "dequantize_to_dtype",
+    "ref_nvfp4_quant",
 ]
 
 FLOAT4_E2M1_MAX = scalar_types.float4_e2m1f.max()
@@ -17,14 +16,6 @@ kE2M1ToFloat = torch.tensor([0., 0.5, 1., 1.5, 2., 3., 4., 6.],
                             dtype=torch.float32)
 
 
-def cutlass_fp4_supported() -> bool:
-    if not current_platform.is_cuda():
-        return False
-    capability_tuple = current_platform.get_device_capability()
-    capability = -1 if capability_tuple is None else capability_tuple.to_int()
-    return cutlass_scaled_mm_supports_fp4(capability)
-
-
 def break_fp4_bytes(a, dtype):
     assert a.dtype == torch.uint8
     m, n = a.shape

vllm/model_executor/layers/quantization/utils/quant_utils.py

@@ -8,8 +8,10 @@ from typing import ClassVar, NamedTuple, Optional
 import numpy
 import torch
 
+from vllm._custom_ops import cutlass_scaled_mm_supports_fp4
 from vllm.model_executor.layers.quantization.qqq import (
     MARLIN_QQQ_SUPPORTED_NUM_BITS)
+from vllm.platforms import current_platform
 from vllm.scalar_type import ScalarType, scalar_types
 
 
@@ -592,3 +594,56 @@ def awq_pack(
     q_w = q_w.reshape((-1, size_n)).contiguous()
 
     return pack_cols(q_w, num_bits, size_k, size_n)
+
+
+def swizzle_blockscale(scale: torch.Tensor) -> torch.Tensor:
+    """
+    Pad and block-interleave the FP4 block-scales so that they match the data
+    layout expected by the CUTLASS / FlashInfer kernels.
+
+    Parameters
+    ----------
+    scale: torch.Tensor
+
+    Returns
+    -------
+    torch.Tensor
+        The swizzled tensor with the same logical shape as *scale*.
+    """
+    assert scale.dtype == torch.float8_e4m3fn, (
+        "swizzle_blockscale expects the input tensor to be in "
+        "torch.float8_e4m3fn format.")
+
+    scale_ndim = scale.ndim
+    if scale_ndim == 2:
+        scale = scale.unsqueeze(0)  # (1, M, K)
+    assert scale.ndim == 3, "Expected a 2-D or 3-D tensor for block scales."
+
+    B, M, K = scale.shape
+
+    def _round_up(x: int, m: int) -> int:
+        return (x + m - 1) // m * m
+
+    M_padded = _round_up(M, 128)
+    K_padded = _round_up(K, 4)
+
+    padded = torch.zeros((B, M_padded, K_padded),
+                         dtype=scale.dtype,
+                         device=scale.device)
+    padded[:B, :M, :K] = scale
+
+    # Reshape / permute to the layout required by the kernel.
+    padded = padded.reshape(B, M_padded // 128, 4, 32, K_padded // 4, 4)
+    swizzled = padded.permute(0, 1, 4, 3, 2, 5).contiguous().cuda()
+
+    if scale_ndim == 2:
+        return swizzled.reshape(M, K)
+    return swizzled.reshape(B, M, K)
+
+
+def cutlass_fp4_supported() -> bool:
+    if not current_platform.is_cuda():
+        return False
+    capability_tuple = current_platform.get_device_capability()
+    capability = -1 if capability_tuple is None else capability_tuple.to_int()
+    return cutlass_scaled_mm_supports_fp4(capability)