[Kernel] Enable 8-bit weights in Fused Marlin MoE

csrc/moe/marlin_moe_ops.h

@@ -2,11 +2,14 @@
 
 #include <torch/all.h>
 
+#include "core/scalar_type.hpp"
+
 torch::Tensor marlin_gemm_moe(
     const torch::Tensor& a, const torch::Tensor& b_q_weights,
     const torch::Tensor& sorted_ids, const torch::Tensor& topk_weights,
     const torch::Tensor& topk_ids, const torch::Tensor& b_scales,
     const torch::Tensor& g_idx, const torch::Tensor& perm,
-    torch::Tensor& workspace, int64_t size_m, int64_t size_n, int64_t size_k,
-    bool is_k_full, int64_t num_experts, int64_t topk, int64_t moe_block_size,
-    bool replicate_input, bool apply_weights);
+    torch::Tensor& workspace, vllm::ScalarTypeTorchPtr const& b_q_type,
+    int64_t size_m, int64_t size_n, int64_t size_k, bool is_k_full,
+    int64_t num_experts, int64_t topk, int64_t moe_block_size,
+    bool replicate_input, bool apply_weights);

csrc/moe/torch_bindings.cpp

@@ -13,10 +13,11 @@ TORCH_LIBRARY_EXPAND(TORCH_EXTENSION_NAME, m) {
   m.def(
       "marlin_gemm_moe(Tensor! a, Tensor! b_q_weights, Tensor! sorted_ids, "
       "Tensor! topk_weights, Tensor! topk_ids, Tensor! b_scales, Tensor! "
-      "g_idx, Tensor! perm, Tensor! workspace, int size_m, int size_n, int "
-      "size_k, bool is_k_full, int num_experts, int topk, int moe_block_size, "
-      "bool replicate_input, bool apply_weights) -> Tensor");
-
+      "g_idx, Tensor! perm, Tensor! workspace, "
+      "__torch__.torch.classes._core_C.ScalarType b_q_type, int size_m, "
+      "int size_n, int size_k, bool is_k_full, int num_experts, int topk, "
+      "int moe_block_size, bool replicate_input, bool apply_weights)"
+      " -> Tensor");
   m.impl("marlin_gemm_moe", torch::kCUDA, &marlin_gemm_moe);
 #endif
 }

tests/kernels/test_moe.py

@@ -2,14 +2,22 @@
 
 Run `pytest tests/kernels/test_moe.py`.
 """
+from typing import List
+
 import pytest
 import torch
 from transformers import MixtralConfig
 from transformers.models.mixtral.modeling_mixtral import MixtralSparseMoeBlock
 
 from vllm.model_executor.layers.activation import SiluAndMul
 from vllm.model_executor.layers.fused_moe import fused_moe
+from vllm.model_executor.layers.fused_moe.fused_marlin_moe import (
+    fused_marlin_moe, single_marlin_moe)
+from vllm.model_executor.layers.fused_moe.fused_moe import fused_topk
+from vllm.model_executor.layers.quantization.utils.marlin_utils_test import (
+    marlin_quantize)
 from vllm.model_executor.models.mixtral import MixtralMoE
+from vllm.scalar_type import scalar_types
 
 
 def torch_moe(a, w1, w2, score, topk):
@@ -29,6 +37,20 @@ def torch_moe(a, w1, w2, score, topk):
             topk_weight.view(B, -1, 1).to(out.dtype)).sum(dim=1)
 
 
+def torch_moe_single(a, w, score, topk):
+    B, D = a.shape
+    a = a.view(B, -1, D).repeat(1, topk, 1).reshape(-1, D)
+    out = torch.zeros(B * topk, w.shape[1], dtype=a.dtype, device=a.device)
+    score = torch.softmax(score, dim=-1, dtype=torch.float32)
+    _, topk_ids = torch.topk(score, topk)
+    topk_ids = topk_ids.view(-1)
+    for i in range(w.shape[0]):
+        mask = topk_ids == i
+        if mask.sum():
+            out[mask] = a[mask] @ w[i].transpose(0, 1)
+    return (out.view(B, -1, w.shape[1])).sum(dim=1)
+
+
 @pytest.mark.parametrize("m", [1024 * 128, 512, 222, 33, 1])
 @pytest.mark.parametrize("n", [2048, 256, 1024])
 @pytest.mark.parametrize("k", [128, 511, 1024])
@@ -43,11 +65,11 @@ def test_fused_moe(
     topk: int,
     dtype: torch.dtype,
 ):
-    a = torch.randn((m, k), device='cuda', dtype=dtype) / 10
-    w1 = torch.randn((e, 2 * n, k), device='cuda', dtype=dtype) / 10
-    w2 = torch.randn((e, k, n), device='cuda', dtype=dtype) / 10
+    a = torch.randn((m, k), device="cuda", dtype=dtype) / 10
+    w1 = torch.randn((e, 2 * n, k), device="cuda", dtype=dtype) / 10
+    w2 = torch.randn((e, k, n), device="cuda", dtype=dtype) / 10
 
-    score = torch.randn((m, e), device='cuda', dtype=dtype)
+    score = torch.randn((m, e), device="cuda", dtype=dtype)
     triton_output = fused_moe(a, w1, w2, score, topk, renormalize=False)
     torch_output = torch_moe(a, w1, w2, score, topk)
     torch.testing.assert_close(triton_output, torch_output, atol=1e-2, rtol=0)
@@ -99,3 +121,203 @@ def test_mixtral_moe(dtype: torch.dtype):
                                vllm_states,
                                rtol=mixtral_moe_tol[dtype],
                                atol=mixtral_moe_tol[dtype])
+
+
+def stack_and_dev(tensors: List[torch.Tensor]):
+    dev = tensors[0].device
+    return torch.stack(tensors, dim=0).to(dev)
+
+
+def compute_max_diff(output, output_ref):
+    return torch.mean(torch.abs(output - output_ref)) / torch.mean(
+        torch.abs(output_ref))
+
+
+@pytest.mark.parametrize("m", [64, 512, 222, 33, 1])
+@pytest.mark.parametrize("n", [128, 2048, 256, 1024])
+@pytest.mark.parametrize("k", [128, 1024, 512])
+@pytest.mark.parametrize("e", [4, 8, 64])
+@pytest.mark.parametrize("topk", [2, 6])
+@pytest.mark.parametrize("group_size", [-1, 32, 64, 128])
+@pytest.mark.parametrize("act_order", [True, False])
+@pytest.mark.parametrize("num_bits", [4, 8])
+def test_fused_marlin_moe(
+    m: int,
+    n: int,
+    k: int,
+    e: int,
+    topk: int,
+    group_size: int,
+    act_order: bool,
+    num_bits: int,
+):
+    torch.manual_seed(7)
+
+    if topk > e:
+        return
+
+    # Filter act_order
+    if act_order:
+        if group_size == -1:
+            return
+        if group_size in (k, n):
+            return
+
+    quant_type = (scalar_types.uint4b8
+                  if num_bits == 4 else scalar_types.uint8b128)
+    dtype = torch.float16
+    a = torch.randn((m, k), device="cuda", dtype=dtype) / 10
+    w1 = torch.randn((e, 2 * n, k), device="cuda", dtype=dtype) / 10
+    w2 = torch.randn((e, k, n), device="cuda", dtype=dtype) / 10
+    for i in range(w2.shape[0]):
+        w2[0] = torch.eye(k, n, device="cuda", dtype=dtype)
+
+    w_ref1_l = []
+    qweight1_l = []
+    scales1_l = []
+    g_idx1_l = []
+    sort_indices1_l = []
+
+    for i in range(w1.shape[0]):
+        test_perm = torch.randperm(k)
+        w_ref1, qweight1, scales1, g_idx1, sort_indices1, _ = marlin_quantize(
+            w1[i].transpose(1, 0), quant_type, group_size, act_order,
+            test_perm)
+        w_ref1_l.append(w_ref1)
+        qweight1_l.append(qweight1)
+        scales1_l.append(scales1)
+        g_idx1_l.append(g_idx1)
+        sort_indices1_l.append(sort_indices1)
+
+    w_ref1 = stack_and_dev(w_ref1_l)
+    qweight1 = stack_and_dev(qweight1_l).contiguous()
+    scales1 = stack_and_dev(scales1_l)
+    g_idx1 = stack_and_dev(g_idx1_l)
+    sort_indices1 = stack_and_dev(sort_indices1_l)
+
+    w_ref2_l = []
+    qweight2_l = []
+    scales2_l = []
+    g_idx2_l = []
+    sort_indices2_l = []
+
+    for i in range(w2.shape[0]):
+        test_perm = torch.randperm(n)
+        w_ref2, qweight2, scales2, g_idx2, sort_indices2, _ = marlin_quantize(
+            w2[i].transpose(1, 0), quant_type, group_size, act_order,
+            test_perm)
+        w_ref2_l.append(w_ref2)
+        qweight2_l.append(qweight2)
+        scales2_l.append(scales2)
+        g_idx2_l.append(g_idx2)
+        sort_indices2_l.append(sort_indices2)
+
+    w_ref2 = stack_and_dev(w_ref2_l)
+    qweight2 = stack_and_dev(qweight2_l).contiguous()
+    scales2 = stack_and_dev(scales2_l)
+    g_idx2 = stack_and_dev(g_idx2_l)
+    sort_indices2 = stack_and_dev(sort_indices2_l)
+
+    score = torch.randn((m, e), device="cuda", dtype=dtype)
+
+    topk_weights, topk_ids = fused_topk(a, score, topk, False)
+
+    triton_output = fused_moe(
+        a,
+        w_ref1.transpose(1, 2).contiguous(),
+        w_ref2.transpose(1, 2).contiguous(),
+        score,
+        topk,
+        renormalize=False,
+    )
+    marlin_output = fused_marlin_moe(
+        a,
+        qweight1,
+        qweight2,
+        score,
+        g_idx1,
+        g_idx2,
+        sort_indices1,
+        sort_indices2,
+        topk_weights,
+        topk_ids,
+        renormalize=False,
+        w1_scale=scales1,
+        w2_scale=scales2,
+        num_bits=num_bits,
+    )
+
+    assert compute_max_diff(marlin_output, triton_output) < 4e-2
+
+
+@pytest.mark.skip("This test is here for the sake of debugging, "
+                  "don't run it in automated tests.")
+@pytest.mark.parametrize("m", [64, 512, 222, 33, 1])
+@pytest.mark.parametrize("n", [128, 2048, 256, 1024])
+@pytest.mark.parametrize("k", [128, 1024, 512])
+@pytest.mark.parametrize("e", [4, 8, 64])
+@pytest.mark.parametrize("topk", [2, 6])
+@pytest.mark.parametrize("group_size", [-1, 32, 64, 128])
+@pytest.mark.parametrize("act_order", [True, False])
+@pytest.mark.parametrize("num_bits", [4, 8])
+def test_marlin_moe_mmm(
+    m: int,
+    n: int,
+    k: int,
+    e: int,
+    topk: int,
+    group_size: int,
+    act_order: bool,
+    num_bits: int,
+):
+    if topk > e:
+        return
+
+    # Filter act_order
+    if act_order:
+        if group_size == -1:
+            return
+        if group_size == k:
+            return
+
+    quant_type = (scalar_types.uint4b8
+                  if num_bits == 4 else scalar_types.uint8b128)
+    dtype = torch.float16
+    a = torch.randn((m, k), device="cuda", dtype=dtype) / 10
+    w = torch.randn((e, n, k), device="cuda", dtype=dtype) / 10
+
+    w_ref_l = []
+    qweights_l = []
+    scales_l = []
+    g_idx_l = []
+    sort_indices_l = []
+
+    for i in range(w.shape[0]):
+        test_perm = torch.randperm(k)
+        w_ref, qweight, scales, g_idx, sort_indices, _ = marlin_quantize(
+            w[i].transpose(1, 0), quant_type, group_size, act_order, test_perm)
+        w_ref_l.append(w_ref)
+        qweights_l.append(qweight)
+        scales_l.append(scales)
+        g_idx_l.append(g_idx)
+        sort_indices_l.append(sort_indices)
+
+    w_ref = stack_and_dev(w_ref_l)
+    qweight = stack_and_dev(qweights_l).contiguous()
+    scales = stack_and_dev(scales_l)
+    g_idx = stack_and_dev(g_idx_l)
+    sort_indices = stack_and_dev(sort_indices_l)
+
+    score = torch.randn((m, e), device="cuda", dtype=dtype)
+    marlin_output = single_marlin_moe(a,
+                                      qweight,
+                                      scales,
+                                      score,
+                                      g_idx,
+                                      sort_indices,
+                                      topk,
+                                      renormalize=False,
+                                      num_bits=num_bits)
+    torch_output = torch_moe_single(a, w_ref.transpose(1, 2), score, topk)
+
+    assert compute_max_diff(marlin_output, torch_output) < 1e-2

vllm/_custom_ops.py

@@ -314,7 +314,7 @@ def gptq_marlin_moe_repack(b_q_weight: torch.Tensor, perm: torch.Tensor,
                            num_bits: int) -> torch.Tensor:
     num_experts = b_q_weight.shape[0]
     assert size_k % 16 == 0
-    output = torch.empty((num_experts, size_k // 16, size_n * 2),
+    output = torch.empty((num_experts, size_k // 16, size_n * (num_bits // 2)),
                          device=b_q_weight.device,
                          dtype=b_q_weight.dtype)
     for e in range(num_experts):

vllm/model_executor/layers/fused_moe/__init__.py

@@ -2,16 +2,22 @@
     FusedMoE, FusedMoEMethodBase, FusedMoeWeightScaleSupported)
 from vllm.triton_utils import HAS_TRITON
 
-__all__ = ["FusedMoE", "FusedMoEMethodBase", "FusedMoeWeightScaleSupported"]
+__all__ = [
+    "FusedMoE",
+    "FusedMoEMethodBase",
+    "FusedMoeWeightScaleSupported",
+]
 
 if HAS_TRITON:
-
+    from vllm.model_executor.layers.fused_moe.fused_marlin_moe import (
+        fused_marlin_moe, single_marlin_moe)
     from vllm.model_executor.layers.fused_moe.fused_moe import (
-        fused_experts, fused_marlin_moe, fused_moe, fused_topk,
-        get_config_file_name, grouped_topk)
+        fused_experts, fused_moe, fused_topk, get_config_file_name,
+        grouped_topk)
 
     __all__ += [
         "fused_marlin_moe",
+        "single_marlin_moe",
         "fused_moe",
         "fused_topk",
         "fused_experts",