add tg-mxfp4-moe-test (#22540)

Signed-off-by: siyuanf <siyuanf@nvidia.com>
Signed-off-by: Siyuan Fu <siyuanf@nvidia.com>
Co-authored-by: Michael Goin <mgoin64@gmail.com>

.buildkite/test-pipeline.yaml

@@ -655,6 +655,7 @@ steps:
     - pytest -v -s tests/kernels/quantization/test_nvfp4_scaled_mm.py
     - pytest -v -s tests/kernels/quantization/test_flashinfer_nvfp4_scaled_mm.py
     - pytest -v -s tests/kernels/moe/test_nvfp4_moe.py
+    - pytest -v -s tests/kernels/moe/test_mxfp4_moe.py
     # Fusion
     - pytest -v -s tests/compile/test_fusion_all_reduce.py
     - pytest -v -s tests/compile/test_fusion_attn.py::test_attention_quant_pattern

tests/kernels/moe/test_mxfp4_moe.py

@@ -4,15 +4,27 @@
 import importlib
 import importlib.metadata
 from dataclasses import dataclass
+from typing import Optional
 
 import pytest
 import torch
 from packaging import version
 
+from vllm.platforms import current_platform
+
 QUARK_MXFP4_AVAILABLE = importlib.util.find_spec(
     "quark") is not None and version.parse(
         importlib.metadata.version("amd-quark")) >= version.parse('0.8.99')
 
+TRTLLM_GEN_MXFP4_AVAILABLE = current_platform.is_cuda(
+) and current_platform.is_device_capability(100)
+
+if TRTLLM_GEN_MXFP4_AVAILABLE:
+    from flashinfer import (fp4_quantize, mxfp8_quantize,
+                            next_positive_power_of_2,
+                            reorder_rows_for_gated_act_gemm, shuffle_matrix_a,
+                            shuffle_matrix_sf_a, trtllm_fp4_block_scale_moe)
+
 
 @dataclass
 class ModelCase:
@@ -54,4 +66,410 @@ def test_mxfp4_loading_and_execution_moe(vllm_runner, model_case: ModelCase):
 
         output = llm.generate_greedy("Today I am in the French Alps and",
                                      max_tokens=20)
-        assert output
\ No newline at end of file
+        assert output
+
+
+def swiglu(x,
+           alpha: float = 1.702,
+           beta: float = 1.0,
+           limit: Optional[float] = None):
+    # Note we add an extra bias of 1 to the linear layer
+    x_glu, x_linear = torch.chunk(x, 2, dim=-1)
+    if limit is not None:
+        x_glu = x_glu.clamp(max=limit)
+        x_linear = x_linear.clamp(min=-limit, max=limit)
+    out_glu = x_glu * torch.sigmoid(alpha * x_glu)
+    return out_glu * (x_linear + beta)
+
+
+fp4_lookup_table = [
+    0, 0.5, 1, 1.5, 2, 3, 4, 6, -0, -0.5, -1, -1.5, -2, -3, -4, -6
+]
+
+
+def mxfp4_dequantize(x, scale):
+    assert x.dtype == torch.uint8
+    x = x.view(torch.uint8).to(torch.int32)
+    x_unpacked = torch.zeros(*x.shape[:-1],
+                             x.shape[-1] * 2,
+                             dtype=torch.int32,
+                             device=x.device)
+    x_unpacked[..., 0::2].copy_(x & 0xF)
+    x_unpacked[..., 1::2].copy_((x >> 4) & 0xF)
+
+    x_float = torch.zeros(x_unpacked.shape,
+                          dtype=torch.float32,
+                          device=x.device)
+    for i, val in enumerate(fp4_lookup_table):
+        x_float[x_unpacked == i] = val
+
+    scale = scale.view(torch.uint8).to(torch.int32)
+    scale = (scale << 23).view(torch.float32)
+    scale = scale.reshape(*x.shape[:-1], -1)
+    scale = torch.stack([scale] * 32, dim=-1).reshape(*x_float.shape)
+
+    return x_float * scale
+
+
+def mxfp8_dequantize(x, scale):
+    assert x.dtype == torch.float8_e4m3fn
+    x_float = x.to(torch.float32)
+
+    scale = scale.view(torch.uint8).to(torch.int32)
+    scale = (scale << 23).view(torch.float32)
+    scale = scale.reshape(*x.shape[:-1], -1)
+    scale = torch.stack([scale] * 32, dim=-1).reshape(*x_float.shape)
+
+    return x_float * scale
+
+
+def reference_moe(
+    roouting_logits,
+    topk,
+    num_experts,
+    hidden_states,
+    w13,
+    bias13,
+    w2,
+    bias2,
+    alpha,
+    beta,
+    limit,
+    act_type,
+):
+    # renormalize routing
+    experts = torch.topk(roouting_logits, k=topk, dim=-1, sorted=True)
+    expert_weights = torch.nn.functional.softmax(experts.values, dim=1)
+    expert_indices = experts.indices
+    t = hidden_states.clone()
+    # MLP #1
+    mlp1_weight = w13[expert_indices, ...]
+    mlp1_bias = bias13[expert_indices, ...]
+    t = torch.einsum("beck,bk->bec", mlp1_weight, t) + mlp1_bias
+    t = swiglu(t, alpha=alpha, beta=beta, limit=limit)
+
+    if act_type == 'mxfp8':
+        t_quantized, t_scale = mxfp8_quantize(t.to(torch.bfloat16),
+                                              is_sf_swizzled_layout=False)
+        t = mxfp8_dequantize(t_quantized, t_scale)
+    # MLP #2
+    mlp2_weight = w2[expert_indices, ...]
+    mlp2_bias = bias2[expert_indices, ...]
+    t = torch.einsum("beck,bek->bec", mlp2_weight, t) + mlp2_bias
+    # Weighted sum of experts
+    t = torch.einsum("bec,be->bc", t, expert_weights)
+    assert t.shape == hidden_states.shape
+    return t.to(torch.bfloat16)
+
+
+def get_tile_tokens_dim(x: torch.Tensor, top_k: int, num_experts: int):
+    # Number of tokens in the input tensor.
+    num_tokens = x.shape[0]
+    # Factor to account for the imbalance of the experts.
+    # factor equals to the
+    # max_real_num_tokens_per_expert / perfect_num_tokens_per_expert
+    # - 1.0 means perfect expert distribution.
+    # - > 1.0 means some experts have more
+    #     tokens than the perfect distribution.
+    # - < 1.0 does not make sense.
+    imbalance_factor = 1.3
+    # Calculate the number of tokens per expert
+    # assuming perfect distribution.
+    num_tokens_per_expert = (num_tokens * top_k) // num_experts
+    # Apply the imbalance factor.
+    num_tokens_per_expert = int(num_tokens_per_expert * imbalance_factor)
+    # And pad the number to the next power of 2.
+    tile_tokens_dim = next_positive_power_of_2(num_tokens_per_expert)
+    # Cap to 8-64 tokens per CTA tile
+    # as it's the range supported by the kernel.
+    tile_tokens_dim = min(max(tile_tokens_dim, 8), 64)
+    return tile_tokens_dim
+
+
+def tg_mxfp4_moe(
+    router_logits,
+    topk,
+    num_experts,
+    intermediate_size,
+    hidden_size,
+    hidden_states,
+    hidden_states_scale,
+    w13_weight,
+    w13_weight_scale,
+    w13_bias,
+    w2_weight,
+    w2_weight_scale,
+    w2_bias,
+    act_type,
+    alpha,
+    beta,
+    limit,
+) -> torch.Tensor:
+    sf_block_size = 32
+    assert (w13_weight.dim() == 3 and w13_weight.shape[0] == num_experts
+            and w13_weight.shape[1] == intermediate_size * 2
+            and w13_weight.shape[2] == hidden_size // 2)
+    assert (w13_weight_scale.dim() == 3
+            and w13_weight_scale.shape[0] == num_experts
+            and w13_weight_scale.shape[1] == intermediate_size * 2
+            and w13_weight_scale.shape[2] == hidden_size // sf_block_size)
+    assert (w2_weight.dim() == 3 and w2_weight.shape[0] == num_experts
+            and w2_weight.shape[1] == hidden_size
+            and w2_weight.shape[2] == intermediate_size // 2)
+    assert (w2_weight_scale.dim() == 3
+            and w2_weight_scale.shape[1] == hidden_size
+            and w2_weight_scale.shape[2] == intermediate_size // sf_block_size)
+    assert (w13_bias.dim() == 2 and w13_bias.shape[0] == num_experts
+            and w13_bias.shape[1] == intermediate_size * 2)
+    assert (w2_bias.dim() == 2 and w2_bias.shape[0] == num_experts
+            and w2_bias.shape[1] == hidden_size)
+
+    # Swap w1 and w3 as the defenition of
+    # swiglu is different in the trtllm-gen
+    w13_weight_scale_ = w13_weight_scale.clone()
+    w13_weight_ = w13_weight.clone()
+    w13_bias_ = w13_bias.clone()
+    w13_weight[:, :intermediate_size, :].copy_(
+        w13_weight_[:, intermediate_size:, :])
+    w13_weight[:, intermediate_size:, :].copy_(
+        w13_weight_[:, :intermediate_size, :])
+    w13_weight_scale[:, :intermediate_size, :].copy_(
+        w13_weight_scale_[:, intermediate_size:, :])
+    w13_weight_scale[:, intermediate_size:, :].copy_(
+        w13_weight_scale_[:, :intermediate_size, :])
+    w13_bias[:, :intermediate_size].copy_(w13_bias_[:, intermediate_size:])
+    w13_bias[:, intermediate_size:].copy_(w13_bias_[:, :intermediate_size])
+
+    # Interleave the weights and scaling factors for activation
+    w13_weight_interleaved = []
+    w13_weight_scale_interleaved = []
+    w13_bias_interleaved = []
+    for i in range(num_experts):
+        w13_weight_interleaved.append(
+            reorder_rows_for_gated_act_gemm(w13_weight[i].clone()))
+        w13_weight_scale_interleaved.append(
+            reorder_rows_for_gated_act_gemm(w13_weight_scale[i].clone()))
+        w13_bias_interleaved.append(
+            reorder_rows_for_gated_act_gemm(w13_bias[i].clone().reshape(-1,
+                                                                        1)))
+    w13_weight = torch.stack(w13_weight_interleaved).reshape(
+        num_experts, 2 * intermediate_size, hidden_size // 2)
+    w13_weight_scale = torch.stack(w13_weight_scale_interleaved).reshape(
+        num_experts, 2 * intermediate_size, hidden_size // 32)
+    w13_bias = torch.stack(w13_bias_interleaved).reshape(
+        num_experts, 2 * intermediate_size)
+
+    # Shuffle weights and scaling factors for transposed mma output
+    gemm1_weights_shuffled = []
+    gemm1_scales_shuffled = []
+    gemm2_weights_shuffled = []
+    gemm2_scales_shuffled = []
+    gemm1_bias_shuffled = []
+    gemm2_bias_shuffled = []
+    epilogue_tile_m = 128  # FIXME: this depends on the kernel internals
+    for i in range(num_experts):
+        gemm1_weights_shuffled.append(
+            shuffle_matrix_a(w13_weight[i].view(torch.uint8), epilogue_tile_m))
+        gemm1_scales_shuffled.append(
+            shuffle_matrix_sf_a(w13_weight_scale[i].view(torch.uint8),
+                                epilogue_tile_m))
+
+        gemm2_weights_shuffled.append(
+            shuffle_matrix_a(w2_weight[i].view(torch.uint8), epilogue_tile_m))
+        gemm2_scales_shuffled.append(
+            shuffle_matrix_sf_a(w2_weight_scale[i].view(torch.uint8),
+                                epilogue_tile_m))
+        gemm1_bias_shuffled.append(
+            shuffle_matrix_a(w13_bias[i].reshape(-1, 1), epilogue_tile_m))
+        gemm2_bias_shuffled.append(
+            shuffle_matrix_a(w2_bias[i].reshape(-1, 1), epilogue_tile_m))
+
+    w13_weight = torch.stack(gemm1_weights_shuffled)
+    w13_weight_scale = torch.stack(gemm1_scales_shuffled).reshape(
+        num_experts, 2 * intermediate_size,
+        hidden_size // sf_block_size).view(torch.float8_e4m3fn)
+    w13_bias = torch.stack(gemm1_bias_shuffled).reshape(num_experts, -1)
+
+    w2_weight = torch.stack(gemm2_weights_shuffled)
+    w2_weight_scale = torch.stack(gemm2_scales_shuffled).reshape(
+        num_experts, hidden_size,
+        intermediate_size // sf_block_size).view(torch.float8_e4m3fn)
+    w2_bias = torch.stack(gemm2_bias_shuffled).reshape(num_experts, -1)
+
+    tg_result = trtllm_fp4_block_scale_moe(
+        routing_logits=router_logits.to(torch.bfloat16),
+        routing_bias=None,
+        hidden_states=hidden_states,
+        hidden_states_scale=hidden_states_scale,
+        gemm1_weights=w13_weight,
+        gemm1_weights_scale=w13_weight_scale,
+        gemm1_bias=w13_bias,
+        gemm1_alpha=alpha,
+        gemm1_beta=beta,
+        gemm1_clamp_limit=limit,
+        gemm2_weights=w2_weight,
+        gemm2_weights_scale=w2_weight_scale,
+        gemm2_bias=w2_bias,
+        output1_scale_scalar=None,
+        output1_scale_gate_scalar=None,
+        output2_scale_scalar=None,
+        num_experts=num_experts,
+        top_k=topk,
+        n_group=None,
+        topk_group=None,
+        intermediate_size=intermediate_size,
+        local_expert_offset=0,
+        local_num_experts=num_experts,
+        routed_scaling_factor=None,
+        tile_tokens_dim=get_tile_tokens_dim(hidden_states, topk, num_experts),
+        routing_method_type=1,  # renormalize
+        do_finalize=True)[0]
+    return tg_result
+
+
+def check_accuracy(a, b, atol, rtol, percent):
+    """Allow a mismatch percentage of 1 - percent."""
+    if torch.any(torch.isnan(a)):
+        raise Exception("NaN in reference output")
+    if torch.any(torch.isnan(b)):
+        raise Exception("NaN in actual output")
+    if torch.any(torch.isinf(a)):
+        raise Exception("Inf in reference output")
+    if torch.any(torch.isinf(b)):
+        raise Exception("Inf in actual output")
+    assert a.shape == b.shape, f"Shape mismatch: {a.shape} vs {b.shape}"
+
+    left = torch.abs(a - b)
+    right = atol + rtol * torch.abs(b)
+    count = torch.sum(left > right)
+    mismatch_percent = count / a.numel()
+    if mismatch_percent > 1 - percent:
+        raise Exception(
+            f"Mismatch percentage is {mismatch_percent:.4f} for rtol {rtol} "
+            f"(threshold: {1-percent:.4f})")
+
+
+@pytest.mark.parametrize("topk", [1, 4])
+@pytest.mark.parametrize("num_experts", [32, 128])
+@pytest.mark.parametrize("num_tokens", [1, 128, 1024])
+@pytest.mark.parametrize("intermediate_size,hidden_size", [(3072, 3072)])
+@pytest.mark.parametrize("alpha,beta,limit", [(1.0, 1.0, None),
+                                              (1.702, 1.0, 7.0)])
+@pytest.mark.parametrize("act_type", ['mxfp8', 'bf16'])
+@pytest.mark.skipif(
+    not TRTLLM_GEN_MXFP4_AVAILABLE,
+    reason="nvidia gpu and compute capability sm100 is required for this test")
+def test_trtllm_gen_mxfp4_fused_moe(
+    topk: int,
+    num_experts: int,
+    num_tokens: int,
+    intermediate_size: int,
+    hidden_size: int,
+    alpha: float,
+    beta: float,
+    limit: Optional[float],
+    act_type: str,
+):
+    seed = 42
+    torch.manual_seed(seed)
+    hidden_states = torch.randn(num_tokens,
+                                hidden_size,
+                                device="cuda:0",
+                                dtype=torch.bfloat16)
+    w13 = (torch.randn(num_experts,
+                       intermediate_size * 2,
+                       hidden_size,
+                       device="cuda:0",
+                       dtype=torch.bfloat16))
+    w2 = (torch.randn(num_experts,
+                      hidden_size,
+                      intermediate_size,
+                      device="cuda:0",
+                      dtype=torch.bfloat16))
+    bias13 = torch.randn(num_experts, intermediate_size * 2,
+                         device="cuda:0") * 10
+    bias2 = torch.randn(num_experts, hidden_size, device="cuda:0") * 10
+    router_logits = torch.rand(num_tokens, num_experts,
+                               dtype=torch.float32).cuda()
+
+    w13, w13_scale = fp4_quantize(w13,
+                                  torch.tensor(1.0, device="cuda:0"),
+                                  32,
+                                  sf_use_ue8m0=True,
+                                  is_sf_swizzled_layout=False)
+    w13_scale = w13_scale.view(torch.float8_e4m3fn).reshape(
+        num_experts, intermediate_size * 2, hidden_size // 32)
+    w2, w2_scale = fp4_quantize(w2,
+                                torch.tensor(1.0, device="cuda:0"),
+                                32,
+                                sf_use_ue8m0=True,
+                                is_sf_swizzled_layout=False)
+    w2_scale = w2_scale.view(torch.float8_e4m3fn).reshape(
+        num_experts, hidden_size, intermediate_size // 32)
+    if act_type == 'mxfp8':
+        hidden_states, hidden_states_scale = mxfp8_quantize(
+            hidden_states, is_sf_swizzled_layout=False)
+        hidden_states_scale = hidden_states_scale.view(
+            torch.float8_e4m3fn).reshape(-1)
+    else:
+        hidden_states_scale = None
+
+    # reference result
+    ref_result = torch.empty_like(hidden_states, dtype=torch.bfloat16)
+    w13_ref = mxfp4_dequantize(w13.clone(), w13_scale.clone())
+    w2_ref = mxfp4_dequantize(w2.clone(), w2_scale.clone())
+    bias13_ref = bias13
+    bias2_ref = bias2
+    if act_type == 'mxfp8':
+        hidden_states_ref = mxfp8_dequantize(
+            hidden_states, hidden_states_scale).to(torch.float32)
+    else:
+        hidden_states_ref = hidden_states.to(torch.float32)
+    # Process tokens in chunks of 32 to reduce memory usage
+    chunk_size = 32
+    num_chunks = (num_tokens + chunk_size - 1) // chunk_size
+    for i in range(num_chunks):
+        start_idx = i * chunk_size
+        end_idx = min(start_idx + chunk_size, num_tokens)
+        chunk_result = reference_moe(
+            router_logits[start_idx:end_idx].to(torch.float32),
+            topk,
+            num_experts,
+            hidden_states_ref[start_idx:end_idx],
+            w13_ref,
+            bias13_ref,
+            w2_ref,
+            bias2_ref,
+            alpha,
+            beta,
+            limit,
+            act_type,
+        )
+        ref_result[start_idx:end_idx].copy_(chunk_result)
+
+    # trtllm-gen result
+    if alpha is not None:
+        alpha = torch.full((num_experts, ), alpha, device=hidden_states.device)
+    if limit is not None:
+        limit = torch.full((num_experts, ), limit, device=hidden_states.device)
+    if beta is not None:
+        beta = torch.full((num_experts, ), beta, device=hidden_states.device)
+    tg_result = tg_mxfp4_moe(router_logits,
+                             topk,
+                             num_experts,
+                             intermediate_size,
+                             hidden_size,
+                             hidden_states,
+                             hidden_states_scale,
+                             w13,
+                             w13_scale,
+                             bias13,
+                             w2,
+                             w2_scale,
+                             bias2,
+                             act_type,
+                             alpha=alpha,
+                             beta=beta,
+                             limit=limit)
+    # relatively loose check since the mxfp4 quantization is less accurate
+    check_accuracy(ref_result, tg_result, atol=0, rtol=0.3, percent=0.8)