486 lines
17 KiB
Python
486 lines
17 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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import unittest
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from typing import Callable
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import torch
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from flashinfer import fp4_quantize, scaled_fp4_grouped_quantize
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from torch.nn import functional as F
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from sglang.jit_kernel.nvfp4 import scaled_fp4_quant
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from sglang.srt.layers.activation import SiluAndMul
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from sglang.srt.layers.moe.flashinfer_cutedsl_moe import flashinfer_cutedsl_moe_masked
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from sglang.srt.layers.moe.topk import TopKConfig, select_experts
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from sglang.test.ci.ci_register import register_cuda_ci
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register_cuda_ci(est_time=300, suite="stage-c-test-4-gpu-b200")
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SKIP_TEST = torch.cuda.get_device_capability() < (10, 0)
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SKIP_REASON = "Nvfp4 Requires compute capability of 10 or above."
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kE2M1ToFloat = torch.tensor(
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[0.0, 0.5, 1.0, 1.5, 2.0, 3.0, 4.0, 6.0], dtype=torch.float32
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)
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FLOAT8_E4M3_MAX = 448.0
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FLOAT4_E2M1_MAX = 6.0
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def convert_swizzled_to_linear(a_sf_swizzled: torch.Tensor, m, k, block_size):
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m_tiles = (m + 128 - 1) // 128
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f = block_size * 4
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k_tiles = (k + f - 1) // f
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tmp = torch.reshape(a_sf_swizzled, (1, m_tiles, k_tiles, 32, 4, 4))
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tmp = torch.permute(tmp, (0, 1, 4, 3, 2, 5))
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out = tmp.reshape(m_tiles * 128, k_tiles * f // block_size)
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return out[0:m, 0:k]
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def dequantize_nvfp4_to_dtype(
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tensor_fp4, tensor_sf, global_scale, dtype, device, block_size=16
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):
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"""Dequantize the fp4 tensor back to high precision."""
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# Two fp4 values are packed into one uint8.
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assert tensor_fp4.dtype == torch.uint8
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m, packed_k = tensor_fp4.shape
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k = packed_k * 2
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tensor_f32 = break_fp4_bytes(tensor_fp4, dtype)
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tensor_f32 = tensor_f32.reshape(m, k // block_size, block_size)
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tensor_sf = tensor_sf.view(torch.float8_e4m3fn)
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tensor_sf = convert_swizzled_to_linear(tensor_sf, m, k, block_size)
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tensor_sf_dtype = tensor_sf.to(torch.float32) / global_scale
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# scale the tensor
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out = (tensor_f32 * tensor_sf_dtype.unsqueeze(-1)).reshape(m, k)
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return out.to(dtype=dtype)
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def break_fp4_bytes(a, dtype):
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assert a.dtype == torch.uint8
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m, n = a.shape
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# Vectorized nibble processing
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a_flat = a.flatten()
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high = (a_flat & 0xF0) >> 4 # Upper nibbles
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low = a_flat & 0x0F # Lower nibbles
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# Combine nibbles for batch processing
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combined = torch.stack((low, high), dim=1).flatten()
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# Vectorized sign and magnitude extraction
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signs = (combined & 0x08).to(torch.bool) # Sign bits
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abs_vals = (combined & 0x07).to(torch.long) # Magnitude indices
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# Device-aware lookup and sign application
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kE2M1 = kE2M1ToFloat.to(device=a.device)
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values = kE2M1[abs_vals] * torch.where(signs, -1.0, 1.0)
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# Reshape to final form
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return values.reshape(m, n * 2).to(dtype=dtype)
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def compute_routing(router_logits: torch.Tensor, top_k: int):
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routing_weights = torch.softmax(router_logits, dim=1, dtype=torch.float)
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routing_weights, selected_experts = torch.topk(routing_weights, top_k, dim=-1)
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routing_weights /= routing_weights.sum(dim=-1, keepdim=True)
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routing_weights = routing_weights.float()
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return routing_weights, selected_experts
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def prepare_inputs(
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hidden_states: torch.Tensor,
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router_logits: torch.Tensor,
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num_experts: int,
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topk: int,
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):
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routing_weights, topk_idx = compute_routing(router_logits, topk)
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masked_m = []
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for i in range(num_experts):
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mask = topk_idx.view(-1) == i
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masked_m.append(mask.sum())
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masked_m = torch.tensor(masked_m, dtype=torch.int32)
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hidden_states_3d = torch.empty(
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(num_experts, max(masked_m), hidden_states.shape[1]), dtype=hidden_states.dtype
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)
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for i in range(num_experts):
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hidden_states_3d[i, : masked_m[i], :] = hidden_states[topk_idx.view(-1) == i]
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return hidden_states_3d, masked_m, topk_idx, routing_weights
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MNK_FACTORS = [
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(2, 1024, 1024),
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(2, 1024, 1536),
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(2, 3072, 1024),
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(2, 3072, 1536),
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(64, 1024, 1024),
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(64, 1024, 1536),
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(64, 3072, 1024),
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(64, 2048, 1024),
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(224, 1024, 1024),
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(224, 1024, 1536),
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]
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# Reference implementation of torch_moe
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def torch_moe(a, w1, w2, score, topk, expert_map):
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B, D = a.shape
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a = a.view(B, -1, D).repeat(1, topk, 1).reshape(-1, D)
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out = torch.zeros(B * topk, w2.shape[1], dtype=a.dtype, device=a.device)
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score = torch.softmax(score, dim=-1, dtype=torch.float32)
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topk_weight, topk_ids = torch.topk(score, topk)
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topk_weight = topk_weight.view(-1)
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topk_ids = topk_ids.view(-1)
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if expert_map is not None:
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topk_ids = expert_map[topk_ids]
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for i in range(w1.shape[0]):
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mask = topk_ids == i
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if mask.sum():
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out[mask] = SiluAndMul()(a[mask] @ w1[i].transpose(0, 1)) @ w2[i].transpose(
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0, 1
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)
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return (
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out.view(B, -1, w2.shape[1]) * topk_weight.view(B, -1, 1).to(out.dtype)
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).sum(dim=1)
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def torch_moe_nvfp4(a, w1, w2, topk, topk_weight, topk_ids):
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B, D = a.shape
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a = a.view(B, -1, D).repeat(1, topk, 1).reshape(-1, D)
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out = torch.zeros(B * topk, w2.shape[1], dtype=a.dtype, device=a.device)
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topk_weight = topk_weight.view(-1)
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topk_ids = topk_ids.view(-1)
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for i in range(w1.shape[0]):
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mask = topk_ids == i
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if mask.sum():
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m = w1[i].shape[0]
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assert m % 2 == 0
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# Note: w1 and w3 are swapped!
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w3_expert, w1_expert = w1[i][m // 2 :, :], w1[i][: m // 2, :]
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inter = F.silu(a[mask] @ w1_expert.t()) * (a[mask] @ w3_expert.t())
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inter_gs = torch.tensor(1.0).cuda()
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inter_q, inter_blockscale = fp4_quantize(inter, inter_gs)
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inter = dequantize_nvfp4_to_dtype(
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inter_q,
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inter_blockscale,
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inter_gs,
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dtype=inter.dtype,
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device=inter.device,
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block_size=16,
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).cuda()
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out[mask] = inter @ w2[i].transpose(0, 1)
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return (
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out.view(B, -1, w2.shape[1]) * topk_weight.view(B, -1, 1).to(out.dtype)
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).sum(dim=1)
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def check_moe(
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m: int,
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n: int,
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k: int,
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e: int,
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topk: int,
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dtype: torch.dtype,
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moe_impl: Callable,
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flip_w13: bool,
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):
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torch.manual_seed(7)
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a = torch.randn((m, k), device="cuda", dtype=dtype) / 10
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w1 = torch.randn((e, 2 * n, k), device="cuda", dtype=dtype) / 10
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quant_blocksize = 16
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round_up = lambda x, y: (x + y - 1) // y * y
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sf_w1_2n = round_up(2 * n, 128)
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sf_w1_k = round_up(k // quant_blocksize, 4)
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w1_blockscale = torch.empty(
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(e, sf_w1_2n, sf_w1_k), device="cuda", dtype=torch.float8_e4m3fn
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)
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w2 = torch.randn((e, k, n), device="cuda", dtype=dtype) / 10
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sf_w2_k = round_up(k, 128)
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sf_w2_n = round_up(n // quant_blocksize, 4)
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w2_blockscale = torch.empty(
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(e, sf_w2_k, sf_w2_n), device="cuda", dtype=torch.float8_e4m3fn
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)
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w1_q = torch.empty((e, 2 * n, k // 2), device="cuda", dtype=torch.uint8)
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w2_q = torch.empty((e, k, n // 2), device="cuda", dtype=torch.uint8)
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w1_gs = torch.empty((e,), device="cuda", dtype=torch.float32)
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w2_gs = torch.empty((e,), device="cuda", dtype=torch.float32)
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for expert in range(e):
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w1_amax = torch.abs(w1).max().to(torch.float32)
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w2_amax = torch.abs(w2).max().to(torch.float32)
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w1_gs[expert] = FLOAT8_E4M3_MAX * FLOAT4_E2M1_MAX / w1_amax
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w2_gs[expert] = FLOAT8_E4M3_MAX * FLOAT4_E2M1_MAX / w2_amax
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w1_q[expert], w1_blockscale[expert] = scaled_fp4_quant(
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w1[expert], w1_gs[expert]
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)
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w2_q[expert], w2_blockscale[expert] = scaled_fp4_quant(
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w2[expert], w2_gs[expert]
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)
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score = torch.randn((m, e), device="cuda", dtype=dtype)
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topk_output = select_experts(
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hidden_states=a,
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router_logits=score,
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topk_config=TopKConfig(top_k=topk, renormalize=False),
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)
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topk_weights, topk_ids, _ = topk_output
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a1_gs = torch.ones((e,), device="cuda", dtype=torch.float32)
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a2_gs = torch.ones((e,), device="cuda", dtype=torch.float32)
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test_output = moe_impl(
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a=a,
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topk_weights=topk_weights,
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topk_ids=topk_ids,
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w1_q=w1_q,
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w2_q=w2_q,
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a1_gs=a1_gs,
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w1_blockscale=w1_blockscale,
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w1_alphas=(1 / w1_gs),
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a2_gs=a2_gs,
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w2_blockscale=w2_blockscale,
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w2_alphas=(1 / w2_gs),
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)
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# Reference check:
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a_global_scale = (
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(FLOAT8_E4M3_MAX * FLOAT4_E2M1_MAX) / torch.amax(a.flatten(), dim=-1)
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).to(torch.float32)
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a_fp4, a_scale_interleaved = scaled_fp4_quant(a, a_global_scale)
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_, m_k = a_fp4.shape
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a_in_dtype = dequantize_nvfp4_to_dtype(
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a_fp4,
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a_scale_interleaved,
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a_global_scale,
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dtype=a.dtype,
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device=a.device,
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block_size=quant_blocksize,
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)
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w1_d = torch.empty((e, 2 * n, k), device="cuda", dtype=dtype)
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w2_d = torch.empty((e, k, n), device="cuda", dtype=dtype)
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for idx in range(0, e):
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w1_d[idx] = dequantize_nvfp4_to_dtype(
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w1_q[idx],
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w1_blockscale[idx],
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w1_gs[idx],
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dtype=w1.dtype,
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device=w1.device,
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block_size=quant_blocksize,
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)
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w2_d[idx] = dequantize_nvfp4_to_dtype(
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w2_q[idx],
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w2_blockscale[idx],
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w2_gs[idx],
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dtype=w2.dtype,
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device=w2.device,
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block_size=quant_blocksize,
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)
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if flip_w13:
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dim = -2
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size = w1_d.size(dim)
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assert size % 2 == 0, f"Expected even size in dim {dim}, got {size}"
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half = size // 2
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# Reorder weight
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w1, w3 = w1_d.split(half, dim=dim)
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w1_d = torch.cat([w3, w1], dim=dim).contiguous()
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torch_output = torch_moe(a_in_dtype, w1_d, w2_d, score, topk, None)
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torch.testing.assert_close(torch_output, test_output, atol=1e-1, rtol=1e-1)
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class TestFlashinferCutedslMoe(unittest.TestCase):
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@unittest.skipIf(SKIP_TEST, SKIP_REASON)
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def test_flashinfer_cutedsl_moe_masked(self):
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# Test parameters
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test_cases = [
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(2, 128, 256, 1),
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(2, 128, 256, 2),
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(2, 128, 256, 4),
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(16, 128, 512, 1),
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(16, 128, 512, 2),
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(16, 128, 512, 4),
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]
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for bs, hidden_dim, inter_dim, topk in test_cases:
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with self.subTest(
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bs=bs, hidden_dim=hidden_dim, inter_dim=inter_dim, topk=topk
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):
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print(
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f"Testing with bs={bs}, hidden_dim={hidden_dim}, inter_dim={inter_dim}, topk={topk}"
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)
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with torch.inference_mode():
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torch.manual_seed(42)
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device = "cuda"
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dtype = torch.bfloat16
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num_experts = 8
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hidden_states = (
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torch.randn(bs, hidden_dim, dtype=torch.bfloat16, device=device)
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/ 5.0
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)
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w1 = (
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torch.randn(
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num_experts,
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2 * inter_dim,
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hidden_dim,
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dtype=torch.bfloat16,
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device=device,
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)
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/ 10.0
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)
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w2 = (
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torch.randn(
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num_experts,
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hidden_dim,
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inter_dim,
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dtype=torch.bfloat16,
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device=device,
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)
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/ 10.0
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)
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router_logits = torch.randn(bs, num_experts, dtype=torch.float32)
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hidden_states_expanded = (
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hidden_states.view(bs, -1, hidden_dim)
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.repeat(1, topk, 1)
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.reshape(-1, hidden_dim)
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)
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hidden_states_3d, masked_m, topk_idx, routing_weights = (
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prepare_inputs(
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hidden_states_expanded, router_logits, num_experts, topk
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)
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)
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w1_amax = w1.abs().amax(dim=(1, 2)).to(torch.float32).to(w1.device)
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w2_amax = w2.abs().amax(dim=(1, 2)).to(torch.float32).to(w2.device)
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input_global_scale = torch.ones(
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(num_experts,), dtype=torch.float32, device=hidden_states.device
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)
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w1_global_scale = FLOAT8_E4M3_MAX * FLOAT4_E2M1_MAX / w1_amax
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w2_global_scale = FLOAT8_E4M3_MAX * FLOAT4_E2M1_MAX / w2_amax
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a2_global_scale = torch.ones(
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(num_experts,), dtype=torch.float32, device=hidden_states.device
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) # assume intermediate scale is 1.0
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w1_fp4, w1_blockscale = scaled_fp4_grouped_quantize(
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w1,
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torch.ones(num_experts, dtype=torch.int32, device=w1.device)
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* 2
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* inter_dim,
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w1_global_scale,
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)
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w2_fp4, w2_blockscale = scaled_fp4_grouped_quantize(
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w2,
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torch.ones(num_experts, dtype=torch.int32, device=w2.device)
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* hidden_dim,
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w2_global_scale,
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)
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w1_alpha = 1.0 / (input_global_scale * w1_global_scale)
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w2_alpha = 1.0 / (a2_global_scale * w2_global_scale)
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out = flashinfer_cutedsl_moe_masked(
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(hidden_states_3d.to(hidden_states.device), None),
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input_global_scale,
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w1_fp4.permute(2, 0, 1),
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w1_blockscale,
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w1_alpha,
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w2_fp4.permute(2, 0, 1),
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a2_global_scale,
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w2_blockscale,
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w2_alpha,
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masked_m.to(hidden_states.device),
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)
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# reference
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a_fp4, a_scale_interleaved = fp4_quantize(
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hidden_states, input_global_scale
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)
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a_in_dtype = dequantize_nvfp4_to_dtype(
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a_fp4,
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a_scale_interleaved,
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input_global_scale,
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dtype=hidden_states.dtype,
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device=hidden_states.device,
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block_size=16,
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)
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w1_d = torch.empty(
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(num_experts, 2 * inter_dim, hidden_dim),
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device=w1.device,
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dtype=w1.dtype,
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)
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w2_d = torch.empty(
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(num_experts, hidden_dim, inter_dim),
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device=w2.device,
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dtype=w2.dtype,
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)
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for idx in range(0, num_experts):
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w1_fp4_sliced, w1_blockscale_sliced = fp4_quantize(
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w1[idx], w1_global_scale[idx]
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)
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w2_fp4_sliced, w2_blockscale_sliced = fp4_quantize(
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w2[idx], w2_global_scale[idx]
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)
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w1_d[idx] = dequantize_nvfp4_to_dtype(
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|
w1_fp4_sliced,
|
|
w1_blockscale_sliced,
|
|
w1_global_scale[idx],
|
|
dtype=w1.dtype,
|
|
device=w1.device,
|
|
block_size=16,
|
|
)
|
|
w2_d[idx] = dequantize_nvfp4_to_dtype(
|
|
w2_fp4_sliced,
|
|
w2_blockscale_sliced,
|
|
w2_global_scale[idx],
|
|
dtype=w2.dtype,
|
|
device=w2.device,
|
|
block_size=16,
|
|
)
|
|
|
|
ref_output = torch_moe_nvfp4(
|
|
a_in_dtype,
|
|
w1_d,
|
|
w2_d,
|
|
topk,
|
|
routing_weights.to(a_in_dtype.device),
|
|
topk_idx.to(a_in_dtype.device),
|
|
)
|
|
out_weighted = torch.zeros_like(
|
|
ref_output, device=out.device, dtype=out.dtype
|
|
)
|
|
|
|
positions = torch.nonzero(masked_m[topk_idx], as_tuple=False)
|
|
rows, cols = positions[:, 0], positions[:, 1]
|
|
experts = topk_idx[rows, cols]
|
|
for i in range(num_experts):
|
|
mask = experts == i
|
|
if mask.any():
|
|
idx = torch.nonzero(mask, as_tuple=False).squeeze(-1)
|
|
r, c = rows[idx], cols[idx]
|
|
out_weighted[r] += out[i, : len(r), :] * routing_weights[
|
|
r, c
|
|
].to(out.device).unsqueeze(-1)
|
|
torch.testing.assert_close(
|
|
out_weighted.cpu(), ref_output.cpu(), atol=5e-2, rtol=5e-2
|
|
)
|
|
print(
|
|
f"Test passed with bs={bs}, hidden_dim={hidden_dim}, inter_dim={inter_dim}, topk={topk}"
|
|
)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|