[Bug] circular import error in fused_moe_triton

[BBuf]

Checklist

• 1. I have searched related issues but cannot get the expected help.
• 2. The bug has not been fixed in the latest version.
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Describe the bug

circular import error in fused_moe_triton

root@dlc1ps6tjbkpwsvv-master-0:/mnt/data/bbuf/sglang# python3
Python 3.10.12 (main, Jun 11 2023, 05:26:28) [GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from sglang.srt.layers.fused_moe_triton.fused_moe import fused_moe
Warning: Your installation of OpenCV appears to be broken: module 'cv2.dnn' has no attribute 'DictValue'.Please follow the instructions at https://github.com/opencv/opencv-python/issues/884 to correct your environment. The import of cv2 has been skipped.
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/mnt/data/bbuf/sglang/python/sglang/srt/layers/fused_moe_triton/__init__.py", line 11, in <module>
    from sglang.srt.layers.fused_moe_triton.layer import (
  File "/mnt/data/bbuf/sglang/python/sglang/srt/layers/fused_moe_triton/layer.py", line 16, in <module>
    from sglang.srt.layers.quantization.base_config import (
  File "/mnt/data/bbuf/sglang/python/sglang/srt/layers/quantization/__init__.py", line 25, in <module>
    from sglang.srt.layers.quantization.fp8 import Fp8Config, Fp8MoEMethod
  File "/mnt/data/bbuf/sglang/python/sglang/srt/layers/quantization/fp8.py", line 27, in <module>
    from sglang.srt.layers.fused_moe_triton import (
ImportError: cannot import name 'FusedMoE' from partially initialized module 'sglang.srt.layers.fused_moe_triton' (most likely due to a circular import) (/mnt/data/bbuf/sglang/python/sglang/srt/layers/fused_moe_triton/__init__.py)
>>> 

Reproduction

python3 
from sglang.srt.layers.fused_moe_triton.fused_moe import fused_moe

Environment

WARNING:mistral_common.tokens.tokenizers.multimodal:Warning: Your installation of OpenCV appears to be broken: module 'cv2.dnn' has no attribute 'DictValue'.Please follow the instructions at opencv/opencv-python#884 to correct your environment. The import of cv2 has been skipped.
Python: 3.10.12 (main, Jun 11 2023, 05:26:28) [GCC 11.4.0]
CUDA available: True
GPU 0,1,2,3,4,5,6,7: NVIDIA A800-SXM4-80GB
GPU 0,1,2,3,4,5,6,7 Compute Capability: 8.0
CUDA_HOME: /usr/local/cuda
NVCC: Cuda compilation tools, release 12.3, V12.3.52
CUDA Driver Version: 535.54.03
PyTorch: 2.5.1+cu124
sglang: 0.4.0.post1
flashinfer: 0.1.6+cu121torch2.4
triton: 3.1.0
transformers: 4.47.0
torchao: 0.5.0
numpy: 1.26.4
aiohttp: 3.8.6
fastapi: 0.115.0
hf_transfer: 0.1.8
huggingface_hub: 0.24.6
interegular: 0.3.3
modelscope: 1.18.1
orjson: 3.10.12
packaging: 23.2
psutil: 5.9.4
pydantic: 2.9.0
multipart: 0.0.9
zmq: 26.2.0
uvicorn: 0.30.6
uvloop: 0.20.0
vllm: 0.6.4.post1
openai: 1.46.0
anthropic: 0.34.2
decord: 0.6.0
NVIDIA Topology:
GPU0 GPU1 GPU2 GPU3 GPU4 GPU5 GPU6 GPU7 NIC0 NIC1 NIC2 NIC3 CPU Affinity NUMA Affinity GPU NUMA ID
GPU0 X NV8 NV8 NV8 NV8 NV8 NV8 NV8 PHB PHB PHB PHB 0-31 N/A N/A
GPU1 NV8 X NV8 NV8 NV8 NV8 NV8 NV8 PHB PHB PHB PHB 0-31 N/A N/A
GPU2 NV8 NV8 X NV8 NV8 NV8 NV8 NV8 PHB PHB PHB PHB 0-31 N/A N/A
GPU3 NV8 NV8 NV8 X NV8 NV8 NV8 NV8 PHB PHB PHB PHB 0-31 N/A N/A
GPU4 NV8 NV8 NV8 NV8 X NV8 NV8 NV8 PHB PHB PHB PHB 0-31 N/A N/A
GPU5 NV8 NV8 NV8 NV8 NV8 X NV8 NV8 PHB PHB PHB PHB 0-31 N/A N/A
GPU6 NV8 NV8 NV8 NV8 NV8 NV8 X NV8 PHB PHB PHB PHB 0-31 N/A N/A
GPU7 NV8 NV8 NV8 NV8 NV8 NV8 NV8 X PHB PHB PHB PHB 0-31 N/A N/A
NIC0 PHB PHB PHB PHB PHB PHB PHB PHB X PHB PHB PHB
NIC1 PHB PHB PHB PHB PHB PHB PHB PHB PHB X PHB PHB
NIC2 PHB PHB PHB PHB PHB PHB PHB PHB PHB PHB X PHB
NIC3 PHB PHB PHB PHB PHB PHB PHB PHB PHB PHB PHB X

Legend:

X = Self
SYS = Connection traversing PCIe as well as the SMP interconnect between NUMA nodes (e.g., QPI/UPI)
NODE = Connection traversing PCIe as well as the interconnect between PCIe Host Bridges within a NUMA node
PHB = Connection traversing PCIe as well as a PCIe Host Bridge (typically the CPU)
PXB = Connection traversing multiple PCIe bridges (without traversing the PCIe Host Bridge)
PIX = Connection traversing at most a single PCIe bridge
NV# = Connection traversing a bonded set of # NVLinks

NIC Legend:

NIC0: mlx5_0
NIC1: mlx5_1
NIC2: mlx5_2
NIC3: mlx5_3

Hypervisor vendor: KVM
ulimit soft: 102400

[zhyncs]

It has been fixed with #2387