vllm-project/vllm-omni

[Bug]: run tests/e2e/offline_inference/test_mammoth_moda2_expansion.py, ValueError: Tokenizer class MammothUTokenizer does not exist or is not currently imported.

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#3,201 opened on Apr 28, 2026

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Description

Your current environment

/app/vllm-omni-yn/vllm_omni/version.py:55: RuntimeWarning: vLLM and vLLM-Omni appear to have mismatched major/minor versions:
 --> vLLM-Omni version 0.1.dev1375+g1da3f942b
 --> vLLM version 0.19.0
This will likely cause compatibility issues.
  warn_if_misaligned_vllm_version()
==============================
        System Info
==============================
OS                           : Ubuntu 22.04.5 LTS (x86_64)
GCC version                  : (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
Clang version                : Could not collect
CMake version                : Could not collect
Libc version                 : glibc-2.35

==============================
       PyTorch Info
==============================
PyTorch version              : 2.10.0+cu128
Is debug build               : False
CUDA used to build PyTorch   : 12.8
ROCM used to build PyTorch   : N/A

==============================
      Python Environment
==============================
Python version               : 3.12.12 (main, Feb 12 2026, 00:42:14) [Clang 21.1.4 ] (64-bit runtime)
Python platform              : Linux-5.15.0-1053-nvidia-x86_64-with-glibc2.35

==============================
       CUDA / GPU Info
==============================
Is CUDA available            : True
CUDA runtime version         : 12.9.41
CUDA_MODULE_LOADING set to   :
GPU models and configuration :
GPU 0: NVIDIA H800
GPU 1: NVIDIA H800
GPU 2: NVIDIA H800
GPU 3: NVIDIA H800
GPU 4: NVIDIA H800
GPU 5: NVIDIA H800
GPU 6: NVIDIA H800
GPU 7: NVIDIA H800

Nvidia driver version        : 535.161.08
cuDNN version                : Could not collect
HIP runtime version          : N/A
MIOpen runtime version       : N/A
Is XNNPACK available         : True

==============================
          CPU Info
==============================
Architecture:                       x86_64
CPU op-mode(s):                     32-bit, 64-bit
Address sizes:                      52 bits physical, 57 bits virtual
Byte Order:                         Little Endian
CPU(s):                             224
On-line CPU(s) list:                0-223
Vendor ID:                          GenuineIntel
Model name:                         Intel(R) Xeon(R) Platinum 8480C
CPU family:                         6
Model:                              143
Thread(s) per core:                 2
Core(s) per socket:                 56
Socket(s):                          2
Stepping:                           8
CPU max MHz:                        3800.0000
CPU min MHz:                        800.0000
BogoMIPS:                           4000.00
Flags:                              fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cat_l2 cdp_l3 invpcid_single intel_ppin cdp_l2 ssbd mba ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cqm rdt_a avx512f avx512dq rdseed adx smap avx512ifma clflushopt clwb intel_pt avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local split_lock_detect avx_vnni avx512_bf16 wbnoinvd dtherm ida arat pln pts hwp hwp_act_window hwp_epp hwp_pkg_req avx512vbmi umip pku ospke waitpkg avx512_vbmi2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg tme avx512_vpopcntdq la57 rdpid bus_lock_detect cldemote movdiri movdir64b enqcmd fsrm md_clear serialize tsxldtrk pconfig arch_lbr amx_bf16 avx512_fp16 amx_tile amx_int8 flush_l1d arch_capabilities
Virtualization:                     VT-x
L1d cache:                          5.3 MiB (112 instances)
L1i cache:                          3.5 MiB (112 instances)
L2 cache:                           224 MiB (112 instances)
L3 cache:                           210 MiB (2 instances)
NUMA node(s):                       2
NUMA node0 CPU(s):                  0-55,112-167
NUMA node1 CPU(s):                  56-111,168-223
Vulnerability Gather data sampling: Not affected
Vulnerability Itlb multihit:        Not affected
Vulnerability L1tf:                 Not affected
Vulnerability Mds:                  Not affected
Vulnerability Meltdown:             Not affected
Vulnerability Mmio stale data:      Not affected
Vulnerability Retbleed:             Not affected
Vulnerability Spec rstack overflow: Not affected
Vulnerability Spec store bypass:    Mitigation; Speculative Store Bypass disabled via prctl and seccomp
Vulnerability Spectre v1:           Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2:           Mitigation; Enhanced IBRS, IBPB conditional, RSB filling, PBRSB-eIBRS SW sequence
Vulnerability Srbds:                Not affected
Vulnerability Tsx async abort:      Not affected

==============================
Versions of relevant libraries
==============================
[pip3] flashinfer-python==0.6.6
[pip3] mypy==1.11.1
[pip3] mypy_extensions==1.1.0
[pip3] numpy==2.2.6
[pip3] nvidia-cublas-cu12==12.8.4.1
[pip3] nvidia-cuda-cupti-cu12==12.8.90
[pip3] nvidia-cuda-nvrtc-cu12==12.8.93
[pip3] nvidia-cuda-runtime-cu12==12.8.90
[pip3] nvidia-cudnn-cu12==9.10.2.21
[pip3] nvidia-cudnn-frontend==1.18.0
[pip3] nvidia-cufft-cu12==11.3.3.83
[pip3] nvidia-cufile-cu12==1.13.1.3
[pip3] nvidia-curand-cu12==10.3.9.90
[pip3] nvidia-cusolver-cu12==11.7.3.90
[pip3] nvidia-cusparse-cu12==12.5.8.93
[pip3] nvidia-cusparselt-cu12==0.7.1
[pip3] nvidia-cutlass-dsl==4.4.2
[pip3] nvidia-cutlass-dsl-libs-base==4.4.2
[pip3] nvidia-ml-py==13.595.45
[pip3] nvidia-nccl-cu12==2.27.5
[pip3] nvidia-nvjitlink-cu12==12.8.93
[pip3] nvidia-nvshmem-cu12==3.4.5
[pip3] nvidia-nvtx-cu12==12.8.90
[pip3] onnxruntime==1.24.2
[pip3] pytorch-wpe==0.0.1
[pip3] pyzmq==27.1.0
[pip3] torch==2.10.0
[pip3] torch_c_dlpack_ext==0.1.5
[pip3] torch-complex==0.4.4
[pip3] torch-einops-utils==0.0.30
[pip3] torchaudio==2.10.0
[pip3] torchcodec==0.11.1
[pip3] torchmetrics==1.9.0
[pip3] torchsde==0.2.6
[pip3] torchvision==0.25.0
[pip3] transformers==4.57.6
[pip3] triton==3.6.0
[pip3] x-transformers==2.18.9
[conda] Could not collect

==============================
         vLLM Info
==============================
ROCM Version                 : Could not collect
vLLM Version                 : 0.19.0
vLLM-Omni Version            : 0.1.dev1375+g1da3f942b (git sha: 1da3f942b)
vLLM Build Flags:
  CUDA Archs: Not Set; ROCm: Disabled
GPU Topology:
        GPU0    GPU1    GPU2    GPU3    GPU4    GPU5    GPU6    GPU7    NIC0    NIC1    NIC2    NIC3    NIC4    NIC5   NIC6     NIC7    NIC8    NIC9    NIC10   NIC11   CPU Affinity    NUMA Affinity   GPU NUMA ID
GPU0     X      NV8     NV8     NV8     NV8     NV8     NV8     NV8     PXB     NODE    NODE    NODE    NODE    NODE   SYS      SYS     SYS     SYS     SYS     SYS     0-55,112-167    0               N/A
GPU1    NV8      X      NV8     NV8     NV8     NV8     NV8     NV8     NODE    NODE    NODE    PXB     NODE    NODE   SYS      SYS     SYS     SYS     SYS     SYS     0-55,112-167    0               N/A
GPU2    NV8     NV8      X      NV8     NV8     NV8     NV8     NV8     NODE    NODE    NODE    NODE    PXB     NODE   SYS      SYS     SYS     SYS     SYS     SYS     0-55,112-167    0               N/A
GPU3    NV8     NV8     NV8      X      NV8     NV8     NV8     NV8     NODE    NODE    NODE    NODE    NODE    PXB    SYS      SYS     SYS     SYS     SYS     SYS     0-55,112-167    0               N/A
GPU4    NV8     NV8     NV8     NV8      X      NV8     NV8     NV8     SYS     SYS     SYS     SYS     SYS     SYS    PXB      NODE    NODE    NODE    NODE    NODE    56-111,168-223  1               N/A
GPU5    NV8     NV8     NV8     NV8     NV8      X      NV8     NV8     SYS     SYS     SYS     SYS     SYS     SYS    NODE     NODE    NODE    PXB     NODE    NODE    56-111,168-223  1               N/A
GPU6    NV8     NV8     NV8     NV8     NV8     NV8      X      NV8     SYS     SYS     SYS     SYS     SYS     SYS    NODE     NODE    NODE    NODE    PXB     NODE    56-111,168-223  1               N/A
GPU7    NV8     NV8     NV8     NV8     NV8     NV8     NV8      X      SYS     SYS     SYS     SYS     SYS     SYS    NODE     NODE    NODE    NODE    NODE    PXB     56-111,168-223  1               N/A
NIC0    PXB     NODE    NODE    NODE    SYS     SYS     SYS     SYS      X      NODE    NODE    NODE    NODE    NODE   SYS      SYS     SYS     SYS     SYS     SYS
NIC1    NODE    NODE    NODE    NODE    SYS     SYS     SYS     SYS     NODE     X      PIX     NODE    NODE    NODE   SYS      SYS     SYS     SYS     SYS     SYS
NIC2    NODE    NODE    NODE    NODE    SYS     SYS     SYS     SYS     NODE    PIX      X      NODE    NODE    NODE   SYS      SYS     SYS     SYS     SYS     SYS
NIC3    NODE    PXB     NODE    NODE    SYS     SYS     SYS     SYS     NODE    NODE    NODE     X      NODE    NODE   SYS      SYS     SYS     SYS     SYS     SYS
NIC4    NODE    NODE    PXB     NODE    SYS     SYS     SYS     SYS     NODE    NODE    NODE    NODE     X      NODE   SYS      SYS     SYS     SYS     SYS     SYS
NIC5    NODE    NODE    NODE    PXB     SYS     SYS     SYS     SYS     NODE    NODE    NODE    NODE    NODE     X     SYS      SYS     SYS     SYS     SYS     SYS
NIC6    SYS     SYS     SYS     SYS     PXB     NODE    NODE    NODE    SYS     SYS     SYS     SYS     SYS     SYS     X       NODE    NODE    NODE    NODE    NODE
NIC7    SYS     SYS     SYS     SYS     NODE    NODE    NODE    NODE    SYS     SYS     SYS     SYS     SYS     SYS    NODE      X      PIX     NODE    NODE    NODE
NIC8    SYS     SYS     SYS     SYS     NODE    NODE    NODE    NODE    SYS     SYS     SYS     SYS     SYS     SYS    NODE     PIX      X      NODE    NODE    NODE
NIC9    SYS     SYS     SYS     SYS     NODE    PXB     NODE    NODE    SYS     SYS     SYS     SYS     SYS     SYS    NODE     NODE    NODE     X      NODE    NODE
NIC10   SYS     SYS     SYS     SYS     NODE    NODE    PXB     NODE    SYS     SYS     SYS     SYS     SYS     SYS    NODE     NODE    NODE    NODE     X      NODE
NIC11   SYS     SYS     SYS     SYS     NODE    NODE    NODE    PXB     SYS     SYS     SYS     SYS     SYS     SYS    NODE     NODE    NODE    NODE    NODE     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
  NIC4: mlx5_4
  NIC5: mlx5_5
  NIC6: mlx5_6
  NIC7: mlx5_7
  NIC8: mlx5_8
  NIC9: mlx5_9
  NIC10: mlx5_10
  NIC11: mlx5_11

==============================
     Environment Variables
==============================
NVIDIA_VISIBLE_DEVICES=all
NVIDIA_REQUIRE_CUDA=cuda>=12.9 brand=unknown,driver>=535,driver<536 brand=grid,driver>=535,driver<536 brand=tesla,driver>=535,driver<536 brand=nvidia,driver>=535,driver<536 brand=quadro,driver>=535,driver<536 brand=quadrortx,driver>=535,driver<536 brand=nvidiartx,driver>=535,driver<536 brand=vapps,driver>=535,driver<536 brand=vpc,driver>=535,driver<536 brand=vcs,driver>=535,driver<536 brand=vws,driver>=535,driver<536 brand=cloudgaming,driver>=535,driver<536 brand=unknown,driver>=550,driver<551 brand=grid,driver>=550,driver<551 brand=tesla,driver>=550,driver<551 brand=nvidia,driver>=550,driver<551 brand=quadro,driver>=550,driver<551 brand=quadrortx,driver>=550,driver<551 brand=nvidiartx,driver>=550,driver<551 brand=vapps,driver>=550,driver<551 brand=vpc,driver>=550,driver<551 brand=vcs,driver>=550,driver<551 brand=vws,driver>=550,driver<551 brand=cloudgaming,driver>=550,driver<551 brand=unknown,driver>=560,driver<561 brand=grid,driver>=560,driver<561 brand=tesla,driver>=560,driver<561 brand=nvidia,driver>=560,driver<561 brand=quadro,driver>=560,driver<561 brand=quadrortx,driver>=560,driver<561 brand=nvidiartx,driver>=560,driver<561 brand=vapps,driver>=560,driver<561 brand=vpc,driver>=560,driver<561 brand=vcs,driver>=560,driver<561 brand=vws,driver>=560,driver<561 brand=cloudgaming,driver>=560,driver<561 brand=unknown,driver>=565,driver<566 brand=grid,driver>=565,driver<566 brand=tesla,driver>=565,driver<566 brand=nvidia,driver>=565,driver<566 brand=quadro,driver>=565,driver<566 brand=quadrortx,driver>=565,driver<566 brand=nvidiartx,driver>=565,driver<566 brand=vapps,driver>=565,driver<566 brand=vpc,driver>=565,driver<566 brand=vcs,driver>=565,driver<566 brand=vws,driver>=565,driver<566 brand=cloudgaming,driver>=565,driver<566 brand=unknown,driver>=570,driver<571 brand=grid,driver>=570,driver<571 brand=tesla,driver>=570,driver<571 brand=nvidia,driver>=570,driver<571 brand=quadro,driver>=570,driver<571 brand=quadrortx,driver>=570,driver<571 brand=nvidiartx,driver>=570,driver<571 brand=vapps,driver>=570,driver<571 brand=vpc,driver>=570,driver<571 brand=vcs,driver>=570,driver<571 brand=vws,driver>=570,driver<571 brand=cloudgaming,driver>=570,driver<571
VLLM_ALLOW_LONG_MAX_MODEL_LEN=1
NCCL_VERSION=2.26.5-1
NVIDIA_DRIVER_CAPABILITIES=compute,utility
NVIDIA_PRODUCT_NAME=CUDA
CUDA_VERSION=12.9.0
CUDA_VISIBLE_DEVICES=5
CUDA_VISIBLE_DEVICES=5
LD_LIBRARY_PATH=/app/vllm-omni/.venv/lib/python3.12/site-packages/cv2/../../lib64:/usr/local/cuda/lib64
PYTORCH_NVML_BASED_CUDA_CHECK=1
TORCHINDUCTOR_COMPILE_THREADS=1
TORCHINDUCTOR_CACHE_DIR=/tmp/torchinductor_root

Your code version

0.19.0

335e2eb9e44c367cc91b98f422ea084bede6711d

🐛 Describe the bug

Run Steps

pytest -sv tests/e2e/offline_inference/test_mammoth_moda2_expansion.py -m advanced_model --run-level advanced_model

ERROR

[rank0]:[W428 03:26:12.297748082 ProcessGroupNCCL.cpp:1553] Warning: WARNING: destroy_process_group() was not called before program exit, which can leak resources. For more info, please see https://pytorch.org/docs/stable/distributed.html#shutdown (function operator())
ERROR 04-28 03:26:13 [async_omni_engine.py:874] [AsyncOmniEngine] Stage initialization failed; shutting down 0 initialized stage(s)
ERROR 04-28 03:26:13 [async_omni_engine.py:874] Traceback (most recent call last):
ERROR 04-28 03:26:13 [async_omni_engine.py:874]   File "/app/vllm-omni-yn/vllm_omni/engine/async_omni_engine.py", line 858, in _initialize_stages
ERROR 04-28 03:26:13 [async_omni_engine.py:874]     stage_client, output_processor, vllm_config, stage0_input_processor = future.result()
ERROR 04-28 03:26:13 [async_omni_engine.py:874]                                                                           ^^^^^^^^^^^^^^^
ERROR 04-28 03:26:13 [async_omni_engine.py:874]   File "/root/.local/share/uv/python/cpython-3.12.12-linux-x86_64-gnu/lib/python3.12/concurrent/futures/_base.py", line 449, in result
ERROR 04-28 03:26:13 [async_omni_engine.py:874]     return self.__get_result()
ERROR 04-28 03:26:13 [async_omni_engine.py:874]            ^^^^^^^^^^^^^^^^^^^
ERROR 04-28 03:26:13 [async_omni_engine.py:874]   File "/root/.local/share/uv/python/cpython-3.12.12-linux-x86_64-gnu/lib/python3.12/concurrent/futures/_base.py", line 401, in __get_result
ERROR 04-28 03:26:13 [async_omni_engine.py:874]     raise self._exception
ERROR 04-28 03:26:13 [async_omni_engine.py:874]   File "/root/.local/share/uv/python/cpython-3.12.12-linux-x86_64-gnu/lib/python3.12/concurrent/futures/thread.py", line 59, in run
ERROR 04-28 03:26:13 [async_omni_engine.py:874]     result = self.fn(*self.args, **self.kwargs)
ERROR 04-28 03:26:13 [async_omni_engine.py:874]              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ERROR 04-28 03:26:13 [async_omni_engine.py:874]   File "/app/vllm-omni-yn/vllm_omni/engine/async_omni_engine.py", line 644, in _attach_llm_stage
ERROR 04-28 03:26:13 [async_omni_engine.py:874]     tokenizer = cached_tokenizer_from_config(
ERROR 04-28 03:26:13 [async_omni_engine.py:874]                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ERROR 04-28 03:26:13 [async_omni_engine.py:874]   File "/app/vllm-omni/.venv/lib/python3.12/site-packages/vllm/tokenizers/registry.py", line 227, in cached_tokenizer_from_config
ERROR 04-28 03:26:13 [async_omni_engine.py:874]     return cached_get_tokenizer(
ERROR 04-28 03:26:13 [async_omni_engine.py:874]            ^^^^^^^^^^^^^^^^^^^^^
ERROR 04-28 03:26:13 [async_omni_engine.py:874]   File "/app/vllm-omni/.venv/lib/python3.12/site-packages/vllm/tokenizers/registry.py", line 210, in get_tokenizer
ERROR 04-28 03:26:13 [async_omni_engine.py:874]     tokenizer = tokenizer_cls_.from_pretrained(tokenizer_name, *args, **kwargs)
ERROR 04-28 03:26:13 [async_omni_engine.py:874]                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ERROR 04-28 03:26:13 [async_omni_engine.py:874]   File "/app/vllm-omni/.venv/lib/python3.12/site-packages/vllm/tokenizers/hf.py", line 110, in from_pretrained
ERROR 04-28 03:26:13 [async_omni_engine.py:874]     raise e
ERROR 04-28 03:26:13 [async_omni_engine.py:874]   File "/app/vllm-omni/.venv/lib/python3.12/site-packages/vllm/tokenizers/hf.py", line 85, in from_pretrained
ERROR 04-28 03:26:13 [async_omni_engine.py:874]     tokenizer = AutoTokenizer.from_pretrained(
ERROR 04-28 03:26:13 [async_omni_engine.py:874]                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ERROR 04-28 03:26:13 [async_omni_engine.py:874]   File "/app/vllm-omni/.venv/lib/python3.12/site-packages/transformers/models/auto/tokenization_auto.py", line 1153, in from_pretrained
ERROR 04-28 03:26:13 [async_omni_engine.py:874]     raise ValueError(
ERROR 04-28 03:26:13 [async_omni_engine.py:874] ValueError: Tokenizer class MammothUTokenizer does not exist or is not currently imported.
ERROR 04-28 03:26:13 [async_omni_engine.py:948] [AsyncOmniEngine] Orchestrator thread crashed
ERROR 04-28 03:26:13 [async_omni_engine.py:948] Traceback (most recent call last):
ERROR 04-28 03:26:13 [async_omni_engine.py:948]   File "/app/vllm-omni-yn/vllm_omni/engine/async_omni_engine.py", line 942, in _bootstrap_orchestrator
ERROR 04-28 03:26:13 [async_omni_engine.py:948]     loop.run_until_complete(_run_orchestrator())
ERROR 04-28 03:26:13 [async_omni_engine.py:948]   File "/root/.local/share/uv/python/cpython-3.12.12-linux-x86_64-gnu/lib/python3.12/asyncio/base_events.py", line 691, in run_until_complete
ERROR 04-28 03:26:13 [async_omni_engine.py:948]     return future.result()
ERROR 04-28 03:26:13 [async_omni_engine.py:948]            ^^^^^^^^^^^^^^^
ERROR 04-28 03:26:13 [async_omni_engine.py:948]   File "/app/vllm-omni-yn/vllm_omni/engine/async_omni_engine.py", line 925, in _run_orchestrator
ERROR 04-28 03:26:13 [async_omni_engine.py:948]     self._initialize_stages(stage_init_timeout)
ERROR 04-28 03:26:13 [async_omni_engine.py:948]   File "/app/vllm-omni-yn/vllm_omni/engine/async_omni_engine.py", line 858, in _initialize_stages
ERROR 04-28 03:26:13 [async_omni_engine.py:948]     stage_client, output_processor, vllm_config, stage0_input_processor = future.result()
ERROR 04-28 03:26:13 [async_omni_engine.py:948]                                                                           ^^^^^^^^^^^^^^^
ERROR 04-28 03:26:13 [async_omni_engine.py:948]   File "/root/.local/share/uv/python/cpython-3.12.12-linux-x86_64-gnu/lib/python3.12/concurrent/futures/_base.py", line 449, in result
ERROR 04-28 03:26:13 [async_omni_engine.py:948]     return self.__get_result()
ERROR 04-28 03:26:13 [async_omni_engine.py:948]            ^^^^^^^^^^^^^^^^^^^
ERROR 04-28 03:26:13 [async_omni_engine.py:948]   File "/root/.local/share/uv/python/cpython-3.12.12-linux-x86_64-gnu/lib/python3.12/concurrent/futures/_base.py", line 401, in __get_result
ERROR 04-28 03:26:13 [async_omni_engine.py:948]     raise self._exception
ERROR 04-28 03:26:13 [async_omni_engine.py:948]   File "/root/.local/share/uv/python/cpython-3.12.12-linux-x86_64-gnu/lib/python3.12/concurrent/futures/thread.py", line 59, in run
ERROR 04-28 03:26:13 [async_omni_engine.py:948]     result = self.fn(*self.args, **self.kwargs)
ERROR 04-28 03:26:13 [async_omni_engine.py:948]              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ERROR 04-28 03:26:13 [async_omni_engine.py:948]   File "/app/vllm-omni-yn/vllm_omni/engine/async_omni_engine.py", line 644, in _attach_llm_stage
ERROR 04-28 03:26:13 [async_omni_engine.py:948]     tokenizer = cached_tokenizer_from_config(
ERROR 04-28 03:26:13 [async_omni_engine.py:948]                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ERROR 04-28 03:26:13 [async_omni_engine.py:948]   File "/app/vllm-omni/.venv/lib/python3.12/site-packages/vllm/tokenizers/registry.py", line 227, in cached_tokenizer_from_config
ERROR 04-28 03:26:13 [async_omni_engine.py:948]     return cached_get_tokenizer(
ERROR 04-28 03:26:13 [async_omni_engine.py:948]            ^^^^^^^^^^^^^^^^^^^^^
ERROR 04-28 03:26:13 [async_omni_engine.py:948]   File "/app/vllm-omni/.venv/lib/python3.12/site-packages/vllm/tokenizers/registry.py", line 210, in get_tokenizer
ERROR 04-28 03:26:13 [async_omni_engine.py:948]     tokenizer = tokenizer_cls_.from_pretrained(tokenizer_name, *args, **kwargs)
ERROR 04-28 03:26:13 [async_omni_engine.py:948]                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ERROR 04-28 03:26:13 [async_omni_engine.py:948]   File "/app/vllm-omni/.venv/lib/python3.12/site-packages/vllm/tokenizers/hf.py", line 110, in from_pretrained
ERROR 04-28 03:26:13 [async_omni_engine.py:948]     raise e
ERROR 04-28 03:26:13 [async_omni_engine.py:948]   File "/app/vllm-omni/.venv/lib/python3.12/site-packages/vllm/tokenizers/hf.py", line 85, in from_pretrained
ERROR 04-28 03:26:13 [async_omni_engine.py:948]     tokenizer = AutoTokenizer.from_pretrained(
ERROR 04-28 03:26:13 [async_omni_engine.py:948]                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ERROR 04-28 03:26:13 [async_omni_engine.py:948]   File "/app/vllm-omni/.venv/lib/python3.12/site-packages/transformers/models/auto/tokenization_auto.py", line 1153, in from_pretrained
ERROR 04-28 03:26:13 [async_omni_engine.py:948]     raise ValueError(
ERROR 04-28 03:26:13 [async_omni_engine.py:948] ValueError: Tokenizer class MammothUTokenizer does not exist or is not currently imported.
INFO 04-28 03:26:13 [async_omni_engine.py:1757] [AsyncOmniEngine] Shutting down Orchestrator

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Contributor guide

Research direction
Investigate how tokenizer classes are registered and imported for offline inference tests. Look for existing tokenizer definitions and the import path, then identify why MammothUTokenizer is not available in the test environment.
Tech stack
pythonpytorch
Domain
backendtesting
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
PythonGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75