[Docs] Fix a link and grammar issue in production-stack.md (#16809)

Signed-off-by: windsonsea <haifeng.yao@daocloud.io>

.buildkite/scripts/hardware_ci/run-tpu-v1-test.sh

@@ -17,10 +17,12 @@ source /etc/environment
 docker run --privileged --net host --shm-size=16G -it \
     -e "HF_TOKEN=$HF_TOKEN" --name tpu-test \
     vllm-tpu /bin/bash -c "python3 -m pip install git+https://github.com/thuml/depyf.git \
-    && python3 -m pip install pytest \
+    && python3 -m pip install pytest tpu-info \
     && python3 -m pip install lm_eval[api]==0.4.4 \
     && export VLLM_USE_V1=1 \
     && export VLLM_XLA_CHECK_RECOMPILATION=1 \
+    && echo HARDWARE \
+    && tpu-info \
     && echo TEST_0 \
     && pytest -v -s /workspace/vllm/tests/v1/tpu/test_perf.py \
     && echo TEST_1 \

.github/ISSUE_TEMPLATE/200-installation.yml

@@ -14,7 +14,7 @@ body:
     description: |
       Please run the following and paste the output below.
       ```sh
-      wget https://raw.githubusercontent.com/vllm-project/vllm/main/collect_env.py
+      wget https://raw.githubusercontent.com/vllm-project/vllm/main/vllm/collect_env.py
       # For security purposes, please feel free to check the contents of collect_env.py before running it.
       python collect_env.py
       ```

.github/ISSUE_TEMPLATE/300-usage.yml

@@ -14,7 +14,7 @@ body:
     description: |
       Please run the following and paste the output below.
       ```sh
-      wget https://raw.githubusercontent.com/vllm-project/vllm/main/collect_env.py
+      wget https://raw.githubusercontent.com/vllm-project/vllm/main/vllm/collect_env.py
       # For security purposes, please feel free to check the contents of collect_env.py before running it.
       python collect_env.py
       ```

.github/ISSUE_TEMPLATE/400-bug-report.yml

@@ -14,7 +14,7 @@ body:
     description: |
       Please run the following and paste the output below.
       ```sh
-      wget https://raw.githubusercontent.com/vllm-project/vllm/main/collect_env.py
+      wget https://raw.githubusercontent.com/vllm-project/vllm/main/vllm/collect_env.py
       # For security purposes, please feel free to check the contents of collect_env.py before running it.
       python collect_env.py
       ```

.github/ISSUE_TEMPLATE/700-performance-discussion.yml

@@ -35,7 +35,7 @@ body:
     description: |
       Please run the following and paste the output below.
       ```sh
-      wget https://raw.githubusercontent.com/vllm-project/vllm/main/collect_env.py
+      wget https://raw.githubusercontent.com/vllm-project/vllm/main/vllm/collect_env.py
       # For security purposes, please feel free to check the contents of collect_env.py before running it.
       python collect_env.py
       ```

csrc/moe/moe_wna16.cu

@@ -13,7 +13,6 @@
 template <typename scalar_t, int bit, int GROUPS>
 __global__ void moe_wna16_gemm_kernel(
     const scalar_t* __restrict__ input, scalar_t* __restrict__ output,
-
     const uint32_t* __restrict__ qweight, const scalar_t* __restrict__ scales,
     const uint32_t* __restrict__ qzeros,
 
@@ -54,8 +53,6 @@ __global__ void moe_wna16_gemm_kernel(
       if (token_index / top_k >= size_m) break;
 
       num_valid_tokens = m + 1;
-      if (blockIdx.z == 0 && offset_n < size_n)
-        output[token_index * size_n + offset_n] = Dtype::int2num(0);
 
       if (expert_id != -1) {
         int k_per_thread = DIVIDE(BLOCK_SIZE_K, BLOCK_SIZE_N);
@@ -284,8 +281,7 @@ torch::Tensor moe_wna16_gemm(torch::Tensor input, torch::Tensor output,
                              int64_t BLOCK_SIZE_M, int64_t BLOCK_SIZE_N,
                              int64_t BLOCK_SIZE_K, int64_t bit) {
   const at::cuda::OptionalCUDAGuard device_guard(device_of(input));
-  auto options =
-      torch::TensorOptions().dtype(input.dtype()).device(input.device());
+  output.zero_();
 
   const int num_experts = b_qweight.size(0);
   const int size_m = input.size(0);
@@ -302,9 +298,9 @@ torch::Tensor moe_wna16_gemm(torch::Tensor input, torch::Tensor output,
   const uint32_t* b_qzeros_ptr;
   if (b_qzeros.has_value())
     b_qzeros_ptr = (const uint32_t*)b_qzeros.value().data_ptr<uint8_t>();
-  const float* topk_weights_ptr;
+  const float* topk_weights_ptr = nullptr;
   if (topk_weights.has_value())
-    topk_weights_ptr = (const float*)topk_weights.value().data_ptr();
+    topk_weights_ptr = (const float*)topk_weights.value().data_ptr<float>();
 
   int groups_per_block_row = BLOCK_SIZE_K / group_size;
   TORCH_CHECK(bit == 4 || bit == 8, "bit must be 4 or 8");

docker/Dockerfile

@@ -241,6 +241,7 @@ if [ "$TARGETPLATFORM" != "linux/arm64" ]; then \
 fi
 COPY examples examples
 COPY benchmarks benchmarks
+COPY ./vllm/collect_env.py .
 
 # Although we build Flashinfer with AOT mode, there's still
 # some issues w.r.t. JIT compilation. Therefore we need to

docker/Dockerfile.cpu

@@ -121,6 +121,7 @@ RUN --mount=type=cache,target=/root/.cache/uv \
 ADD ./tests/ ./tests/
 ADD ./examples/ ./examples/
 ADD ./benchmarks/ ./benchmarks/
+ADD ./vllm/collect_env.py .
 
 # install development dependencies (for testing)
 RUN --mount=type=cache,target=/root/.cache/uv \

docs/source/deployment/docker.md

@@ -19,6 +19,18 @@ $ docker run --runtime nvidia --gpus all \
     --model mistralai/Mistral-7B-v0.1
 ```
 
+This image can also be used with other container engines such as [Podman](https://podman.io/).
+
+```console
+$ podman run --gpus all \
+  -v ~/.cache/huggingface:/root/.cache/huggingface \
+  --env "HUGGING_FACE_HUB_TOKEN=$HF_TOKEN" \
+  -p 8000:8000 \
+  --ipc=host \
+  vllm/vllm-openai:latest \
+  --model mistralai/Mistral-7B-v0.1
+```
+
 You can add any other <project:#engine-args> you need after the image tag (`vllm/vllm-openai:latest`).
 
 :::{note}

docs/source/deployment/integrations/production-stack.md

@@ -16,7 +16,7 @@ Ensure that you have a running Kubernetes environment with GPU (you can follow [
 
 ## Deployment using vLLM production stack
 
-The standard vLLM production stack install uses a Helm chart. You can run this [bash script](https://github.com/vllm-project/production-stack/blob/main/tutorials/install-helm.sh) to install Helm on your GPU server.
+The standard vLLM production stack is installed using a Helm chart. You can run this [bash script](https://github.com/vllm-project/production-stack/blob/main/utils/install-helm.sh) to install Helm on your GPU server.
 
 To install the vLLM production stack, run the following commands on your desktop:
 

docs/source/models/supported_models.md

@@ -788,7 +788,7 @@ llm = LLM(
 Online serving:
 
 ```bash
-vllm serve Qwen/Qwen2-VL-7B-Instruct --limit-mm-per-prompt image=4
+vllm serve Qwen/Qwen2-VL-7B-Instruct --limit-mm-per-prompt '{"image":4}'
 ```
 
 **This is no longer required if you are using vLLM V1.**

docs/source/serving/multimodal_inputs.md

@@ -228,7 +228,7 @@ First, launch the OpenAI-compatible server:
 
 ```bash
 vllm serve microsoft/Phi-3.5-vision-instruct --task generate \
-  --trust-remote-code --max-model-len 4096 --limit-mm-per-prompt image=2
+  --trust-remote-code --max-model-len 4096 --limit-mm-per-prompt '{"image":2}'
 ```
 
 Then, you can use the OpenAI client as follows:

examples/offline_inference/cpu_offload_lmcache.py

@@ -37,11 +37,11 @@ def build_llm_with_lmcache():
         '{"kv_connector":"LMCacheConnector", "kv_role":"kv_both"}')
     # Set GPU memory utilization to 0.8 for an A40 GPU with 40GB
     # memory. Reduce the value if your GPU has less memory.
-    # Note that LMCache is not compatible with chunked prefill for now.
+    # Note: LMCache supports chunked prefill (see vLLM#14505, LMCache#392).
     llm = LLM(model="mistralai/Mistral-7B-Instruct-v0.2",
               kv_transfer_config=ktc,
               max_model_len=8000,
-              enable_chunked_prefill=False,
+              enable_chunked_prefill=True,
               gpu_memory_utilization=0.8)
 
     try:

examples/offline_inference/mistral-small.py

@@ -16,11 +16,11 @@ from vllm.sampling_params import SamplingParams
 # # Mistral format
 # vllm serve mistralai/Mistral-Small-3.1-24B-Instruct-2503 \
 #   --tokenizer-mode mistral --config-format mistral --load-format mistral \
-#   --limit-mm-per-prompt 'image=4' --max-model-len 16384
+#   --limit-mm-per-prompt '{"image":4}' --max-model-len 16384
 #
 # # HF format
 # vllm serve mistralai/Mistral-Small-3.1-24B-Instruct-2503 \
-#   --limit-mm-per-prompt 'image=4' --max-model-len 16384
+#   --limit-mm-per-prompt '{"image":4}' --max-model-len 16384
 # ```
 #
 # - Client:

examples/online_serving/openai_chat_completion_client_for_multimodal.py

@@ -9,7 +9,7 @@ vllm serve llava-hf/llava-1.5-7b-hf --chat-template template_llava.jinja
 
 (multi-image inference with Phi-3.5-vision-instruct)
 vllm serve microsoft/Phi-3.5-vision-instruct --task generate \
-    --trust-remote-code --max-model-len 4096 --limit-mm-per-prompt image=2
+    --trust-remote-code --max-model-len 4096 --limit-mm-per-prompt '{"image":2}'
 
 (audio inference with Ultravox)
 vllm serve fixie-ai/ultravox-v0_5-llama-3_2-1b --max-model-len 4096

tests/engine/test_arg_utils.py

@@ -24,6 +24,10 @@ from vllm.utils import FlexibleArgumentParser
     }),
 ])
 def test_limit_mm_per_prompt_parser(arg, expected):
+    """This functionality is deprecated and will be removed in the future.
+    This argument should be passed as JSON string instead.
+    
+    TODO: Remove with nullable_kvs."""
     parser = EngineArgs.add_cli_args(FlexibleArgumentParser())
     if arg is None:
         args = parser.parse_args([])

tests/entrypoints/openai/test_audio.py

@@ -27,7 +27,7 @@ def server():
         "--enforce-eager",
         "--trust-remote-code",
         "--limit-mm-per-prompt",
-        f"audio={MAXIMUM_AUDIOS}",
+        str({"audio": MAXIMUM_AUDIOS}),
     ]
 
     with RemoteOpenAIServer(MODEL_NAME, args) as remote_server:

tests/entrypoints/openai/test_video.py

@@ -31,7 +31,7 @@ def server():
         "--enforce-eager",
         "--trust-remote-code",
         "--limit-mm-per-prompt",
-        f"video={MAXIMUM_VIDEOS}",
+        str({"video": MAXIMUM_VIDEOS}),
     ]
 
     with RemoteOpenAIServer(MODEL_NAME, args) as remote_server:

tests/entrypoints/openai/test_vision.py

@@ -35,7 +35,7 @@ def server():
         "--enforce-eager",
         "--trust-remote-code",
         "--limit-mm-per-prompt",
-        f"image={MAXIMUM_IMAGES}",
+        str({"image": MAXIMUM_IMAGES}),
     ]
 
     with RemoteOpenAIServer(MODEL_NAME, args) as remote_server:

tests/entrypoints/openai/test_vision_embedding.py

@@ -37,7 +37,7 @@ def server():
         "--enforce-eager",
         "--trust-remote-code",
         "--limit-mm-per-prompt",
-        f"image={MAXIMUM_IMAGES}",
+        str({"image": MAXIMUM_IMAGES}),
         "--chat-template",
         str(vlm2vec_jinja_path),
     ]

tests/models/decoder_only/audio_language/test_ultravox.py

@@ -48,9 +48,9 @@ def audio(request):
 ])
 def server(request, audio_assets):
     args = [
-        "--dtype=bfloat16", "--max-model-len=4096", "--enforce-eager",
-        f"--limit-mm-per-prompt=audio={len(audio_assets)}",
-        "--trust-remote-code"
+        "--dtype", "bfloat16", "--max-model-len", "4096", "--enforce-eager",
+        "--limit-mm-per-prompt",
+        str({"audio": len(audio_assets)}), "--trust-remote-code"
     ] + [
         f"--{key.replace('_','-')}={value}"
         for key, value in request.param.items()

vllm/attention/backends/rocm_flash_attn.py

@@ -27,6 +27,7 @@ _PARTITION_SIZE_ROCM = 256
 
 
 class ROCmFlashAttentionBackend(AttentionBackend):
+    accept_output_buffer: bool = True
 
     @staticmethod
     def get_name() -> str:
@@ -515,7 +516,7 @@ class ROCmFlashAttentionImpl(AttentionImpl):
 
             from vllm.attention.ops.triton_flash_attention import (  # noqa: F401
                 triton_attention)
-            self.attn_func = triton_attention
+            self.triton_attn_func = triton_attention
             logger.debug("Using Triton FA in ROCmBackend")
             if self.sliding_window != (-1, -1):
                 logger.warning("ROCm Triton FA does not currently support "
@@ -531,7 +532,7 @@ class ROCmFlashAttentionImpl(AttentionImpl):
             else:
                 try:
                     from flash_attn import flash_attn_varlen_func  # noqa: F401
-                    self.attn_func = flash_attn_varlen_func
+                    self.fa_attn_func = flash_attn_varlen_func
                     logger.debug("Using CK FA in ROCmBackend")
                 except ModuleNotFoundError:
                     self.use_naive_attn = True
@@ -542,7 +543,7 @@ class ROCmFlashAttentionImpl(AttentionImpl):
                         "ROCm Naive FlashAttention does not support "
                         "attention logits soft capping.")
 
-                self.attn_func = _sdpa_attention
+                self.sdpa_attn_func = _sdpa_attention
                 logger.debug("Using naive (SDPA) attention in ROCmBackend")
 
     def repeat_kv(self, x: torch.Tensor, n_rep: int) -> torch.Tensor:
@@ -613,6 +614,8 @@ class ROCmFlashAttentionImpl(AttentionImpl):
         Returns:
             shape = [num_tokens, num_heads * head_size]
         """
+        assert output is not None, "Output tensor must be provided."
+
         query = query.view(-1, self.num_heads, self.head_size)
         if key is not None:
             assert value is not None
@@ -656,7 +659,6 @@ class ROCmFlashAttentionImpl(AttentionImpl):
             assert attn_metadata.num_encoder_tokens is not None
             num_prefill_tokens = attn_metadata.num_encoder_tokens
 
-        output = torch.empty_like(query)
         # Query for decode. KV is not needed because it is already cached.
         decode_query = query[num_prefill_tokens:]
         # QKV for prefill.
@@ -704,11 +706,11 @@ class ROCmFlashAttentionImpl(AttentionImpl):
                             query.dtype,
                             seq_lens,
                             make_attn_mask=causal_mask)  # type: ignore
-                    out, _ = self.attn_func(
+                    self.triton_attn_func(
                         query,
                         key,
                         value,
-                        None,
+                        output[:num_prefill_tokens],
                         query_seq_start_loc,
                         key_seq_start_loc,
                         query_max_seq_len,
@@ -733,10 +735,11 @@ class ROCmFlashAttentionImpl(AttentionImpl):
                     key = key.movedim(0, key.dim() - 2)
                     value = value.movedim(0, value.dim() - 2)
                     # sdpa math backend attention
-                    out = self.attn_func(
+                    self.sdpa_attn_func(
                         query,
                         key,
                         value,
+                        output[:num_prefill_tokens],
                         query_seq_start_loc,
                         num_prefill_tokens,
                         self.num_heads,
@@ -745,7 +748,8 @@ class ROCmFlashAttentionImpl(AttentionImpl):
                         attn_masks,
                     )
                 else:
-                    out = self.attn_func(
+                    # upstream FA does not support an output arg, copy
+                    output[:num_prefill_tokens] = self.fa_attn_func(
                         q=query,
                         k=key,
                         v=value,
@@ -760,12 +764,6 @@ class ROCmFlashAttentionImpl(AttentionImpl):
                         softcap=self.logits_soft_cap,
                     )
 
-                # common code for prefill
-                assert output[:num_prefill_tokens].shape == out.shape
-                if output.shape[0] > num_prefill_tokens:
-                    output[:num_prefill_tokens] = out
-                else:
-                    output = out
             else:
                 # prefix-enabled attention -
                 # not applicable for encoder-only models
@@ -818,14 +816,10 @@ class ROCmFlashAttentionImpl(AttentionImpl):
                     device=output.device,
                 )
                 max_logits = torch.empty_like(exp_sums)
-                if num_prefill_tokens > 0:
-                    out = output[num_prefill_tokens:]
-                else:
-                    out = output
 
                 query_start_loc = None
                 ops.paged_attention_rocm(
-                    out,
+                    output[num_prefill_tokens:],
                     exp_sums,
                     max_logits,
                     tmp_output,
@@ -878,7 +872,8 @@ def _sdpa_attention(
     query: torch.Tensor,
     key: torch.Tensor,
     value: torch.Tensor,
-    seq_lens: List[int],
+    output: torch.Tensor,
+    seq_lens: torch.Tensor,
     num_tokens: int,
     num_heads: int,
     head_size: int,
@@ -886,9 +881,9 @@ def _sdpa_attention(
     attn_masks: Optional[List[torch.Tensor]] = None,
 ) -> torch.Tensor:
     start = 0
-    output = torch.empty((num_tokens, num_heads, head_size),
-                         dtype=query.dtype,
-                         device=query.device)
+    assert output.shape == (num_tokens, num_heads, head_size)
+    assert output.dtype == query.dtype
+    assert output.device == query.device
 
     for i, seq_len in enumerate(seq_lens):
         end = start + seq_len

vllm/collect_env.py

@@ -289,6 +289,7 @@ def get_vllm_version():
 
     return __version__
 
+
 def summarize_vllm_build_flags():
     # This could be a static method if the flags are constant, or dynamic if you need to check environment variables, etc.
     return 'CUDA Archs: {}; ROCm: {}; Neuron: {}'.format(
@@ -502,7 +503,9 @@ def get_pip_packages(run_lambda, patterns=None):
             print("uv is set")
             cmd = ["uv", "pip", "list", "--format=freeze"]
         else:
-            raise RuntimeError("Could not collect pip list output (pip or uv module not available)")
+            raise RuntimeError(
+                "Could not collect pip list output (pip or uv module not available)"
+            )
 
         out = run_and_read_all(run_lambda, cmd)
         return "\n".join(line for line in out.splitlines()
@@ -535,13 +538,12 @@ def is_xnnpack_available():
     else:
         return "N/A"
 
+
 def get_env_vars():
     env_vars = ''
     secret_terms = ('secret', 'token', 'api', 'access', 'password')
-    report_prefix = ("TORCH", "NCCL", "PYTORCH",
-                     "CUDA", "CUBLAS", "CUDNN",
-                     "OMP_", "MKL_",
-                     "NVIDIA")
+    report_prefix = ("TORCH", "NCCL", "PYTORCH", "CUDA", "CUBLAS", "CUDNN",
+                     "OMP_", "MKL_", "NVIDIA")
     for k, v in os.environ.items():
         if any(term in k.lower() for term in secret_terms):
             continue
@@ -552,6 +554,7 @@ def get_env_vars():
 
     return env_vars
 
+
 def get_env_info():
     run_lambda = run
     pip_version, pip_list_output = get_pip_packages(run_lambda)

vllm/config.py

@@ -17,7 +17,7 @@ from dataclasses import (MISSING, dataclass, field, fields, is_dataclass,
 from importlib.util import find_spec
 from pathlib import Path
 from typing import (TYPE_CHECKING, Any, Callable, ClassVar, Final, Literal,
-                    Optional, Protocol, TypeVar, Union)
+                    Optional, Protocol, TypeVar, Union, get_args)
 
 import torch
 from pydantic import BaseModel, Field, PrivateAttr
@@ -2725,6 +2725,7 @@ class PromptAdapterConfig:
                                                 self.prompt_adapter_dtype)
 
 
+@config
 @dataclass
 class MultiModalConfig:
     """Controls the behavior of multimodal models."""
@@ -2732,6 +2733,8 @@ class MultiModalConfig:
     limit_per_prompt: Mapping[str, int] = field(default_factory=dict)
     """
     The maximum number of input items allowed per prompt for each modality.
+    This should be a JSON string that will be parsed into a dictionary.
+    Defaults to 1 (V0) or 999 (V1) for each modality.
     """
 
     def compute_hash(self) -> str:
@@ -2753,24 +2756,20 @@ class MultiModalConfig:
                                usedforsecurity=False).hexdigest()
         return hash_str
 
-    def get_default_limit_per_prompt(self) -> int:
-        """
-        Return the default number of input items allowed per prompt
-        for any modality if not specified by the user.
-        """
-        return 999 if envs.VLLM_USE_V1 else 1
-
     def get_limit_per_prompt(self, modality: str) -> int:
         """
         Get the maximum number of input items allowed per prompt
         for the given modality.
         """
-        default = self.get_default_limit_per_prompt()
-        return self.limit_per_prompt.get(modality, default)
+        return self.limit_per_prompt.get(
+            modality,
+            999 if envs.VLLM_USE_V1 else 1,
+        )
 
     # TODO: Add configs to init vision tower or not.
 
 
+@config
 @dataclass
 class PoolerConfig:
     """Controls the behavior of output pooling in pooling models."""
@@ -3095,15 +3094,28 @@ def get_served_model_name(model: str,
     return served_model_name
 
 
+GuidedDecodingBackendV0 = Literal["auto", "outlines", "lm-format-enforcer",
+                                  "xgrammar"]
+GuidedDecodingBackendV1 = Literal["auto", "xgrammar", "guidance"]
+
+
+@config
 @dataclass
 class DecodingConfig:
-    """Dataclass which contains the decoding strategy of the engine"""
+    """Dataclass which contains the decoding strategy of the engine."""
 
-    # Which guided decoding algo to use.
-    # 'outlines' / 'lm-format-enforcer' / 'xgrammar'
-    guided_decoding_backend: str = "auto" if envs.VLLM_USE_V1 else "xgrammar"
+    guided_decoding_backend: Union[
+        GuidedDecodingBackendV0,
+        GuidedDecodingBackendV1] = "auto" if envs.VLLM_USE_V1 else "xgrammar"
+    """Which engine will be used for guided decoding (JSON schema / regex etc)
+    by default. With "auto", we will make opinionated choices based on request
+    contents and what the backend libraries currently support, so the behavior
+    is subject to change in each release."""
 
     reasoning_backend: Optional[str] = None
+    """Select the reasoning parser depending on the model that you're using.
+    This is used to parse the reasoning content into OpenAI API format.
+    Required for `--enable-reasoning`."""
 
     def compute_hash(self) -> str:
         """
@@ -3125,17 +3137,12 @@ class DecodingConfig:
         return hash_str
 
     def __post_init__(self):
-        v0_valid_guided_backends = [
-            'outlines', 'lm-format-enforcer', 'xgrammar', 'auto'
-        ]
-        v1_valid_guided_backends = ['xgrammar', 'guidance', 'auto']
-
         backend = GuidedDecodingParams(
             backend=self.guided_decoding_backend).backend_name
         if envs.VLLM_USE_V1:
-            valid_guided_backends = v1_valid_guided_backends
+            valid_guided_backends = get_args(GuidedDecodingBackendV1)
         else:
-            valid_guided_backends = v0_valid_guided_backends
+            valid_guided_backends = get_args(GuidedDecodingBackendV0)
         if backend not in valid_guided_backends:
             raise ValueError(f"Invalid guided_decoding_backend '{backend}',"
                              f" must be one of {valid_guided_backends}")

vllm/engine/arg_utils.py

@@ -20,11 +20,12 @@ from vllm.config import (CacheConfig, CompilationConfig, Config, ConfigFormat,
                          DecodingConfig, Device, DeviceConfig,
                          DistributedExecutorBackend, HfOverrides,
                          KVTransferConfig, LoadConfig, LoadFormat, LoRAConfig,
-                         ModelConfig, ModelImpl, ObservabilityConfig,
-                         ParallelConfig, PoolerConfig, PoolType,
-                         PromptAdapterConfig, SchedulerConfig, SchedulerPolicy,
-                         SpeculativeConfig, TaskOption, TokenizerPoolConfig,
-                         VllmConfig, get_attr_docs, get_field)
+                         ModelConfig, ModelImpl, MultiModalConfig,
+                         ObservabilityConfig, ParallelConfig, PoolerConfig,
+                         PoolType, PromptAdapterConfig, SchedulerConfig,
+                         SchedulerPolicy, SpeculativeConfig, TaskOption,
+                         TokenizerPoolConfig, VllmConfig, get_attr_docs,
+                         get_field)
 from vllm.executor.executor_base import ExecutorBase
 from vllm.logger import init_logger
 from vllm.model_executor.layers.quantization import QUANTIZATION_METHODS
@@ -190,7 +191,8 @@ class EngineArgs:
         TokenizerPoolConfig.pool_type
     tokenizer_pool_extra_config: dict[str, Any] = \
         get_field(TokenizerPoolConfig, "extra_config")
-    limit_mm_per_prompt: Optional[Mapping[str, int]] = None
+    limit_mm_per_prompt: Mapping[str, int] = \
+        get_field(MultiModalConfig, "limit_per_prompt")
     mm_processor_kwargs: Optional[Dict[str, Any]] = None
     disable_mm_preprocessor_cache: bool = False
     enable_lora: bool = False
@@ -252,7 +254,7 @@ class EngineArgs:
 
     additional_config: Optional[Dict[str, Any]] = None
     enable_reasoning: Optional[bool] = None
-    reasoning_parser: Optional[str] = None
+    reasoning_parser: Optional[str] = DecodingConfig.reasoning_backend
     use_tqdm_on_load: bool = LoadConfig.use_tqdm_on_load
 
     def __post_init__(self):
@@ -478,18 +480,22 @@ class EngineArgs:
                             'Examples:\n'
                             '- 1k → 1000\n'
                             '- 1K → 1024\n')
-        parser.add_argument(
+
+        # Guided decoding arguments
+        guided_decoding_kwargs = get_kwargs(DecodingConfig)
+        guided_decoding_group = parser.add_argument_group(
+            title="DecodingConfig",
+            description=DecodingConfig.__doc__,
+        )
+        guided_decoding_group.add_argument(
             '--guided-decoding-backend',
-            type=str,
-            default=DecodingConfig.guided_decoding_backend,
-            help='Which engine will be used for guided decoding'
-            ' (JSON schema / regex etc) by default. Currently support '
-            'https://github.com/mlc-ai/xgrammar and '
-            'https://github.com/guidance-ai/llguidance.'
-            'Valid backend values are "xgrammar", "guidance", and "auto". '
-            'With "auto", we will make opinionated choices based on request '
-            'contents and what the backend libraries currently support, so '
-            'the behavior is subject to change in each release.')
+            **guided_decoding_kwargs["guided_decoding_backend"])
+        guided_decoding_group.add_argument(
+            "--reasoning-parser",
+            # This choices is a special case because it's not static
+            choices=list(ReasoningParserManager.reasoning_parsers),
+            **guided_decoding_kwargs["reasoning_backend"])
+
         parser.add_argument(
             '--logits-processor-pattern',
             type=optional_str,
@@ -697,18 +703,14 @@ class EngineArgs:
                                      **tokenizer_kwargs["extra_config"])
 
         # Multimodal related configs
-        parser.add_argument(
-            '--limit-mm-per-prompt',
-            type=nullable_kvs,
-            default=EngineArgs.limit_mm_per_prompt,
-            # The default value is given in
-            # MultiModalConfig.get_default_limit_per_prompt
-            help=('For each multimodal plugin, limit how many '
-                  'input instances to allow for each prompt. '
-                  'Expects a comma-separated list of items, '
-                  'e.g.: `image=16,video=2` allows a maximum of 16 '
-                  'images and 2 videos per prompt. Defaults to '
-                  '1 (V0) or 999 (V1) for each modality.'))
+        multimodal_kwargs = get_kwargs(MultiModalConfig)
+        multimodal_group = parser.add_argument_group(
+            title="MultiModalConfig",
+            description=MultiModalConfig.__doc__,
+        )
+        multimodal_group.add_argument('--limit-mm-per-prompt',
+                                      **multimodal_kwargs["limit_per_prompt"])
+
         parser.add_argument(
             '--mm-processor-kwargs',
             default=None,
@@ -1018,16 +1020,6 @@ class EngineArgs:
             "If enabled, the model will be able to generate reasoning content."
         )
 
-        parser.add_argument(
-            "--reasoning-parser",
-            type=str,
-            choices=list(ReasoningParserManager.reasoning_parsers),
-            default=None,
-            help=
-            "Select the reasoning parser depending on the model that you're "
-            "using. This is used to parse the reasoning content into OpenAI "
-            "API format. Required for ``--enable-reasoning``.")
-
         parser.add_argument(
             "--disable-cascade-attn",
             action="store_true",

vllm/entrypoints/cli/collect_env.py

@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: Apache-2.0
+
+import argparse
+
+from vllm.collect_env import main as collect_env_main
+from vllm.entrypoints.cli.types import CLISubcommand
+from vllm.entrypoints.openai.cli_args import make_arg_parser
+from vllm.utils import FlexibleArgumentParser
+
+
+class CollectEnvSubcommand(CLISubcommand):
+    """The `serve` subcommand for the vLLM CLI. """
+
+    def __init__(self):
+        self.name = "collect-env"
+        super().__init__()
+
+    @staticmethod
+    def cmd(args: argparse.Namespace) -> None:
+        """Collect information about the environment."""
+        collect_env_main()
+
+    def subparser_init(
+            self,
+            subparsers: argparse._SubParsersAction) -> FlexibleArgumentParser:
+        serve_parser = subparsers.add_parser(
+            "collect-env",
+            help="Start collecting environment information.",
+            description="Start collecting environment information.",
+            usage="vllm collect-env")
+        return make_arg_parser(serve_parser)
+
+
+def cmd_init() -> list[CLISubcommand]:
+    return [CollectEnvSubcommand()]

vllm/entrypoints/cli/main.py

@@ -5,6 +5,7 @@ import signal
 import sys
 
 import vllm.entrypoints.cli.benchmark.main
+import vllm.entrypoints.cli.collect_env
 import vllm.entrypoints.cli.openai
 import vllm.entrypoints.cli.serve
 import vllm.version
@@ -15,6 +16,7 @@ CMD_MODULES = [
     vllm.entrypoints.cli.openai,
     vllm.entrypoints.cli.serve,
     vllm.entrypoints.cli.benchmark.main,
+    vllm.entrypoints.cli.collect_env,
 ]
 
 

vllm/model_executor/layers/fused_moe/layer.py

@@ -422,6 +422,7 @@ class FusedMoE(torch.nn.Module):
 
         if params_dtype is None:
             params_dtype = torch.get_default_dtype()
+        self.params_dtype = params_dtype
 
         # Note: here we guard against accessing the TP and DP groups when
         # uninitialized (this happens when testing)

vllm/model_executor/models/llama4.py

@@ -51,8 +51,8 @@ class Llama4MoE(nn.Module):
         renormalize: bool,
     ) -> Tuple[torch.Tensor, torch.Tensor]:
         router_scores, router_indices = fast_topk(gating_output, topk, dim=-1)
-        router_scores = torch.sigmoid(router_scores.float()).to(
-            hidden_states.dtype)
+        # psuedo-standard is that the router scores are floats
+        router_scores = torch.sigmoid(router_scores.float())
         return (router_scores, router_indices.to(torch.int32))
 
     def __init__(self,

vllm/model_executor/models/mllama4.py

@@ -672,9 +672,9 @@ class Llama4ForConditionalGeneration(nn.Module, SupportsMultiModal,
             self.config,
             None,
             prefix=maybe_prefix(prefix, "multi_modal_projector"))
-
         self.language_model = _initialize_model(
-            vllm_config=vllm_config.with_hf_config(config.text_config),
+            vllm_config=vllm_config.with_hf_config(config.text_config,
+                                                   ["LlamaForCausalLM"]),
             prefix=maybe_prefix(prefix, "language_model"),
             model_class=Llama4ForCausalLM,
         )
@@ -824,7 +824,7 @@ class Llama4ForConditionalGeneration(nn.Module, SupportsMultiModal,
         # language_model is an Llama4ForCausalLM instance. We load it's
         # using llama4's load_weights routine.
         language_model_weights, other_weights = self.separate_weights(
-            weights, prefix="language_model.model.")
+            weights, prefix="language_model.")
         loader = AutoWeightsLoader(self)
         loaded_language_model_params = loader.load_weights(
             language_model_weights)

vllm/multimodal/processing.py

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
+import json
 import re
 import sys
 from abc import ABC, abstractmethod
@@ -1117,8 +1118,9 @@ class BaseMultiModalProcessor(ABC, Generic[_I]):
 
             if num_items > allowed_limit:
                 raise ValueError(
-                    f"You set or defaulted to {modality}={allowed_limit} "
-                    f"in --limit-mm-per-prompt`, but passed {num_items} "
+                    "You set or defaulted to "
+                    f"'{json.dumps({modality: allowed_limit})}' in "
+                    f"`--limit-mm-per-prompt`, but passed {num_items} "
                     f"{modality} items in the same prompt.")
 
         return mm_items

vllm/multimodal/registry.py

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 import functools
+import json
 from collections import UserDict
 from collections.abc import Mapping, Sequence
 from dataclasses import dataclass
@@ -194,9 +195,9 @@ class MultiModalRegistry:
             max_items = self._limits_by_model[model_config][data_key]
             if num_items > max_items:
                 raise ValueError(
-                    f"You set {data_key}={max_items} (or defaulted to 1) in "
-                    f"`--limit-mm-per-prompt`, but found {num_items} items "
-                    "in the same prompt.")
+                    f"You set '{json.dumps({data_key: max_items})}' (or "
+                    "defaulted to 1) in `--limit-mm-per-prompt`, but found "
+                    f"{num_items} items in the same prompt.")
 
             input_dict = plugin.map_input(model_config, data_value,
                                           mm_processor_kwargs)

vllm/v1/engine/processor.py

@@ -149,6 +149,7 @@ class Processor:
             "xgrammar", "xgrammar:disable-any-whitespace", "guidance",
             "guidance:disable-any-whitespace", "auto"
         ]
+
         engine_level_backend = self.decoding_config.guided_decoding_backend
         if engine_level_backend not in supported_backends:
             raise ValueError(f"Only {supported_backends} structured output is "
@@ -169,8 +170,15 @@ class Processor:
         if engine_level_backend.startswith("xgrammar"):
             # xgrammar with no fallback
             validate_xgrammar_grammar(params)
-            params.guided_decoding.backend = engine_level_backend
-        elif engine_level_backend == "auto":
+        elif engine_level_backend.startswith("guidance"):
+            # TODO: ideally we would have the LLTokenizer here as Lark syntax
+            # allows <|special_token|> and similar, see
+            # https://github.com/guidance-ai/llguidance/blob/main/docs/syntax.md#special-tokens
+            # Without tokenizer these are disallowed in grammars.
+            validate_guidance_grammar(params, tokenizer=None)
+        else:
+            # NOTE: engine_level_backend must be "auto" here, because we have
+            # checked supported_backends above.
             # "auto" is an opt-in to opinionated behavior where we try to
             # choose a backend based on request contents. This is not the
             # default as it is less predictable and subject to change
@@ -183,14 +191,6 @@ class Processor:
                 # are not supported in xgrammar. Fall back to guidance.
                 params.guided_decoding.backend = "guidance"
 
-        if engine_level_backend.startswith("guidance"):
-            # TODO ideally we would have the LLTokenizer here as Lark syntax
-            # allows <|special_token|> and similar, see
-            # https://github.com/guidance-ai/llguidance/blob/main/docs/syntax.md#special-tokens
-            # Without tokenizer these are disallowed in grammars.
-            validate_guidance_grammar(params, tokenizer=None)
-            params.guided_decoding.backend = engine_level_backend
-
     def process_inputs(
         self,
         request_id: str,