[Models] Qwen3-ASR (#33312)

Signed-off-by: Roger Wang <hey@rogerw.io>

docs/models/supported_models.md

@@ -720,6 +720,7 @@ These models primarily accept the [`LLM.generate`](./generative_models.md#llmgen
 | `Qwen3VLForConditionalGeneration` | Qwen3-VL | T + I<sup>E+</sup> + V<sup>E+</sup> | `Qwen/Qwen3-VL-4B-Instruct`, etc. | ✅︎ | ✅︎ |
 | `Qwen3VLMoeForConditionalGeneration` | Qwen3-VL-MOE | T + I<sup>E+</sup> + V<sup>E+</sup> | `Qwen/Qwen3-VL-30B-A3B-Instruct`, etc. | ✅︎ | ✅︎ |
 | `Qwen3OmniMoeThinkerForConditionalGeneration` | Qwen3-Omni | T + I<sup>E+</sup> + V<sup>E+</sup> + A<sup>+</sup> | `Qwen/Qwen3-Omni-30B-A3B-Instruct`, `Qwen/Qwen3-Omni-30B-A3B-Thinking` | ✅︎ | ✅︎ |
+| `Qwen3ASRForConditionalGeneration` | Qwen3-ASR | T + A<sup>+</sup> | `Qwen/Qwen3-ASR-1.7B` | ✅︎ | ✅︎ |
 | `RForConditionalGeneration` | R-VL-4B | T + I<sup>E+</sup> | `YannQi/R-4B` | | ✅︎ |
 | `SkyworkR1VChatModel` | Skywork-R1V-38B | T + I | `Skywork/Skywork-R1V-38B` | | ✅︎ |
 | `SmolVLMForConditionalGeneration` | SmolVLM2 | T + I | `SmolVLM2-2.2B-Instruct` | ✅︎ | |
@@ -769,6 +770,7 @@ Speech2Text models trained specifically for Automatic Speech Recognition.
 | `Gemma3nForConditionalGeneration` | Gemma3n | `google/gemma-3n-E2B-it`, `google/gemma-3n-E4B-it`, etc. | | |
 | `GlmAsrForConditionalGeneration` | GLM-ASR | `zai-org/GLM-ASR-Nano-2512` | ✅︎ | ✅︎ |
 | `GraniteSpeechForConditionalGeneration` | Granite Speech | `ibm-granite/granite-speech-3.3-2b`, `ibm-granite/granite-speech-3.3-8b`, etc. | ✅︎ | ✅︎ |
+| `Qwen3ASRForConditionalGeneration` | Qwen3-ASR | `Qwen/Qwen3-ASR-1.7B`, etc. | | ✅︎ |
 | `VoxtralForConditionalGeneration` | Voxtral (Mistral format) | `mistralai/Voxtral-Mini-3B-2507`, `mistralai/Voxtral-Small-24B-2507`, etc. | ✅︎ | ✅︎ |
 | `WhisperForConditionalGeneration` | Whisper | `openai/whisper-small`, `openai/whisper-large-v3-turbo`, etc. | | |
 

examples/offline_inference/audio_language.py

@@ -330,6 +330,25 @@ def run_qwen2_5_omni(question: str, audio_count: int):
     )
 
 
+def run_qwen3_asr(question: str, audio_count: int) -> ModelRequestData:
+    model_name = "Qwen/Qwen3-Asr-1.7B"
+
+    audio_in_prompt = "<|audio_start|><|audio_pad|><|audio_end|>\n" * audio_count
+    prompt = f"<|im_start|>user\n{audio_in_prompt}<|im_end|>\n<|im_start|>assistant\n"
+
+    engine_args = EngineArgs(
+        model=model_name,
+        max_model_len=4096,
+        max_num_seqs=5,
+        limit_mm_per_prompt={"audio": audio_count},
+    )
+
+    return ModelRequestData(
+        engine_args=engine_args,
+        prompt=prompt,
+    )
+
+
 # Ultravox 0.5-1B
 def run_ultravox(question: str, audio_count: int) -> ModelRequestData:
     model_name = "fixie-ai/ultravox-v0_5-llama-3_2-1b"
@@ -442,6 +461,7 @@ model_example_map = {
     "phi4_mm": run_phi4mm,
     "qwen2_audio": run_qwen2_audio,
     "qwen2_5_omni": run_qwen2_5_omni,
+    "qwen3_asr": run_qwen3_asr,
     "ultravox": run_ultravox,
     "voxtral": run_voxtral,
     "whisper": run_whisper,

tests/models/registry.py

@@ -944,6 +944,12 @@ _MULTIMODAL_EXAMPLE_MODELS = {
         max_model_len=4096,
         min_transformers_version="4.57",
     ),
+    "Qwen3ASRForConditionalGeneration": _HfExamplesInfo(
+        "Qwen/Qwen3-ASR-1.7B",
+        max_model_len=4096,
+        min_transformers_version="4.57",
+        is_available_online=False,
+    ),
     "RForConditionalGeneration": _HfExamplesInfo("YannQi/R-4B", trust_remote_code=True),
     "SkyworkR1VChatModel": _HfExamplesInfo(
         "Skywork/Skywork-R1V-38B", trust_remote_code=True

vllm/model_executor/models/registry.py

@@ -436,6 +436,10 @@ _MULTIMODAL_MODELS = {
         "qwen3_omni_moe_thinker",
         "Qwen3OmniMoeThinkerForConditionalGeneration",
     ),
+    "Qwen3ASRForConditionalGeneration": (
+        "qwen3_asr",
+        "Qwen3ASRForConditionalGeneration",
+    ),
     "Qwen3VLForConditionalGeneration": ("qwen3_vl", "Qwen3VLForConditionalGeneration"),  # noqa: E501
     "Qwen3VLMoeForConditionalGeneration": (
         "qwen3_vl_moe",

vllm/transformers_utils/config.py

@@ -97,6 +97,7 @@ _CONFIG_REGISTRY: dict[str, type[PretrainedConfig]] = LazyConfigDict(
     ultravox="UltravoxConfig",
     step3_vl="Step3VLConfig",
     step3_text="Step3TextConfig",
+    qwen3_asr="Qwen3ASRConfig",
     qwen3_next="Qwen3NextConfig",
     lfm2_moe="Lfm2MoeConfig",
     tarsier2="Tarsier2Config",

vllm/transformers_utils/configs/__init__.py

@@ -52,6 +52,7 @@ _CLASS_TO_MODULE: dict[str, str] = {
     "Step3VLConfig": "vllm.transformers_utils.configs.step3_vl",
     "Step3VisionEncoderConfig": "vllm.transformers_utils.configs.step3_vl",
     "Step3TextConfig": "vllm.transformers_utils.configs.step3_vl",
+    "Qwen3ASRConfig": "vllm.transformers_utils.configs.qwen3_asr",
     "Qwen3NextConfig": "vllm.transformers_utils.configs.qwen3_next",
     "Tarsier2Config": "vllm.transformers_utils.configs.tarsier2",
     # Special case: DeepseekV3Config is from HuggingFace Transformers
@@ -94,6 +95,7 @@ __all__ = [
     "Step3VLConfig",
     "Step3VisionEncoderConfig",
     "Step3TextConfig",
+    "Qwen3ASRConfig",
     "Qwen3NextConfig",
     "Tarsier2Config",
 ]

vllm/transformers_utils/processors/qwen3_asr.py

+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+# ruff: noqa
+# mypy: ignore-errors
+# coding=utf-8
+# Copyright 2026 The Qwen team, Alibaba Group and the HuggingFace Inc. team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import regex as re
+
+import numpy as np
+
+from transformers import AutoProcessor
+from transformers.audio_utils import AudioInput
+from transformers.feature_extraction_utils import BatchFeature
+from transformers.processing_utils import ProcessingKwargs, ProcessorMixin
+from transformers.tokenization_utils_base import TextInput
+
+
+class Qwen3ASRProcessorKwargs(ProcessingKwargs, total=False):
+    _defaults = {
+        "text_kwargs": {
+            "padding": False,
+            "padding_side": "left",
+        },
+        "audio_kwargs": {
+            "sampling_rate": 16000,
+            "padding": True,
+            "return_attention_mask": True,
+        },
+    }
+
+
+def _get_feat_extract_output_lengths(input_lengths):
+    """
+    Computes the output length of the convolutional layers and the output length of the audio encoder
+    """
+
+    input_lengths_leave = input_lengths % 100
+    feat_lengths = (input_lengths_leave - 1) // 2 + 1
+    output_lengths = (
+        ((feat_lengths - 1) // 2 + 1 - 1) // 2 + 1 + (input_lengths // 100) * 13
+    )
+    return output_lengths
+
+
+class Qwen3ASRProcessor(ProcessorMixin):
+    r"""
+    Constructs a Qwen3ASR processor.
+    [`Qwen3ASRProcessor`] offers all the functionalities of [`WhisperFeatureExtractor`], and [`Qwen2TokenizerFast`]. See the
+    [`~Qwen3ASRProcessor.__call__`] and [`~Qwen3ASRProcessor.decode`] for more information.
+
+    Args:
+        feature_extractor ([`WhisperFeatureExtractor`], *optional*):
+            The audio feature extractor.
+        tokenizer ([`Qwen2TokenizerFast`], *optional*):
+            The text tokenizer.
+        chat_template (`Optional[str]`, *optional*):
+            The Jinja template to use for formatting the conversation. If not provided, the default chat template is used.
+    """
+
+    attributes = ["feature_extractor", "tokenizer"]
+    feature_extractor_class = "WhisperFeatureExtractor"
+    tokenizer_class = ("Qwen2Tokenizer", "Qwen2TokenizerFast")
+
+    def __init__(self, feature_extractor=None, tokenizer=None, chat_template=None):
+        super().__init__(feature_extractor, tokenizer, chat_template=chat_template)
+        self.audio_token = self.tokenizer.audio_token
+        self.audio_bos_token = self.tokenizer.audio_bos_token
+        self.audio_eos_token = self.tokenizer.audio_eos_token
+
+    def __call__(
+        self,
+        text: TextInput = None,
+        audio: AudioInput = None,
+        **kwargs,
+    ) -> BatchFeature:
+        """
+        Main method to prepare for the model one or several sequences(s) and audio(s). This method forwards the `text`
+        and `kwargs` arguments to Qwen2TokenizerFast's [`~Qwen2TokenizerFast.__call__`] if `text` is not `None` to encode
+        the text. To prepare the audio(s), this method forwards the `audio` and `kwargs` arguments to
+        WhisperFeatureExtractor's [`~WhisperFeatureExtractor.__call__`] if `audio` is not `None`. Please refer to the doctsring
+        of the above two methods for more information.
+
+        Args:
+            text (`str`, `List[str]`, `List[List[str]]`):
+                The sequence or batch of sequences to be encoded. Each sequence can be a string or a list of strings
+                (pretokenized string). If the sequences are provided as list of strings (pretokenized), you must set
+                `is_split_into_words=True` (to lift the ambiguity with a batch of sequences).
+            audio (`np.ndarray`, `List[np.ndarray]`):
+                The audio or batch of audio to be prepared. Each audio can be a NumPy array.
+        """
+
+        if text is None:
+            raise ValueError("You need to specify either a `text` input to process.")
+
+        output_kwargs = self._merge_kwargs(
+            Qwen3ASRProcessorKwargs,
+            tokenizer_init_kwargs=self.tokenizer.init_kwargs,
+            **kwargs,
+        )
+
+        if audio is not None:
+            output_kwargs["audio_kwargs"]["padding"] = True
+            output_kwargs["audio_kwargs"]["truncation"] = False
+            audio_inputs = self.feature_extractor(
+                audio, **output_kwargs["audio_kwargs"]
+            )
+            audio_inputs["feature_attention_mask"] = audio_inputs.pop(
+                "attention_mask"
+            )  # rename feature_attention_mask to prevent conflicts later on
+            audio_inputs["input_features"] = audio_inputs.pop(
+                "input_features"
+            )  # rename input_features to prevent conflicts later on
+            audio_lengths = iter(
+                _get_feat_extract_output_lengths(
+                    audio_inputs["feature_attention_mask"].sum(-1)
+                )
+            )
+        else:
+            audio_inputs = {}
+            audio_lengths = iter([])
+
+        if not isinstance(text, list):
+            text = [text]
+
+        text = self.replace_multimodal_special_tokens(
+            text,
+            audio_lengths,
+        )
+
+        texts_inputs = self.tokenizer(text, **output_kwargs["text_kwargs"])
+
+        return BatchFeature(
+            data={**texts_inputs, **audio_inputs},
+            tensor_type=kwargs.get("return_tensors"),
+        )
+
+    def replace_multimodal_special_tokens(
+        self,
+        text,
+        audio_lengths,
+    ):
+        processed_text = []
+        for sample in text:
+            positions = []
+            special_tokens = [re.escape(tok) for tok in [self.audio_token]]
+            pattern = "|".join(special_tokens)
+            positions = sorted(
+                [
+                    (match.start(), match.group())
+                    for match in re.finditer(pattern, sample)
+                ]
+            )
+            positions.sort(key=lambda x: x[0])
+
+            for _, special_token in positions:
+                if special_token == self.audio_token:
+                    sample = sample.replace(
+                        self.audio_token,
+                        "<|audio_placeholder|>" * next(audio_lengths),
+                        1,
+                    )
+
+            sample = sample.replace("<|audio_placeholder|>", self.audio_token)
+            processed_text.append(sample)
+        return processed_text
+
+    def get_chunked_index(
+        self, token_indices: np.ndarray, tokens_per_chunk: int
+    ) -> list[tuple[int, int]]:
+        """
+        Splits token index list into chunks based on token value ranges.
+
+        Given a list of token indices, returns a list of (start, end) index tuples representing
+        slices of the list where the token values fall within successive ranges of `tokens_per_chunk`.
+
+        For example, if `tokens_per_chunk` is 1000, the function will create chunks such that:
+        - the first chunk contains token values < 1000,
+        - the second chunk contains values >= 1000 and < 2000, and so on.
+
+        Parameters:
+            token_indices (`np.ndarray`): A monotonically increasing list of token index values.
+            tokens_per_chunk (`int`): Number of tokens per chunk (used as the chunk size threshold).
+
+        Returns:
+            `list[tuple[int, int]]`: A list of tuples, each representing the start (inclusive)
+                                and end (exclusive) indices of a chunk in `token_indices`.
+        """
+
+        def _iter():
+            i, start_idx = 0, 0  # skip bos token
+            current_chunk = 1
+            while i < len(token_indices):  # skip eos token
+                if token_indices[i] >= current_chunk * tokens_per_chunk:
+                    yield (start_idx, i)
+                    start_idx = i
+                    current_chunk += 1
+                i += 1
+            yield (start_idx, len(token_indices))
+
+        return list(_iter())
+
+    def apply_chat_template(self, conversations, chat_template=None, **kwargs):
+        return super().apply_chat_template(conversations, chat_template, **kwargs)
+
+    @property
+    def model_input_names(self):
+        tokenizer_input_names = self.tokenizer.model_input_names
+        feature_extractor_input_names = self.feature_extractor.model_input_names
+        return list(
+            dict.fromkeys(
+                tokenizer_input_names
+                + feature_extractor_input_names
+                + ["feature_attention_mask"]
+            )
+        )
+
+
+AutoProcessor.register("Qwen3ASRProcessor", Qwen3ASRProcessor)