[VLM] Implement merged multimodal processor for Mllama (#11427)

tests/models/encoder_decoder/vision_language/test_mllama.py

@@ -7,11 +7,11 @@ import torch
 from transformers import (AutoConfig, AutoModelForVision2Seq, AutoTokenizer,
                           BatchEncoding)
 
+from vllm import LLM, SamplingParams
 from vllm.attention.backends.flash_attn import FlashAttentionMetadata
 from vllm.attention.selector import (_Backend, _cached_get_attn_backend,
                                      global_force_attn_backend_context_manager)
-from vllm.model_executor.models.mllama import (MLLAMA_IMAGE_TOKEN_ID,
-                                               MllamaForConditionalGeneration)
+from vllm.model_executor.models.mllama import MllamaForConditionalGeneration
 from vllm.multimodal.image import rescale_image_size
 from vllm.sequence import SampleLogprobs
 
@@ -21,6 +21,7 @@ from ....utils import large_gpu_test
 from ...utils import check_logprobs_close
 
 _LIMIT_IMAGE_PER_PROMPT = 3
+MLLAMA_IMAGE_TOKEN_ID = 128256
 
 LIST_ENC_DEC_SUPPORTED_BACKENDS = [_Backend.XFORMERS, _Backend.FLASH_ATTN]
 
@@ -396,6 +397,64 @@ def test_models_interleaved_images(hf_runner, vllm_runner, image_assets, model,
         )
 
 
+@large_gpu_test(min_gb=48)
+@pytest.mark.core_model
+@pytest.mark.parametrize("model", models)
+@pytest.mark.parametrize("dtype", ["bfloat16"])
+@pytest.mark.parametrize("max_tokens", [32])
+def test_explicit_implicit_prompt(
+    image_assets: _ImageAssets,
+    model: str,
+    dtype: str,
+    max_tokens: int,
+):
+    stop_sign = image_assets[0].pil_image
+    # yapf: disable
+    prompts = [
+        # explicit prompt
+        {
+            "encoder_prompt": {
+                "prompt": "<|image|>",
+                "multi_modal_data": {"image": stop_sign},
+            },
+            "decoder_prompt": {
+                "prompt_token_ids": [128000, 791, 2262, 315, 279, 2217, 220, 128256, 374],  # noqa: E501
+            }
+        },
+        {
+            "encoder_prompt": "Not <|image|>",
+            "decoder_prompt": "The color of the sky is blue but sometimes it can also be",  # noqa: E501
+        },
+        # implicit prompt
+        {
+            "prompt": "<|begin_of_text|>The content of the image <|image|> is", # noqa: E501
+            "multi_modal_data": {"image": stop_sign},
+        },
+        {
+            "prompt": "The color of the sky is blue but sometimes it can also be",  # noqa: E501
+        },
+    ]
+    # yapf: enable
+    llm = LLM(
+        model=model,
+        dtype=dtype,
+        max_model_len=4096,
+        max_num_seqs=2,
+        tensor_parallel_size=1,
+        enforce_eager=True,
+    )
+    sampling_params = SamplingParams(
+        temperature=0,
+        max_tokens=max_tokens,
+    )
+    outputs = llm.generate(prompts, sampling_params)
+    n_prompts = len(prompts)
+    explicit_outputs = outputs[:n_prompts // 2]
+    implicit_outputs = outputs[n_prompts // 2:]
+    for exp_output, imp_output in zip(explicit_outputs, implicit_outputs):
+        assert exp_output.outputs[0].text == imp_output.outputs[0].text
+
+
 @large_gpu_test(min_gb=48)
 @pytest.mark.core_model
 @pytest.mark.parametrize("model", models)
@@ -458,6 +517,10 @@ def test_regression(vllm_runner, image_assets, model, dtype, max_tokens,
                                             images=images)
 
 
+class DummyModel:
+    image_token_id = MLLAMA_IMAGE_TOKEN_ID
+
+
 @pytest.mark.core_model
 @pytest.mark.parametrize(
     "input_indices_and_output",
@@ -499,7 +562,7 @@ def test_get_cross_attention_mask(input_indices_and_output) -> None:
         use_cuda_graph=False,
     )
 
-    dummy: dict[str, str] = {}
+    dummy = DummyModel()
 
     cross_attention_mask, kv_range_for_decode = MllamaForConditionalGeneration\
         .get_cross_attention_mask(dummy,
@@ -556,7 +619,7 @@ def test_get_full_text_row_masked_out_mask(input_indices) -> None:
         use_cuda_graph=False,
     )
 
-    dummy: dict[str, str] = {}
+    dummy = DummyModel()
 
     full_text_row_masked_out_mask = MllamaForConditionalGeneration\
         .get_full_text_row_masked_out_mask(dummy,

tests/models/multimodal/processing/test_common.py

@@ -85,6 +85,14 @@ def _test_processing_correctness(
         partial(random_audio, rng, min_len=512, max_len=1024, sr=16000),
     }
 
+    tokenizer_encode_kwargs = {}
+    if model_config.hf_config.model_type == "mllama":
+        # For Mllama, tokenizer will always add bos_token at the beginning of
+        # prompt by default, causing hf_processor outputs incorrect token ids.
+        # So we need use `add_special_tokens=False` here to leave bos_token
+        # to be added by the processor.
+        tokenizer_encode_kwargs = {"add_special_tokens": False}
+
     for batch_idx in range(num_batches):
         mm_data = {
             k:
@@ -122,7 +130,7 @@ def _test_processing_correctness(
             f"Failed ({batch_idx=}, {prompt=}, {mm_data=})")
 
         baseline_tokenized_result = baseline_processor.apply(
-            tokenizer.encode(prompt),
+            tokenizer.encode(prompt, **tokenizer_encode_kwargs),
             mm_data=mm_data,
             hf_processor_mm_kwargs={},
         )
@@ -131,7 +139,7 @@ def _test_processing_correctness(
             f"Failed ({batch_idx=}, {prompt=}, {mm_data=})")
 
         cached_tokenized_result = cached_processor.apply(
-            tokenizer.encode(prompt),
+            tokenizer.encode(prompt, **tokenizer_encode_kwargs),
             mm_data=mm_data,
             hf_processor_mm_kwargs={},
         )
@@ -155,6 +163,7 @@ def _test_processing_correctness(
     "llava-hf/llava-v1.6-mistral-7b-hf",
     "llava-hf/LLaVA-NeXT-Video-7B-hf",
     "llava-hf/llava-onevision-qwen2-0.5b-ov-hf",
+    "meta-llama/Llama-3.2-11B-Vision-Instruct",
     "TIGER-Lab/Mantis-8B-siglip-llama3",
     "mistral-community/pixtral-12b",
     "openbmb/MiniCPM-o-2_6",

vllm/inputs/preprocess.py

 # SPDX-License-Identifier: Apache-2.0
 
 import asyncio
-from typing import List, Mapping, Optional, Union
+from typing import List, Mapping, Optional, Tuple, Union, cast
 
 from typing_extensions import assert_never
 
@@ -9,7 +9,8 @@ from vllm.config import ModelConfig
 from vllm.logger import init_logger
 from vllm.lora.request import LoRARequest
 from vllm.multimodal import MULTIMODAL_REGISTRY, MultiModalRegistry
-from vllm.multimodal.inputs import MultiModalDataDict, MultiModalInputs
+from vllm.multimodal.inputs import (MultiModalDataDict, MultiModalEncDecInputs,
+                                    MultiModalInputs)
 from vllm.prompt_adapter.request import PromptAdapterRequest
 from vllm.transformers_utils.tokenizer_group import BaseTokenizerGroup
 
@@ -495,6 +496,51 @@ class InputPreprocessor:
             decoder=decoder_inputs,
         )
 
+    def _separate_enc_dec_inputs_from_mm_processor_outputs(
+        self,
+        inputs: SingletonInputs,
+        decoder_inputs_to_override: Optional[SingletonInputs] = None,
+    ) -> Tuple[SingletonInputs, SingletonInputs]:
+        """
+        For encoder/decoder models only:
+        Separate Encoder/Decoder inputs from a MultiModalEncDecInputs
+        """
+        encoder_inputs: SingletonInputs
+        decoder_inputs: SingletonInputs
+        if inputs["type"] == "multimodal":
+            # Multimodal data inputs
+            assert ("encoder_prompt" in inputs
+                    and "encoder_prompt_token_ids" in inputs)
+            inputs = cast(MultiModalEncDecInputs, inputs)
+            encoder_inputs = token_inputs(
+                prompt=inputs["encoder_prompt"],
+                prompt_token_ids=inputs["encoder_prompt_token_ids"],
+            )
+            if decoder_inputs_to_override is not None:
+                decoder_inputs = MultiModalInputs(
+                    type="multimodal",
+                    prompt=decoder_inputs_to_override.get("prompt", ""),
+                    prompt_token_ids=decoder_inputs_to_override[
+                        "prompt_token_ids"],
+                    mm_kwargs=inputs["mm_kwargs"],
+                    mm_placeholders=inputs["mm_placeholders"],
+                )
+            else:
+                decoder_inputs = MultiModalInputs(
+                    type="multimodal",
+                    prompt=inputs["prompt"],
+                    prompt_token_ids=inputs["prompt_token_ids"],
+                    mm_kwargs=inputs["mm_kwargs"],
+                    mm_placeholders=inputs["mm_placeholders"],
+                )
+        elif inputs["type"] == "token":
+            # Text-only inputs
+            encoder_inputs = token_inputs(prompt="", prompt_token_ids=[])
+            decoder_inputs = decoder_inputs_to_override or inputs
+        else:
+            assert_never(inputs)  # type: ignore[arg-type]
+        return encoder_inputs, decoder_inputs
+
     def _process_encoder_decoder_prompt(
         self,
         prompt: PromptType,
@@ -539,7 +585,6 @@ class InputPreprocessor:
                 prompt["encoder_prompt"],
                 request_id=request_id,
             )
-
             if (decoder_input := prompt["decoder_prompt"]) is None:
                 decoder_inputs = None
             else:
@@ -547,13 +592,28 @@ class InputPreprocessor:
                     decoder_input,
                     request_id=request_id,
                 )
+            # For multimodal model, override decoder prompt from processor
+            # with explicit decoder prompt.
+            if self.model_config.is_multimodal_model and (
+                    self._can_process_multimodal()):
+                encoder_inputs, decoder_inputs = (
+                    self._separate_enc_dec_inputs_from_mm_processor_outputs(
+                        encoder_inputs, decoder_inputs))
         else:
-            encoder_inputs = self._prompt_to_llm_inputs(
+            inputs = self._prompt_to_llm_inputs(
                 prompt,
                 request_id=request_id,
             )
+            if self.model_config.is_multimodal_model and (
+                    self._can_process_multimodal()):
+                # Encoder-Decoder Multimodal model
+                encoder_inputs, decoder_inputs = (
+                    self._separate_enc_dec_inputs_from_mm_processor_outputs(
+                        inputs))
+            else:
+                encoder_inputs = inputs
 
-            decoder_inputs = None
+                decoder_inputs = None
 
         return self._build_enc_dec_llm_inputs(encoder_inputs, decoder_inputs)
 
@@ -583,13 +643,29 @@ class InputPreprocessor:
 
                 encoder_inputs, decoder_inputs = await asyncio.gather(
                     encoder_task, decoder_task)
+
+            # For multimodal model, override decoder prompt from processor
+            # with explicit decoder prompt.
+            if self.model_config.is_multimodal_model and (
+                    self._can_process_multimodal()):
+                encoder_inputs, decoder_inputs = (
+                    self._separate_enc_dec_inputs_from_mm_processor_outputs(
+                        encoder_inputs, decoder_inputs))
         else:
-            encoder_inputs = await self._prompt_to_llm_inputs_async(
+            inputs = await self._prompt_to_llm_inputs_async(
                 prompt,
                 request_id=request_id,
             )
+            if self.model_config.is_multimodal_model and (
+                    self._can_process_multimodal()):
+                # Encoder-Decoder Multimodal model
+                encoder_inputs, decoder_inputs = (
+                    self._separate_enc_dec_inputs_from_mm_processor_outputs(
+                        inputs))
+            else:
+                encoder_inputs = inputs
 
-            decoder_inputs = None
+                decoder_inputs = None
 
         return self._build_enc_dec_llm_inputs(encoder_inputs, decoder_inputs)
 

vllm/inputs/registry.py

@@ -350,7 +350,8 @@ class InputRegistry:
             )
             processor = mm_registry.create_processor(model_config, tokenizer)
             profiler = MultiModalProfiler(processor)
-            dummy_data = profiler.get_dummy_data(seq_len)
+            dummy_data = profiler.get_dummy_data(
+                seq_len, is_encoder_data=is_encoder_data)
         else:
             model_cls, _ = get_model_architecture(model_config)
             if is_encoder_data:

vllm/multimodal/inputs.py

@@ -739,3 +739,19 @@ class MultiModalInputs(TypedDict):
     For each modality, information about the placeholder tokens in
     :code:`prompt_token_ids`.
     """
+
+
+class MultiModalEncDecInputs(MultiModalInputs):
+    """
+    Represents the outputs of :class:`vllm.multimodal.EncDecMultiModalProcessor`
+    ready to be passed to vLLM internals.
+    """
+
+    encoder_prompt: str
+    """The processed encoder prompt text."""
+
+    encoder_prompt_token_ids: list[int]
+    """The processed token IDs of the encoder prompt."""
+
+    encoder_token_type_ids: NotRequired[list[int]]
+    """The token type IDs of the encoder prompt."""

vllm/multimodal/processing.py

@@ -20,9 +20,9 @@ from vllm.transformers_utils.tokenizer import (AnyTokenizer, decode_tokens,
 from vllm.utils import LRUCache, flatten_2d_lists, full_groupby
 
 from .hasher import MultiModalHasher
-from .inputs import (MultiModalDataDict, MultiModalFieldConfig,
-                     MultiModalInputs, MultiModalKwargs, MultiModalKwargsItem,
-                     PlaceholderRange)
+from .inputs import (MultiModalDataDict, MultiModalEncDecInputs,
+                     MultiModalFieldConfig, MultiModalInputs, MultiModalKwargs,
+                     MultiModalKwargsItem, PlaceholderRange)
 from .parse import MultiModalDataItems, MultiModalDataParser
 
 if TYPE_CHECKING:
@@ -1293,3 +1293,57 @@ class BaseMultiModalProcessor(ABC, Generic[_I]):
             mm_hashes=mm_hashes,
             mm_placeholders=mm_placeholder_ranges,
         )
+
+
+class EncDecMultiModalProcessor(BaseMultiModalProcessor[_I]):
+
+    @abstractmethod
+    def create_encoder_prompt(
+        self,
+        prompt: Union[str, list[int]],
+        mm_data: MultiModalDataDict,
+    ) -> Union[str, list[int]]:
+        """Create input prompt for the encoder."""
+        raise NotImplementedError
+
+    def apply(
+        self,
+        prompt: Union[str, list[int]],
+        mm_data: MultiModalDataDict,
+        hf_processor_mm_kwargs: Mapping[str, object],
+    ) -> MultiModalEncDecInputs:
+        """
+        Process multi-modal inputs to be used in vLLM.
+        The main processing steps are modified to fit encoder-decoder model:
+        1. Create encoder prompt from input prompt text.
+        2. Apply the HF processor on encoder prompt.
+        3. Copy the input prompt text as decoder prompt inputs.
+        """
+        encoder_prompt = self.create_encoder_prompt(prompt, mm_data)
+        encoder_inputs = super().apply(
+            encoder_prompt,
+            mm_data,
+            hf_processor_mm_kwargs,
+        )
+
+        # We assumed the decoder prompt text is copied from
+        # the original encoder prompt without extra process
+        tokenizer = self.info.get_tokenizer()
+        if isinstance(prompt, str):
+            decoder_prompt = prompt
+            decoder_prompt_ids = encode_tokens(tokenizer,
+                                               prompt,
+                                               add_special_tokens=False)
+        else:
+            decoder_prompt = decode_tokens(tokenizer, prompt)
+            decoder_prompt_ids = prompt
+
+        mm_inputs = MultiModalEncDecInputs(
+            encoder_prompt=encoder_inputs["prompt"],
+            encoder_prompt_token_ids=encoder_inputs["prompt_token_ids"],
+            **encoder_inputs)
+        mm_inputs.update({
+            "prompt": decoder_prompt,
+            "prompt_token_ids": decoder_prompt_ids
+        })
+        return mm_inputs

vllm/multimodal/profiling.py

@@ -144,7 +144,11 @@ class MultiModalProfiler(Generic[_I]):
             hf_processor_mm_kwargs=processor_inputs.hf_processor_mm_kwargs,
         )
 
-    def get_dummy_data(self, seq_len: int) -> DummyData:
+    def get_dummy_data(
+        self,
+        seq_len: int,
+        is_encoder_data: bool = False,
+    ) -> DummyData:
         # Avoid circular import
         from vllm.sequence import SequenceData
 
@@ -183,16 +187,18 @@ class MultiModalProfiler(Generic[_I]):
         total_len = len(prompt_token_ids)
 
         # V0 does not support chunked prefill.
-        if total_len > seq_len and not envs.VLLM_USE_V1:
-            logger.warning(
-                "The context length (%d) of the model is too short "
-                "to hold the multi-modal embeddings in the worst case "
-                "(%d tokens in total, out of which %s are reserved for "
-                "multi-modal embeddings). This may cause certain multi-modal "
-                "inputs to fail during inference, even when the input text is "
-                "short. To avoid this, you should increase `max_model_len`, "
-                "reduce `max_num_seqs`, and/or reduce `mm_counts`.", seq_len,
-                total_len, total_placeholders_by_modality)
+        if (total_len > seq_len and not envs.VLLM_USE_V1) or is_encoder_data:
+            if total_len > seq_len:
+                logger.warning(
+                    "The context length (%d) of the model is too short "
+                    "to hold the multi-modal embeddings in the worst case "
+                    "(%d tokens in total, out of which %s are reserved for "
+                    "multi-modal embeddings). This may cause certain "
+                    "multi-modal inputs to fail during inference, even when "
+                    "the input text is short. To avoid this, you should "
+                    "increase `max_model_len`, reduce `max_num_seqs`, "
+                    "and/or reduce `mm_counts`.", seq_len, total_len,
+                    total_placeholders_by_modality)
 
             return DummyData(
                 seq_data=SequenceData.from_prompt_token_counts((0, seq_len)),