[VLM] Reorganize profiling/processing-related code (#11812)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

vllm/multimodal/processing.py

@@ -4,12 +4,13 @@ from collections import defaultdict
 from collections.abc import Callable, ItemsView, Iterable, Mapping, Sequence
 from dataclasses import dataclass, field
 from functools import lru_cache
-from typing import Any, NamedTuple, Optional, Protocol, TypeVar, Union
+from typing import (TYPE_CHECKING, Generic, NamedTuple, Optional, Protocol,
+                    TypeVar, Union)
 
 from transformers import BatchFeature, PretrainedConfig, ProcessorMixin
 
-from vllm import envs
-from vllm.inputs import DummyData, InputProcessingContext
+import vllm.envs as envs
+from vllm.inputs import InputProcessingContext
 from vllm.logger import init_logger
 from vllm.transformers_utils.tokenizer import (AnyTokenizer, decode_tokens,
                                                encode_tokens)
@@ -20,7 +21,9 @@ from .inputs import (MultiModalDataDict, MultiModalFieldConfig,
                      MultiModalInputsV2, MultiModalKwargs,
                      MultiModalKwargsItem, PlaceholderRange)
 from .parse import MultiModalDataItems, MultiModalDataParser
-from .profiling import BaseProfilingInfo
+
+if TYPE_CHECKING:
+    from .profiling import BaseDummyInputsBuilder
 
 logger = init_logger(__name__)
 
@@ -46,8 +49,8 @@ class PromptReplacement:
     if it does not depend on the input.
     """
 
-    def bind(self, tokenizer: AnyTokenizer) -> "_BoundPromptReplacement":
-        return _BoundPromptReplacement(
+    def bind(self, tokenizer: AnyTokenizer) -> "BoundPromptReplacement":
+        return BoundPromptReplacement(
             tokenizer=tokenizer,
             modality=self.modality,
             _target=self.target,
@@ -128,7 +131,7 @@ class _BoundPromptSequence:
 
 
 @dataclass
-class _BoundPromptReplacement:
+class BoundPromptReplacement:
     tokenizer: AnyTokenizer = field(repr=False)
     modality: str
 
@@ -207,7 +210,7 @@ def iter_token_matches(
 
 @dataclass(repr=False)
 class _PromptReplacementMatch(ABC):
-    prompt_repl: _BoundPromptReplacement
+    prompt_repl: BoundPromptReplacement
 
     @property
     def modality(self) -> str:
@@ -255,7 +258,7 @@ class _PromptReplacementTextMatch(_PromptReplacementMatch):
 
 
 @dataclass
-class _PlaceholderInfo:
+class PlaceholderInfo:
     modality: str
     item_idx: int
     start_idx: int
@@ -274,7 +277,7 @@ class _PlaceholderInfo:
 
 def find_token_matches(
     prompt: list[int],
-    prompt_repls: Sequence[_BoundPromptReplacement],
+    prompt_repls: Sequence[BoundPromptReplacement],
 ) -> list[_PromptReplacementTokenMatch]:
     """Return each target of :code:`prompt_repls` found in :code:`prompt`."""
     return [
@@ -286,7 +289,7 @@ def find_token_matches(
 
 def find_text_matches(
     prompt: str,
-    prompt_repls: Sequence[_BoundPromptReplacement],
+    prompt_repls: Sequence[BoundPromptReplacement],
 ) -> list[_PromptReplacementTextMatch]:
     """Return each target of :code:`prompt_repls` found in :code:`prompt`."""
     return [
@@ -390,9 +393,9 @@ def replace_text_matches(
 def _iter_modality_placeholders(
     prompt: list[int],
     modality: str,
-    modality_repls: Sequence[_BoundPromptReplacement],
+    modality_repls: Sequence[BoundPromptReplacement],
     modal_item_count: int,
-) -> Iterable[_PlaceholderInfo]:
+) -> Iterable[PlaceholderInfo]:
     if modal_item_count == 0:
         return
 
@@ -413,7 +416,7 @@ def _iter_modality_placeholders(
                 continue
 
             if prompt[start_idx:end_idx] == repl_tokens:
-                yield _PlaceholderInfo(
+                yield PlaceholderInfo(
                     modality=modality,
                     item_idx=item_idx,
                     start_idx=start_idx,
@@ -434,10 +437,10 @@ def _iter_modality_placeholders(
 
 
 def _iter_placeholders(
-    mm_prompt_repls: Mapping[str, Sequence[_BoundPromptReplacement]],
+    mm_prompt_repls: Mapping[str, Sequence[BoundPromptReplacement]],
     prompt: list[int],
     mm_item_counts: Mapping[str, int],
-) -> Iterable[_PlaceholderInfo]:
+) -> Iterable[PlaceholderInfo]:
     """
     For each modality, yield each set of placeholder tokens found in
     :code:`prompt`.
@@ -455,10 +458,10 @@ def _iter_placeholders(
 
 
 def find_mm_placeholders(
-    mm_prompt_repls: Mapping[str, Sequence[_BoundPromptReplacement]],
+    mm_prompt_repls: Mapping[str, Sequence[BoundPromptReplacement]],
     prompt: list[int],
     mm_item_counts: Mapping[str, int],
-) -> Mapping[str, list[_PlaceholderInfo]]:
+) -> Mapping[str, list[PlaceholderInfo]]:
     it = _iter_placeholders(mm_prompt_repls, prompt, mm_item_counts)
     return dict(full_groupby_modality(it))
 
@@ -524,29 +527,59 @@ class ProcessingCache:
         self._cache.put(cache_key, output_kwargs)
 
 
-class ProcessingMixin:
-    """
-    Contains helper functions to perform processing.
+class BaseProcessingInfo:
+    """Base class containing information to perform processing."""
 
-    Not to be confused with :class:`transformers.ProcessorMixin`.
-    """
-    ctx: InputProcessingContext
+    def __init__(self, ctx: InputProcessingContext) -> None:
+        super().__init__()
 
-    def _get_tokenizer(self) -> AnyTokenizer:
+        self.ctx = ctx
+
+    @property
+    def model_id(self) -> str:
+        return self.ctx.model_config.model
+
+    def get_tokenizer(self) -> AnyTokenizer:
         return self.ctx.tokenizer
 
-    def _get_hf_config(self) -> PretrainedConfig:
+    def get_hf_config(self) -> PretrainedConfig:
         return self.ctx.get_hf_config()
 
-    def _get_hf_processor(self, **kwargs: object) -> ProcessorMixin:
+    def get_hf_processor(self, **kwargs: object) -> ProcessorMixin:
         """
         Subclasses can override this method to handle
         specific kwargs from model config or user inputs.
         """
         return self.ctx.get_hf_processor(**kwargs)
 
+    @abstractmethod
+    def get_supported_mm_limits(self) -> Mapping[str, Optional[int]]:
+        """
+        Return the maximum supported number of items for each modality.
+
+        A value of `None` means unlimited number of items.
+
+        Omitting a modality from the returned dictionary means that
+        it is not supported at all.
+        """
+        raise NotImplementedError
+
+    @abstractmethod
+    def get_mm_max_tokens_per_item(self, seq_len: int) -> Mapping[str, int]:
+        """
+        Get the maximum possible number of tokens per data item
+        for each modality.
+
+        The dictionary returned by this method should have the same
+        keys as that returned by :meth:`get_supported_mm_limits`.
+        """
+        raise NotImplementedError
+
+
+_I = TypeVar("_I", bound=BaseProcessingInfo)
 
-class BaseMultiModalProcessor(ProcessingMixin, ABC):
+
+class BaseMultiModalProcessor(ABC, Generic[_I]):
     """
     Abstract base class to process multi-modal inputs to be used in vLLM.
 
@@ -554,18 +587,19 @@ class BaseMultiModalProcessor(ProcessingMixin, ABC):
     """
 
     def __init__(self,
-                 ctx: InputProcessingContext,
+                 info: _I,
+                 dummy_inputs: "BaseDummyInputsBuilder[_I]",
                  *,
                  cache: Optional[ProcessingCache] = None,
                  enable_sanity_checks: bool = True) -> None:
         super().__init__()
 
-        self.ctx = ctx
+        self.info = info
+        self.dummy_inputs = dummy_inputs
         self.cache = cache
         self.enable_sanity_checks = enable_sanity_checks
 
         self.data_parser = self._get_data_parser()
-        self.profiling_info = self._get_profiling_info()
 
     def __call__(
         self,
@@ -585,13 +619,6 @@ class BaseMultiModalProcessor(ProcessingMixin, ABC):
         """
         return MultiModalDataParser()
 
-    def _get_profiling_info(self) -> BaseProfilingInfo:
-        """
-        Get the profiling information to find the worst-case memory usage of
-        the model.
-        """
-        raise NotImplementedError
-
     def _to_mm_items(
         self,
         mm_data: MultiModalDataDict,
@@ -602,7 +629,7 @@ class BaseMultiModalProcessor(ProcessingMixin, ABC):
         """
         mm_items = self.data_parser.parse_mm_data(mm_data)
 
-        mm_limits = self.ctx.get_mm_config().limit_per_prompt
+        mm_limits = self.info.ctx.get_mm_config().limit_per_prompt
         for modality, items in mm_items.items():
             limit = mm_limits.get(modality, 1)
             if len(items) > limit:
@@ -646,19 +673,19 @@ class BaseMultiModalProcessor(ProcessingMixin, ABC):
 
     def _find_mm_placeholders(
         self,
-        mm_prompt_repls: Mapping[str, Sequence[_BoundPromptReplacement]],
+        mm_prompt_repls: Mapping[str, Sequence[BoundPromptReplacement]],
         new_token_ids: list[int],
         mm_item_counts: Mapping[str, int],
-    ) -> Mapping[str, list[_PlaceholderInfo]]:
+    ) -> Mapping[str, list[PlaceholderInfo]]:
         return find_mm_placeholders(mm_prompt_repls, new_token_ids,
                                     mm_item_counts)
 
     def _get_hf_mm_data(
         self,
         mm_items: MultiModalDataItems,
-    ) -> tuple[dict[str, Any], dict[str, Any]]:
-        processor_data = dict[str, Any]()
-        passthrough_data = dict[str, Any]()
+    ) -> tuple[Mapping[str, object], Mapping[str, object]]:
+        processor_data = dict[str, object]()
+        passthrough_data = dict[str, object]()
 
         for items in mm_items.values():
             processor_data.update(items.get_processor_data())
@@ -678,8 +705,8 @@ class BaseMultiModalProcessor(ProcessingMixin, ABC):
         Call the HF processor on the prompt text and
         associated multi-modal data.
         """
-        return self.ctx.call_hf_processor(
-            self._get_hf_processor(**mm_kwargs),
+        return self.info.ctx.call_hf_processor(
+            self.info.get_hf_processor(**mm_kwargs),
             dict(text=prompt, **mm_data),
             mm_kwargs,
         )
@@ -738,8 +765,8 @@ class BaseMultiModalProcessor(ProcessingMixin, ABC):
 
         # Some HF processors (e.g. Qwen2-VL) expect corresponding
         # multi-modal tokens to be in the prompt text
-        dummy_inputs = self.profiling_info.get_dummy_processor_inputs(
-            self.ctx.model_config.max_model_len,
+        dummy_inputs = self.dummy_inputs.get_dummy_processor_inputs(
+            self.info.ctx.model_config.max_model_len,
             mm_missing_counts,
         )
 
@@ -762,7 +789,7 @@ class BaseMultiModalProcessor(ProcessingMixin, ABC):
         caching the results and reusing cached results.
         """
         cache = self.cache
-        model_id = self.ctx.model_config.model
+        model_id = self.info.model_id
 
         _, passthrough_data = self._get_hf_mm_data(mm_data_items)
         if cache is None or passthrough_data:
@@ -838,8 +865,8 @@ class BaseMultiModalProcessor(ProcessingMixin, ABC):
     def _bind_and_group_repls(
         self,
         prompt_repls: list[PromptReplacement],
-    ) -> dict[str, list[_BoundPromptReplacement]]:
-        tokenizer = self._get_tokenizer()
+    ) -> dict[str, list[BoundPromptReplacement]]:
+        tokenizer = self.info.get_tokenizer()
 
         it = (prompt_repl.bind(tokenizer) for prompt_repl in prompt_repls)
         return dict(full_groupby_modality(it))
@@ -859,10 +886,10 @@ class BaseMultiModalProcessor(ProcessingMixin, ABC):
     def _apply_prompt_replacements(
         self,
         token_ids: list[int],
-        mm_prompt_repls: Mapping[str, Sequence[_BoundPromptReplacement]],
+        mm_prompt_repls: Mapping[str, Sequence[BoundPromptReplacement]],
         mm_item_counts: Mapping[str, int],
-    ) -> tuple[list[int], str, Mapping[str, list[_PlaceholderInfo]]]:
-        tokenizer = self._get_tokenizer()
+    ) -> tuple[list[int], str, Mapping[str, list[PlaceholderInfo]]]:
+        tokenizer = self.info.get_tokenizer()
 
         mm_token_matches = {
             modality: find_token_matches(token_ids, prompt_repls)
@@ -950,7 +977,7 @@ class BaseMultiModalProcessor(ProcessingMixin, ABC):
 
     def _validate_mm_placeholders(
         self,
-        mm_placeholders: Mapping[str, list[_PlaceholderInfo]],
+        mm_placeholders: Mapping[str, list[PlaceholderInfo]],
         mm_item_counts: Mapping[str, int],
         *,
         allow_missing: bool = False,
@@ -1001,7 +1028,7 @@ class BaseMultiModalProcessor(ProcessingMixin, ABC):
         # instead of rehashing.
 
         if envs.VLLM_USE_V1:
-            model_id = self.ctx.model_config.model
+            model_id = self.info.model_id
             mm_hashes = {
                 modality: [
                     MultiModalHasher.hash_kwargs(model_id=model_id,
@@ -1046,7 +1073,7 @@ class BaseMultiModalProcessor(ProcessingMixin, ABC):
                 allow_missing=True,
             )
 
-            mm_missing_repls = dict[str, list[_BoundPromptReplacement]]()
+            mm_missing_repls = dict[str, list[BoundPromptReplacement]]()
             for modality, missing_repl_count in mm_missing_repl_counts.items():
                 if missing_repl_count == 0:
                     mm_missing_repls[modality] = []
@@ -1059,7 +1086,7 @@ class BaseMultiModalProcessor(ProcessingMixin, ABC):
         # If HF processor already inserts placeholder tokens,
         # there is no need for us to insert them
         if all(len(repls) == 0 for repls in mm_missing_repls.items()):
-            tokenizer = self._get_tokenizer()
+            tokenizer = self.info.get_tokenizer()
             prompt_text = decode_tokens(tokenizer, prompt_ids)
             mm_placeholders = hf_mm_placeholders
         else:
@@ -1090,79 +1117,3 @@ class BaseMultiModalProcessor(ProcessingMixin, ABC):
             mm_hashes=mm_hashes,
             mm_placeholders=mm_placeholder_ranges,
         )
-
-    def _get_dummy_mm_inputs(
-        self,
-        seq_len: int,
-        mm_counts: Mapping[str, int],
-    ) -> MultiModalInputsV2:
-        profiling = self.profiling_info
-        processor_inputs = profiling.get_dummy_processor_inputs(
-            seq_len, mm_counts)
-
-        return self.apply(
-            prompt_text=processor_inputs.prompt_text,
-            mm_data=processor_inputs.mm_data,
-            hf_processor_mm_kwargs=processor_inputs.hf_processor_mm_kwargs,
-        )
-
-    def get_dummy_data(self, seq_len: int) -> DummyData:
-        # Avoid circular import
-        from vllm.sequence import SequenceData
-
-        profiling = self.profiling_info
-        mm_counts = profiling.get_mm_limits()
-        mm_max_tokens_per_item = profiling.get_mm_max_tokens_per_item(seq_len)
-        if mm_counts.keys() != mm_max_tokens_per_item.keys():
-            raise AssertionError(
-                "The keys returned by `get_supported_mm_limits`"
-                f"({set(mm_counts.keys())}) should be the same as those "
-                "returned by `get_mm_max_tokens_per_item` "
-                f"({set(mm_max_tokens_per_item.keys())})")
-
-        mm_inputs = self._get_dummy_mm_inputs(seq_len, mm_counts)
-        prompt_token_ids = mm_inputs["prompt_token_ids"]
-        placeholders_by_modality = mm_inputs["mm_placeholders"]
-
-        total_placeholders_by_modality = {
-            modality: sum(item["length"] for item in placeholders)
-            for modality, placeholders in placeholders_by_modality.items()
-        }
-        expected_placeholders_by_modality = {
-            modality: mm_max_tokens_per_item[modality] * mm_counts[modality]
-            for modality in placeholders_by_modality
-        }
-        if total_placeholders_by_modality != expected_placeholders_by_modality:
-            raise AssertionError(
-                f"The processed dummy data has a total of "
-                f"{total_placeholders_by_modality} placeholder tokens, which "
-                f"is not the expected {expected_placeholders_by_modality} "
-                "tokens.")
-
-        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)
-
-            return DummyData(
-                seq_data=SequenceData.from_prompt_token_counts((0, seq_len)),
-                multi_modal_data=None,
-                multi_modal_placeholders=None,
-            )
-
-        prompt_token_ids.extend([0] * (seq_len - len(prompt_token_ids)))
-
-        return DummyData(
-            seq_data=SequenceData.from_seqs(prompt_token_ids),
-            multi_modal_data=mm_inputs["mm_kwargs"],
-            multi_modal_placeholders=placeholders_by_modality,
-        )

vllm/multimodal/profiling.py

 from abc import ABC, abstractmethod
 from collections.abc import Mapping
 from dataclasses import dataclass, field
-from typing import Optional
+from typing import Generic, TypeVar
 
 import numpy as np
 import numpy.typing as npt
 from PIL import Image
 
-from vllm.inputs import InputProcessingContext
+import vllm.envs as envs
+from vllm.inputs import DummyData
 from vllm.logger import init_logger
 
-from .inputs import MultiModalDataDict
+from .inputs import MultiModalDataDict, MultiModalInputsV2
+from .processing import BaseMultiModalProcessor, BaseProcessingInfo
 
 logger = init_logger(__name__)
 
@@ -23,39 +25,19 @@ class ProcessorInputs:
     hf_processor_mm_kwargs: Mapping[str, object] = field(default_factory=dict)
 
 
-class BaseProfilingInfo(ABC):
+_I = TypeVar("_I", bound=BaseProcessingInfo)
+
+
+class BaseDummyInputsBuilder(ABC, Generic[_I]):
     """
-    Abstract base class that provides the information necessary to profile
+    Abstract base class that constructs the dummy data to profile
     multi-modal models.
     """
 
-    def __init__(self, ctx: InputProcessingContext) -> None:
+    def __init__(self, info: _I) -> None:
         super().__init__()
 
-        self.ctx = ctx
-
-    @abstractmethod
-    def get_supported_mm_limits(self) -> Mapping[str, Optional[int]]:
-        """
-        Return the maximum supported number of items for each modality.
-
-        A value of `None` means unlimited number of items.
-
-        Omitting a modality from the returned dictionary means that
-        it is not supported at all.
-        """
-        raise NotImplementedError
-
-    @abstractmethod
-    def get_mm_max_tokens_per_item(self, seq_len: int) -> Mapping[str, int]:
-        """
-        Get the maximum possible number of tokens per data item
-        for each modality.
-
-        The dictionary returned by this method should have the same
-        keys as that returned by :meth:`get_supported_mm_limits`.
-        """
-        raise NotImplementedError
+        self.info = info
 
     @abstractmethod
     def get_dummy_processor_inputs(
@@ -64,8 +46,8 @@ class BaseProfilingInfo(ABC):
         mm_counts: Mapping[str, int],
     ) -> ProcessorInputs:
         """
-        Build the multi-modal portion of the input which, after processing,
-        results in `mm_max_tokens` in :meth:`get_mm_max_tokens_per_item`.
+        Build the input which, after processing, results in
+        `self.info.get_mm_max_tokens_per_item()` placeholder tokens.
         """
         raise NotImplementedError
 
@@ -99,11 +81,33 @@ class BaseProfilingInfo(ABC):
         video = np.zeros((num_frames, width, height, 3))
         return [video] * num_videos
 
-    def get_mm_limits(self) -> Mapping[str, int]:
-        mm_config = self.ctx.get_mm_config()
+
+class MultiModalProfiler(Generic[_I]):
+    """
+    Contains code for running memory profiling for multi-modal models.
+    """
+
+    def __init__(
+        self,
+        processor: BaseMultiModalProcessor[_I],
+    ) -> None:
+        super().__init__()
+
+        self.processor = processor
+
+    @property
+    def processing_info(self) -> BaseProcessingInfo:
+        return self.processor.info
+
+    @property
+    def dummy_inputs(self) -> BaseDummyInputsBuilder[_I]:
+        return self.processor.dummy_inputs
+
+    def _get_mm_limits(self) -> Mapping[str, int]:
+        mm_config = self.processing_info.ctx.get_mm_config()
         mm_limit_per_prompt = mm_config.limit_per_prompt
 
-        supported_mm_limits = self.get_supported_mm_limits()
+        supported_mm_limits = self.processing_info.get_supported_mm_limits()
 
         mm_limits = {
             modality: mm_limit_per_prompt.get(modality, 1)
@@ -119,3 +123,81 @@ class BaseProfilingInfo(ABC):
                     f"at most {supported_limit} {modality} items.")
 
         return mm_limits
+
+    def _get_dummy_mm_inputs(
+        self,
+        seq_len: int,
+        mm_counts: Mapping[str, int],
+    ) -> MultiModalInputsV2:
+        factory = self.dummy_inputs
+        processor_inputs = factory.get_dummy_processor_inputs(
+            seq_len, mm_counts)
+
+        return self.processor.apply(
+            prompt_text=processor_inputs.prompt_text,
+            mm_data=processor_inputs.mm_data,
+            hf_processor_mm_kwargs=processor_inputs.hf_processor_mm_kwargs,
+        )
+
+    def get_dummy_data(self, seq_len: int) -> DummyData:
+        # Avoid circular import
+        from vllm.sequence import SequenceData
+
+        mm_counts = self._get_mm_limits()
+
+        info = self.processing_info
+        mm_max_tokens_per_item = info.get_mm_max_tokens_per_item(seq_len)
+
+        if mm_counts.keys() != mm_max_tokens_per_item.keys():
+            raise AssertionError(
+                "The keys returned by `get_supported_mm_limits`"
+                f"({set(mm_counts.keys())}) should be the same as those "
+                "returned by `get_mm_max_tokens_per_item` "
+                f"({set(mm_max_tokens_per_item.keys())})")
+
+        mm_inputs = self._get_dummy_mm_inputs(seq_len, mm_counts)
+        prompt_token_ids = mm_inputs["prompt_token_ids"]
+        placeholders_by_modality = mm_inputs["mm_placeholders"]
+
+        total_placeholders_by_modality = {
+            modality: sum(item["length"] for item in placeholders)
+            for modality, placeholders in placeholders_by_modality.items()
+        }
+        expected_placeholders_by_modality = {
+            modality: mm_max_tokens_per_item[modality] * mm_counts[modality]
+            for modality in placeholders_by_modality
+        }
+        if total_placeholders_by_modality != expected_placeholders_by_modality:
+            raise AssertionError(
+                f"The processed dummy data has a total of "
+                f"{total_placeholders_by_modality} placeholder tokens, which "
+                f"is not the expected {expected_placeholders_by_modality} "
+                "tokens.")
+
+        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)
+
+            return DummyData(
+                seq_data=SequenceData.from_prompt_token_counts((0, seq_len)),
+                multi_modal_data=None,
+                multi_modal_placeholders=None,
+            )
+
+        prompt_token_ids.extend([0] * (seq_len - len(prompt_token_ids)))
+
+        return DummyData(
+            seq_data=SequenceData.from_seqs(prompt_token_ids),
+            multi_modal_data=mm_inputs["mm_kwargs"],
+            multi_modal_placeholders=placeholders_by_modality,
+        )

vllm/multimodal/registry.py

 import functools
 from collections import UserDict
-from typing import (TYPE_CHECKING, Any, Dict, Mapping, Optional, Protocol,
-                    Sequence, Type, TypeVar)
+from dataclasses import dataclass
+from typing import (TYPE_CHECKING, Any, Dict, Generic, Mapping, Optional,
+                    Protocol, Sequence, Type, TypeVar)
 
 import torch.nn as nn
 
@@ -14,7 +15,9 @@ from .audio import AudioPlugin
 from .base import MultiModalInputMapper, MultiModalPlugin, MultiModalTokensCalc
 from .image import ImagePlugin
 from .inputs import MultiModalDataDict, MultiModalKwargs, NestedTensors
-from .processing import BaseMultiModalProcessor, ProcessingCache
+from .processing import (BaseMultiModalProcessor, BaseProcessingInfo,
+                         ProcessingCache)
+from .profiling import BaseDummyInputsBuilder
 from .utils import cached_get_tokenizer
 from .video import VideoPlugin
 
@@ -27,20 +30,59 @@ logger = init_logger(__name__)
 MM_CACHE_SIZE = 256
 
 N = TypeVar("N", bound=Type[nn.Module])
+_I = TypeVar("_I", bound=BaseProcessingInfo)
+_I_co = TypeVar("_I_co", bound=BaseProcessingInfo, covariant=True)
 
 
-class MultiModalProcessorFactory(Protocol):
+class ProcessingInfoFactory(Protocol[_I_co]):
     """Constructs a :class:`MultiModalProcessor` instance from the context."""
 
     def __call__(
         self,
         ctx: InputProcessingContext,
+    ) -> _I_co:
+        ...
+
+
+class DummyInputsBuilderFactory(Protocol[_I]):
+    """
+    Constructs a :class:`BaseDummyInputsBuilder` instance from the context.
+    """
+
+    def __call__(self, info: _I) -> BaseDummyInputsBuilder[_I]:
+        ...
+
+
+class MultiModalProcessorFactory(Protocol[_I]):
+    """Constructs a :class:`MultiModalProcessor` instance from the context."""
+
+    def __call__(
+        self,
+        info: _I,
+        dummy_inputs: BaseDummyInputsBuilder[_I],
         *,
         cache: Optional[ProcessingCache] = None,
-    ) -> BaseMultiModalProcessor:
+    ) -> BaseMultiModalProcessor[_I]:
         ...
 
 
+@dataclass(frozen=True)
+class _ProcessorFactories(Generic[_I]):
+    info: ProcessingInfoFactory[_I]
+    processor: MultiModalProcessorFactory[_I]
+    dummy_inputs: DummyInputsBuilderFactory[_I]
+
+    def build_processor(
+        self,
+        ctx: InputProcessingContext,
+        *,
+        cache: Optional[ProcessingCache] = None,
+    ):
+        info = self.info(ctx)
+        dummy_inputs_builder = self.dummy_inputs(info)
+        return self.processor(info, dummy_inputs_builder, cache=cache)
+
+
 class _MultiModalLimits(UserDict["ModelConfig", Dict[str, int]]):
     """
     Wraps `_limits_by_model` for a more informative error message
@@ -71,7 +113,7 @@ class MultiModalRegistry:
         self._plugins = {p.get_data_key(): p for p in plugins}
 
         self._processor_factories = ClassRegistry[nn.Module,
-                                                  MultiModalProcessorFactory]()
+                                                  _ProcessorFactories]()
 
         # This is used for non-multimodal models
         self._disabled_limits_per_plugin = {k: 0 for k in self._plugins}
@@ -224,7 +266,7 @@ class MultiModalRegistry:
             tokenizer = cached_get_tokenizer(model_config.tokenizer)
             processor = self.create_processor(model_config, tokenizer)
             seq_len = model_config.max_model_len
-            return processor.profiling_info.get_mm_max_tokens_per_item(seq_len)
+            return processor.info.get_mm_max_tokens_per_item(seq_len)
 
         return {
             key: plugin.get_max_multimodal_tokens(model_config)
@@ -315,7 +357,10 @@ class MultiModalRegistry:
 
     def register_processor(
         self,
-        factory: MultiModalProcessorFactory,
+        processor: MultiModalProcessorFactory[_I],
+        *,
+        info: ProcessingInfoFactory[_I],
+        dummy_inputs: DummyInputsBuilderFactory[_I],
     ):
         """
         Register a multi-modal processor to a model class. The processor
@@ -336,7 +381,11 @@ class MultiModalRegistry:
                     "registered to %s. It is overwritten by the new one.",
                     model_cls, self)
 
-            self._processor_factories[model_cls] = factory
+            self._processor_factories[model_cls] = _ProcessorFactories(
+                info=info,
+                dummy_inputs=dummy_inputs,
+                processor=processor,
+            )
 
             return model_cls
 
@@ -359,15 +408,15 @@ class MultiModalRegistry:
         self,
         model_config: "ModelConfig",
         tokenizer: AnyTokenizer,
-    ) -> BaseMultiModalProcessor:
+    ) -> BaseMultiModalProcessor[BaseProcessingInfo]:
         """
         Create a multi-modal processor for a specific model and tokenizer.
         """
         model_cls = self._get_model_cls(model_config)
-        processor_factory = self._processor_factories[model_cls]
+        factories = self._processor_factories[model_cls]
 
         ctx = InputProcessingContext(model_config, tokenizer)
         cache = (None if model_config.disable_mm_preprocessor_cache else
                  self._processing_cache)
 
-        return processor_factory(ctx, cache=cache)
+        return factories.build_processor(ctx, cache=cache)