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# Copyright 2025 the LlamaFactory team.
#
# 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.
from abc import ABC, abstractmethod
from collections.abc import AsyncGenerator
from dataclasses import dataclass
from typing import TYPE_CHECKING, Any, Literal, Optional, Union
if TYPE_CHECKING:
from transformers import PreTrainedModel, PreTrainedTokenizer
from vllm import AsyncLLMEngine
from ..data import Template
from ..data.mm_plugin import AudioInput, ImageInput, VideoInput
from ..extras.constants import EngineName
from ..hparams import DataArguments, FinetuningArguments, GeneratingArguments, ModelArguments
@dataclass
class Response:
response_text: str
response_length: int
prompt_length: int
finish_reason: Literal["stop", "length"]
class BaseEngine(ABC):
r"""Base class for inference engine of chat models.
Must implements async methods: chat(), stream_chat() and get_scores().
"""
name: "EngineName"
model: Union["PreTrainedModel", "AsyncLLMEngine"]
tokenizer: "PreTrainedTokenizer"
can_generate: bool
template: "Template"
generating_args: dict[str, Any]
@abstractmethod
def __init__(
self,
model_args: "ModelArguments",
data_args: "DataArguments",
finetuning_args: "FinetuningArguments",
generating_args: "GeneratingArguments",
) -> None:
r"""Initialize an inference engine."""
...
@abstractmethod
async def chat(
self,
messages: list[dict[str, str]],
system: Optional[str] = None,
tools: Optional[str] = None,
images: Optional[list["ImageInput"]] = None,
videos: Optional[list["VideoInput"]] = None,
audios: Optional[list["AudioInput"]] = None,
**input_kwargs,
) -> list["Response"]:
r"""Get a list of responses of the chat model."""
...
@abstractmethod
async def stream_chat(
self,
messages: list[dict[str, str]],
system: Optional[str] = None,
tools: Optional[str] = None,
images: Optional[list["ImageInput"]] = None,
videos: Optional[list["VideoInput"]] = None,
audios: Optional[list["AudioInput"]] = None,
**input_kwargs,
) -> AsyncGenerator[str, None]:
r"""Get the response token-by-token of the chat model."""
...
@abstractmethod
async def get_scores(
self,
batch_input: list[str],
**input_kwargs,
) -> list[float]:
r"""Get a list of scores of the reward model."""
...
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