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# ========= Copyright 2023-2024 @ CAMEL-AI.org. 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.
# ========= Copyright 2023-2024 @ CAMEL-AI.org. All Rights Reserved. =========
from abc import ABC, abstractmethod
from typing import Any, Dict, List, Optional, Union
from openai import Stream
from camel.messages import OpenAIMessage
from camel.types import (
ChatCompletion,
ChatCompletionChunk,
ModelType,
UnifiedModelType,
)
from camel.utils import BaseTokenCounter
class BaseModelBackend(ABC):
r"""Base class for different model backends.
It may be OpenAI API, a local LLM, a stub for unit tests, etc.
Args:
model_type (Union[ModelType, str]): Model for which a backend is
created.
model_config_dict (Optional[Dict[str, Any]], optional): A config
dictionary. (default: :obj:`{}`)
api_key (Optional[str], optional): The API key for authenticating
with the model service. (default: :obj:`None`)
url (Optional[str], optional): The url to the model service.
(default: :obj:`None`)
token_counter (Optional[BaseTokenCounter], optional): Token
counter to use for the model. If not provided,
:obj:`OpenAITokenCounter` will be used. (default: :obj:`None`)
"""
def __init__(
self,
model_type: Union[ModelType, str],
model_config_dict: Optional[Dict[str, Any]] = None,
api_key: Optional[str] = None,
url: Optional[str] = None,
token_counter: Optional[BaseTokenCounter] = None,
) -> None:
self.model_type: UnifiedModelType = UnifiedModelType(model_type)
if model_config_dict is None:
model_config_dict = {}
self.model_config_dict = model_config_dict
self._api_key = api_key
self._url = url
self._token_counter = token_counter
self.check_model_config()
@property
@abstractmethod
def token_counter(self) -> BaseTokenCounter:
r"""Initialize the token counter for the model backend.
Returns:
BaseTokenCounter: The token counter following the model's
tokenization style.
"""
pass
@abstractmethod
def run(
self,
messages: List[OpenAIMessage],
) -> Union[ChatCompletion, Stream[ChatCompletionChunk]]:
r"""Runs the query to the backend model.
Args:
messages (List[OpenAIMessage]): Message list with the chat history
in OpenAI API format.
Returns:
Union[ChatCompletion, Stream[ChatCompletionChunk]]:
`ChatCompletion` in the non-stream mode, or
`Stream[ChatCompletionChunk]` in the stream mode.
"""
pass
@abstractmethod
def check_model_config(self):
r"""Check whether the input model configuration contains unexpected
arguments
Raises:
ValueError: If the model configuration dictionary contains any
unexpected argument for this model class.
"""
pass
def count_tokens_from_messages(self, messages: List[OpenAIMessage]) -> int:
r"""Count the number of tokens in the messages using the specific
tokenizer.
Args:
messages (List[Dict]): message list with the chat history
in OpenAI API format.
Returns:
int: Number of tokens in the messages.
"""
return self.token_counter.count_tokens_from_messages(messages)
@property
def token_limit(self) -> int:
r"""Returns the maximum token limit for a given model.
This method retrieves the maximum token limit either from the
`model_config_dict` or from the model's default token limit.
Returns:
int: The maximum token limit for the given model.
"""
return (
self.model_config_dict.get("max_tokens")
or self.model_type.token_limit
)
@property
def stream(self) -> bool:
r"""Returns whether the model is in stream mode, which sends partial
results each time.
Returns:
bool: Whether the model is in stream mode.
"""
return False
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