# =========== Copyright 2023 @ 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 @ CAMEL-AI.org. All Rights Reserved. ===========
import os
from typing import Any, Dict, List, Optional
from anthropic import NOT_GIVEN, Anthropic
from camel.configs import ANTHROPIC_API_PARAMS
from camel.messages import OpenAIMessage
from camel.models.base_model import BaseModelBackend
from camel.types import ChatCompletion, ModelType
from camel.utils import (
AnthropicTokenCounter,
BaseTokenCounter,
api_keys_required,
)
[docs]
class AnthropicModel(BaseModelBackend):
r"""Anthropic API in a unified BaseModelBackend interface."""
def __init__(
self,
model_type: ModelType,
model_config_dict: Dict[str, Any],
api_key: Optional[str] = None,
url: Optional[str] = None,
token_counter: Optional[BaseTokenCounter] = None,
) -> None:
r"""Constructor for Anthropic backend.
Args:
model_type (ModelType): Model for which a backend is created,
one of CLAUDE_* series.
model_config_dict (Dict[str, Any]): A dictionary that will
be fed into Anthropic.messages.create().
api_key (Optional[str]): The API key for authenticating with the
Anthropic service. (default: :obj:`None`)
url (Optional[str]): The url to the Anthropic service. (default:
:obj:`None`)
token_counter (Optional[BaseTokenCounter]): Token counter to use
for the model. If not provided, `AnthropicTokenCounter` will
be used.
"""
super().__init__(
model_type, model_config_dict, api_key, url, token_counter
)
self._api_key = api_key or os.environ.get("ANTHROPIC_API_KEY")
self._url = url or os.environ.get("ANTHROPIC_API_BASE_URL")
self.client = Anthropic(api_key=self._api_key, base_url=self._url)
def _convert_response_from_anthropic_to_openai(self, response):
# openai ^1.0.0 format, reference openai/types/chat/chat_completion.py
obj = ChatCompletion.construct(
id=None,
choices=[
dict(
index=0,
message={
"role": "assistant",
"content": response.content[0].text,
},
finish_reason=response.stop_reason,
)
],
created=None,
model=response.model,
object="chat.completion",
)
return obj
@property
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.
"""
if not self._token_counter:
self._token_counter = AnthropicTokenCounter(self.model_type)
return self._token_counter
[docs]
def count_tokens_from_prompt(self, prompt: str) -> int:
r"""Count the number of tokens from a prompt.
Args:
prompt (str): The prompt string.
Returns:
int: The number of tokens in the prompt.
"""
return self.client.count_tokens(prompt)
[docs]
@api_keys_required("ANTHROPIC_API_KEY")
def run(
self,
messages: List[OpenAIMessage],
):
r"""Run inference of Anthropic chat completion.
Args:
messages (List[OpenAIMessage]): Message list with the chat history
in OpenAI API format.
Returns:
ChatCompletion: Response in the OpenAI API format.
"""
if messages[0]["role"] == "system":
sys_msg = str(messages.pop(0)["content"])
else:
sys_msg = NOT_GIVEN # type: ignore[assignment]
response = self.client.messages.create(
model=self.model_type.value,
system=sys_msg,
messages=messages, # type: ignore[arg-type]
**self.model_config_dict,
)
# format response to openai format
response = self._convert_response_from_anthropic_to_openai(response)
return response
[docs]
def check_model_config(self):
r"""Check whether the model configuration is valid for anthropic
model backends.
Raises:
ValueError: If the model configuration dictionary contains any
unexpected arguments to OpenAI API, or it does not contain
:obj:`model_path` or :obj:`server_url`.
"""
for param in self.model_config_dict:
if param not in ANTHROPIC_API_PARAMS:
raise ValueError(
f"Unexpected argument `{param}` is "
"input into Anthropic model backend."
)
@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 self.model_config_dict.get("stream", False)
