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165 lines
5.8 KiB
Python
165 lines
5.8 KiB
Python
"""Wrapper around MosaicML APIs."""
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from typing import Any, Dict, List, Mapping, Optional, Tuple
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import requests
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from pydantic import BaseModel, Extra, root_validator
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from langchain.embeddings.base import Embeddings
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from langchain.utils import get_from_dict_or_env
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class MosaicMLInstructorEmbeddings(BaseModel, Embeddings):
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"""Wrapper around MosaicML's embedding inference service.
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To use, you should have the
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environment variable ``MOSAICML_API_TOKEN`` set with your API token, or pass
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it as a named parameter to the constructor.
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Example:
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.. code-block:: python
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from langchain.llms import MosaicMLInstructorEmbeddings
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endpoint_url = (
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"https://models.hosted-on.mosaicml.hosting/instructor-large/v1/predict"
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)
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mosaic_llm = MosaicMLInstructorEmbeddings(
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endpoint_url=endpoint_url,
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mosaicml_api_token="my-api-key"
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)
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"""
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endpoint_url: str = (
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"https://models.hosted-on.mosaicml.hosting/instructor-xl/v1/predict"
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)
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"""Endpoint URL to use."""
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embed_instruction: str = "Represent the document for retrieval: "
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"""Instruction used to embed documents."""
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query_instruction: str = (
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"Represent the question for retrieving supporting documents: "
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)
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"""Instruction used to embed the query."""
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retry_sleep: float = 1.0
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"""How long to try sleeping for if a rate limit is encountered"""
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mosaicml_api_token: Optional[str] = None
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class Config:
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"""Configuration for this pydantic object."""
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extra = Extra.forbid
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@root_validator()
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def validate_environment(cls, values: Dict) -> Dict:
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"""Validate that api key and python package exists in environment."""
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mosaicml_api_token = get_from_dict_or_env(
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values, "mosaicml_api_token", "MOSAICML_API_TOKEN"
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)
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values["mosaicml_api_token"] = mosaicml_api_token
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return values
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@property
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def _identifying_params(self) -> Mapping[str, Any]:
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"""Get the identifying parameters."""
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return {"endpoint_url": self.endpoint_url}
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def _embed(
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self, input: List[Tuple[str, str]], is_retry: bool = False
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) -> List[List[float]]:
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payload = {"input_strings": input}
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# HTTP headers for authorization
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headers = {
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"Authorization": f"{self.mosaicml_api_token}",
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"Content-Type": "application/json",
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}
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# send request
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try:
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response = requests.post(self.endpoint_url, headers=headers, json=payload)
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except requests.exceptions.RequestException as e:
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raise ValueError(f"Error raised by inference endpoint: {e}")
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try:
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parsed_response = response.json()
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if "error" in parsed_response:
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# if we get rate limited, try sleeping for 1 second
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if (
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not is_retry
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and "rate limit exceeded" in parsed_response["error"].lower()
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):
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import time
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time.sleep(self.retry_sleep)
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return self._embed(input, is_retry=True)
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raise ValueError(
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f"Error raised by inference API: {parsed_response['error']}"
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)
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# The inference API has changed a couple of times, so we add some handling
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# to be robust to multiple response formats.
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if isinstance(parsed_response, dict):
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if "data" in parsed_response:
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output_item = parsed_response["data"]
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elif "output" in parsed_response:
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output_item = parsed_response["output"]
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else:
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raise ValueError(
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f"No key data or output in response: {parsed_response}"
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)
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if isinstance(output_item, list) and isinstance(output_item[0], list):
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embeddings = output_item
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else:
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embeddings = [output_item]
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elif isinstance(parsed_response, list):
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first_item = parsed_response[0]
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if isinstance(first_item, list):
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embeddings = parsed_response
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elif isinstance(first_item, dict):
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if "output" in first_item:
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embeddings = [item["output"] for item in parsed_response]
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else:
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raise ValueError(
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f"No key data or output in response: {parsed_response}"
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)
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else:
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raise ValueError(f"Unexpected response format: {parsed_response}")
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else:
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raise ValueError(f"Unexpected response type: {parsed_response}")
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except requests.exceptions.JSONDecodeError as e:
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raise ValueError(
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f"Error raised by inference API: {e}.\nResponse: {response.text}"
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)
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return embeddings
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def embed_documents(self, texts: List[str]) -> List[List[float]]:
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"""Embed documents using a MosaicML deployed instructor embedding model.
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Args:
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texts: The list of texts to embed.
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Returns:
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List of embeddings, one for each text.
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"""
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instruction_pairs = [(self.embed_instruction, text) for text in texts]
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embeddings = self._embed(instruction_pairs)
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return embeddings
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def embed_query(self, text: str) -> List[float]:
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"""Embed a query using a MosaicML deployed instructor embedding model.
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Args:
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text: The text to embed.
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Returns:
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Embeddings for the text.
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"""
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instruction_pair = (self.query_instruction, text)
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embedding = self._embed([instruction_pair])[0]
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return embedding
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