mirror of
https://github.com/hwchase17/langchain
synced 2024-11-02 09:40:22 +00:00
500 lines
19 KiB
Python
500 lines
19 KiB
Python
import json
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import urllib.request
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import warnings
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from abc import abstractmethod
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from enum import Enum
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from typing import Any, Dict, List, Mapping, Optional
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from langchain_core.callbacks.manager import CallbackManagerForLLMRun
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from langchain_core.language_models.llms import BaseLLM
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from langchain_core.outputs import Generation, LLMResult
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from langchain_core.pydantic_v1 import BaseModel, SecretStr, root_validator, validator
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from langchain_core.utils import convert_to_secret_str, get_from_dict_or_env
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class AzureMLEndpointClient(object):
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"""AzureML Managed Endpoint client."""
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def __init__(
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self, endpoint_url: str, endpoint_api_key: str, deployment_name: str = ""
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) -> None:
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"""Initialize the class."""
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if not endpoint_api_key or not endpoint_url:
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raise ValueError(
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"""A key/token and REST endpoint should
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be provided to invoke the endpoint"""
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)
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self.endpoint_url = endpoint_url
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self.endpoint_api_key = endpoint_api_key
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self.deployment_name = deployment_name
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def call(
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self,
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body: bytes,
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run_manager: Optional[CallbackManagerForLLMRun] = None,
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**kwargs: Any,
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) -> bytes:
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"""call."""
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# The azureml-model-deployment header will force the request to go to a
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# specific deployment. Remove this header to have the request observe the
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# endpoint traffic rules.
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headers = {
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"Content-Type": "application/json",
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"Authorization": ("Bearer " + self.endpoint_api_key),
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}
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if self.deployment_name != "":
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headers["azureml-model-deployment"] = self.deployment_name
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req = urllib.request.Request(self.endpoint_url, body, headers)
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response = urllib.request.urlopen(req, timeout=kwargs.get("timeout", 50))
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result = response.read()
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return result
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class AzureMLEndpointApiType(str, Enum):
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"""Azure ML endpoints API types. Use `realtime` for models deployed in hosted
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infrastructure, or `serverless` for models deployed as a service with a
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pay-as-you-go billing or PTU.
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"""
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realtime = "realtime"
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serverless = "serverless"
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class ContentFormatterBase:
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"""Transform request and response of AzureML endpoint to match with
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required schema.
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"""
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"""
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Example:
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.. code-block:: python
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class ContentFormatter(ContentFormatterBase):
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content_type = "application/json"
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accepts = "application/json"
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def format_request_payload(
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self,
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prompt: str,
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model_kwargs: Dict,
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api_type: AzureMLEndpointApiType,
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) -> bytes:
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input_str = json.dumps(
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{
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"inputs": {"input_string": [prompt]},
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"parameters": model_kwargs,
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}
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)
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return str.encode(input_str)
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def format_response_payload(
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self, output: str, api_type: AzureMLEndpointApiType
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) -> str:
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response_json = json.loads(output)
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return response_json[0]["0"]
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"""
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content_type: Optional[str] = "application/json"
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"""The MIME type of the input data passed to the endpoint"""
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accepts: Optional[str] = "application/json"
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"""The MIME type of the response data returned from the endpoint"""
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format_error_msg: str = (
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"Error while formatting response payload for chat model of type "
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" `{api_type}`. Are you using the right formatter for the deployed "
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" model and endpoint type?"
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)
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@staticmethod
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def escape_special_characters(prompt: str) -> str:
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"""Escapes any special characters in `prompt`"""
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escape_map = {
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"\\": "\\\\",
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'"': '\\"',
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"\b": "\\b",
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"\f": "\\f",
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"\n": "\\n",
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"\r": "\\r",
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"\t": "\\t",
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}
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# Replace each occurrence of the specified characters with escaped versions
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for escape_sequence, escaped_sequence in escape_map.items():
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prompt = prompt.replace(escape_sequence, escaped_sequence)
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return prompt
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@property
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def supported_api_types(self) -> List[AzureMLEndpointApiType]:
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"""Supported APIs for the given formatter. Azure ML supports
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deploying models using different hosting methods. Each method may have
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a different API structure."""
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return [AzureMLEndpointApiType.realtime]
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def format_request_payload(
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self,
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prompt: str,
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model_kwargs: Dict,
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api_type: AzureMLEndpointApiType = AzureMLEndpointApiType.realtime,
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) -> Any:
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"""Formats the request body according to the input schema of
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the model. Returns bytes or seekable file like object in the
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format specified in the content_type request header.
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"""
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raise NotImplementedError()
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@abstractmethod
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def format_response_payload(
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self,
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output: bytes,
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api_type: AzureMLEndpointApiType = AzureMLEndpointApiType.realtime,
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) -> Generation:
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"""Formats the response body according to the output
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schema of the model. Returns the data type that is
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received from the response.
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"""
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class GPT2ContentFormatter(ContentFormatterBase):
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"""Content handler for GPT2"""
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@property
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def supported_api_types(self) -> List[AzureMLEndpointApiType]:
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return [AzureMLEndpointApiType.realtime]
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def format_request_payload( # type: ignore[override]
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self, prompt: str, model_kwargs: Dict, api_type: AzureMLEndpointApiType
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) -> bytes:
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prompt = ContentFormatterBase.escape_special_characters(prompt)
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request_payload = json.dumps(
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{"inputs": {"input_string": [f'"{prompt}"']}, "parameters": model_kwargs}
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)
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return str.encode(request_payload)
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def format_response_payload( # type: ignore[override]
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self, output: bytes, api_type: AzureMLEndpointApiType
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) -> Generation:
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try:
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choice = json.loads(output)[0]["0"]
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except (KeyError, IndexError, TypeError) as e:
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raise ValueError(self.format_error_msg.format(api_type=api_type)) from e # type: ignore[union-attr]
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return Generation(text=choice)
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class OSSContentFormatter(GPT2ContentFormatter):
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"""Deprecated: Kept for backwards compatibility
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Content handler for LLMs from the OSS catalog."""
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content_formatter: Any = None
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def __init__(self) -> None:
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super().__init__()
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warnings.warn(
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"""`OSSContentFormatter` will be deprecated in the future.
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Please use `GPT2ContentFormatter` instead.
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"""
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)
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class HFContentFormatter(ContentFormatterBase):
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"""Content handler for LLMs from the HuggingFace catalog."""
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@property
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def supported_api_types(self) -> List[AzureMLEndpointApiType]:
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return [AzureMLEndpointApiType.realtime]
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def format_request_payload( # type: ignore[override]
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self, prompt: str, model_kwargs: Dict, api_type: AzureMLEndpointApiType
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) -> bytes:
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ContentFormatterBase.escape_special_characters(prompt)
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request_payload = json.dumps(
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{"inputs": [f'"{prompt}"'], "parameters": model_kwargs}
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)
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return str.encode(request_payload)
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def format_response_payload( # type: ignore[override]
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self, output: bytes, api_type: AzureMLEndpointApiType
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) -> Generation:
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try:
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choice = json.loads(output)[0]["0"]["generated_text"]
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except (KeyError, IndexError, TypeError) as e:
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raise ValueError(self.format_error_msg.format(api_type=api_type)) from e # type: ignore[union-attr]
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return Generation(text=choice)
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class DollyContentFormatter(ContentFormatterBase):
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"""Content handler for the Dolly-v2-12b model"""
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@property
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def supported_api_types(self) -> List[AzureMLEndpointApiType]:
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return [AzureMLEndpointApiType.realtime]
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def format_request_payload( # type: ignore[override]
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self, prompt: str, model_kwargs: Dict, api_type: AzureMLEndpointApiType
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) -> bytes:
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prompt = ContentFormatterBase.escape_special_characters(prompt)
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request_payload = json.dumps(
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{
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"input_data": {"input_string": [f'"{prompt}"']},
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"parameters": model_kwargs,
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}
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)
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return str.encode(request_payload)
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def format_response_payload( # type: ignore[override]
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self, output: bytes, api_type: AzureMLEndpointApiType
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) -> Generation:
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try:
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choice = json.loads(output)[0]
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except (KeyError, IndexError, TypeError) as e:
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raise ValueError(self.format_error_msg.format(api_type=api_type)) from e # type: ignore[union-attr]
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return Generation(text=choice)
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class LlamaContentFormatter(ContentFormatterBase):
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"""Content formatter for LLaMa"""
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@property
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def supported_api_types(self) -> List[AzureMLEndpointApiType]:
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return [AzureMLEndpointApiType.realtime, AzureMLEndpointApiType.serverless]
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def format_request_payload( # type: ignore[override]
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self, prompt: str, model_kwargs: Dict, api_type: AzureMLEndpointApiType
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) -> bytes:
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"""Formats the request according to the chosen api"""
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prompt = ContentFormatterBase.escape_special_characters(prompt)
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if api_type == AzureMLEndpointApiType.realtime:
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request_payload = json.dumps(
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{
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"input_data": {
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"input_string": [f'"{prompt}"'],
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"parameters": model_kwargs,
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}
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}
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)
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elif api_type == AzureMLEndpointApiType.serverless:
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request_payload = json.dumps({"prompt": prompt, **model_kwargs})
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else:
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raise ValueError(
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f"`api_type` {api_type} is not supported by this formatter"
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)
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return str.encode(request_payload)
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def format_response_payload( # type: ignore[override]
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self, output: bytes, api_type: AzureMLEndpointApiType
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) -> Generation:
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"""Formats response"""
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if api_type == AzureMLEndpointApiType.realtime:
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try:
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choice = json.loads(output)[0]["0"]
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except (KeyError, IndexError, TypeError) as e:
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raise ValueError(self.format_error_msg.format(api_type=api_type)) from e # type: ignore[union-attr]
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return Generation(text=choice)
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if api_type == AzureMLEndpointApiType.serverless:
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try:
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choice = json.loads(output)["choices"][0]
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if not isinstance(choice, dict):
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raise TypeError(
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"Endpoint response is not well formed for a chat "
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"model. Expected `dict` but `{type(choice)}` was "
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"received."
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)
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except (KeyError, IndexError, TypeError) as e:
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raise ValueError(self.format_error_msg.format(api_type=api_type)) from e # type: ignore[union-attr]
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return Generation(
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text=choice["text"].strip(),
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generation_info=dict(
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finish_reason=choice.get("finish_reason"),
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logprobs=choice.get("logprobs"),
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),
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)
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raise ValueError(f"`api_type` {api_type} is not supported by this formatter")
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class AzureMLBaseEndpoint(BaseModel):
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"""Azure ML Online Endpoint models."""
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endpoint_url: str = ""
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"""URL of pre-existing Endpoint. Should be passed to constructor or specified as
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env var `AZUREML_ENDPOINT_URL`."""
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endpoint_api_type: AzureMLEndpointApiType = AzureMLEndpointApiType.realtime
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"""Type of the endpoint being consumed. Possible values are `serverless` for
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pay-as-you-go and `realtime` for real-time endpoints. """
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endpoint_api_key: SecretStr = convert_to_secret_str("")
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"""Authentication Key for Endpoint. Should be passed to constructor or specified as
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env var `AZUREML_ENDPOINT_API_KEY`."""
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deployment_name: str = ""
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"""Deployment Name for Endpoint. NOT REQUIRED to call endpoint. Should be passed
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to constructor or specified as env var `AZUREML_DEPLOYMENT_NAME`."""
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http_client: Any = None #: :meta private:
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content_formatter: Any = None
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"""The content formatter that provides an input and output
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transform function to handle formats between the LLM and
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the endpoint"""
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model_kwargs: Optional[dict] = None
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"""Keyword arguments to pass to the model."""
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@root_validator(pre=True)
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def validate_environ(cls, values: Dict) -> Dict:
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values["endpoint_api_key"] = convert_to_secret_str(
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get_from_dict_or_env(values, "endpoint_api_key", "AZUREML_ENDPOINT_API_KEY")
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)
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values["endpoint_url"] = get_from_dict_or_env(
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values, "endpoint_url", "AZUREML_ENDPOINT_URL"
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)
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values["deployment_name"] = get_from_dict_or_env(
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values, "deployment_name", "AZUREML_DEPLOYMENT_NAME", ""
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)
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values["endpoint_api_type"] = get_from_dict_or_env(
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values,
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"endpoint_api_type",
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"AZUREML_ENDPOINT_API_TYPE",
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AzureMLEndpointApiType.realtime,
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)
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return values
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@validator("content_formatter")
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def validate_content_formatter(
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cls, field_value: Any, values: Dict
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) -> ContentFormatterBase:
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"""Validate that content formatter is supported by endpoint type."""
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endpoint_api_type = values.get("endpoint_api_type")
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if endpoint_api_type not in field_value.supported_api_types:
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raise ValueError(
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f"Content formatter f{type(field_value)} is not supported by this "
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f"endpoint. Supported types are {field_value.supported_api_types} "
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f"but endpoint is {endpoint_api_type}."
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)
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return field_value
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@validator("endpoint_url")
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def validate_endpoint_url(cls, field_value: Any) -> str:
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"""Validate that endpoint url is complete."""
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if field_value.endswith("/"):
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field_value = field_value[:-1]
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if field_value.endswith("inference.ml.azure.com"):
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raise ValueError(
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"`endpoint_url` should contain the full invocation URL including "
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"`/score` for `endpoint_api_type='realtime'` or `/v1/completions` "
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"or `/v1/chat/completions` for `endpoint_api_type='serverless'`"
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)
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return field_value
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@validator("endpoint_api_type")
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def validate_endpoint_api_type(
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cls, field_value: Any, values: Dict
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) -> AzureMLEndpointApiType:
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"""Validate that endpoint api type is compatible with the URL format."""
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endpoint_url = values.get("endpoint_url")
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if field_value == AzureMLEndpointApiType.realtime and not endpoint_url.endswith( # type: ignore[union-attr]
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"/score"
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):
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raise ValueError(
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"Endpoints of type `realtime` should follow the format "
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"`https://<your-endpoint>.<your_region>.inference.ml.azure.com/score`."
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" If your endpoint URL ends with `/v1/completions` or"
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"`/v1/chat/completions`, use `endpoint_api_type='serverless'` instead."
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)
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if field_value == AzureMLEndpointApiType.serverless and not (
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endpoint_url.endswith("/v1/completions") # type: ignore[union-attr]
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or endpoint_url.endswith("/v1/chat/completions") # type: ignore[union-attr]
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):
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raise ValueError(
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"Endpoints of type `serverless` should follow the format "
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"`https://<your-endpoint>.<your_region>.inference.ml.azure.com/v1/chat/completions`"
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" or `https://<your-endpoint>.<your_region>.inference.ml.azure.com/v1/chat/completions`"
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)
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return field_value
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@validator("http_client", always=True)
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def validate_client(cls, field_value: Any, values: Dict) -> AzureMLEndpointClient:
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"""Validate that api key and python package exists in environment."""
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endpoint_url = values.get("endpoint_url")
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endpoint_key = values.get("endpoint_api_key")
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deployment_name = values.get("deployment_name")
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http_client = AzureMLEndpointClient(
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endpoint_url, # type: ignore
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endpoint_key.get_secret_value(), # type: ignore
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deployment_name, # type: ignore
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)
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return http_client
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class AzureMLOnlineEndpoint(BaseLLM, AzureMLBaseEndpoint):
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"""Azure ML Online Endpoint models.
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Example:
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.. code-block:: python
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azure_llm = AzureMLOnlineEndpoint(
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endpoint_url="https://<your-endpoint>.<your_region>.inference.ml.azure.com/score",
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endpoint_api_type=AzureMLApiType.realtime,
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endpoint_api_key="my-api-key",
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content_formatter=content_formatter,
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)
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""" # noqa: E501
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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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_model_kwargs = self.model_kwargs or {}
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return {
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**{"deployment_name": self.deployment_name},
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**{"model_kwargs": _model_kwargs},
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}
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@property
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def _llm_type(self) -> str:
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"""Return type of llm."""
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return "azureml_endpoint"
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def _generate(
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self,
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prompts: List[str],
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stop: Optional[List[str]] = None,
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run_manager: Optional[CallbackManagerForLLMRun] = None,
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**kwargs: Any,
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) -> LLMResult:
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"""Run the LLM on the given prompts.
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Args:
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prompts: The prompt to pass into the model.
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stop: Optional list of stop words to use when generating.
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Returns:
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The string generated by the model.
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Example:
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.. code-block:: python
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response = azureml_model("Tell me a joke.")
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"""
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_model_kwargs = self.model_kwargs or {}
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_model_kwargs.update(kwargs)
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if stop:
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_model_kwargs["stop"] = stop
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generations = []
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for prompt in prompts:
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request_payload = self.content_formatter.format_request_payload(
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prompt, _model_kwargs, self.endpoint_api_type
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)
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response_payload = self.http_client.call(
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body=request_payload, run_manager=run_manager
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)
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generated_text = self.content_formatter.format_response_payload(
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response_payload, self.endpoint_api_type
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)
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generations.append([generated_text])
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return LLMResult(generations=generations)
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