from typing import Any, Dict, List, Optional from langchain_core.embeddings import Embeddings from langchain_core.utils import pre_init from pydantic import BaseModel, ConfigDict from langchain_community.llms.sagemaker_endpoint import ContentHandlerBase class EmbeddingsContentHandler(ContentHandlerBase[List[str], List[List[float]]]): """Content handler for LLM class.""" class SagemakerEndpointEmbeddings(BaseModel, Embeddings): """Custom Sagemaker Inference Endpoints. To use, you must supply the endpoint name from your deployed Sagemaker model & the region where it is deployed. To authenticate, the AWS client uses the following methods to automatically load credentials: https://boto3.amazonaws.com/v1/documentation/api/latest/guide/credentials.html If a specific credential profile should be used, you must pass the name of the profile from the ~/.aws/credentials file that is to be used. Make sure the credentials / roles used have the required policies to access the Sagemaker endpoint. See: https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies.html """ """ Example: .. code-block:: python from langchain_community.embeddings import SagemakerEndpointEmbeddings endpoint_name = ( "my-endpoint-name" ) region_name = ( "us-west-2" ) credentials_profile_name = ( "default" ) se = SagemakerEndpointEmbeddings( endpoint_name=endpoint_name, region_name=region_name, credentials_profile_name=credentials_profile_name ) #Use with boto3 client client = boto3.client( "sagemaker-runtime", region_name=region_name ) se = SagemakerEndpointEmbeddings( endpoint_name=endpoint_name, client=client ) """ client: Any = None endpoint_name: str = "" """The name of the endpoint from the deployed Sagemaker model. Must be unique within an AWS Region.""" region_name: str = "" """The aws region where the Sagemaker model is deployed, eg. `us-west-2`.""" credentials_profile_name: Optional[str] = None """The name of the profile in the ~/.aws/credentials or ~/.aws/config files, which has either access keys or role information specified. If not specified, the default credential profile or, if on an EC2 instance, credentials from IMDS will be used. See: https://boto3.amazonaws.com/v1/documentation/api/latest/guide/credentials.html """ content_handler: EmbeddingsContentHandler """The content handler class that provides an input and output transform functions to handle formats between LLM and the endpoint. """ """ Example: .. code-block:: python from langchain_community.embeddings.sagemaker_endpoint import EmbeddingsContentHandler class ContentHandler(EmbeddingsContentHandler): content_type = "application/json" accepts = "application/json" def transform_input(self, prompts: List[str], model_kwargs: Dict) -> bytes: input_str = json.dumps({prompts: prompts, **model_kwargs}) return input_str.encode('utf-8') def transform_output(self, output: bytes) -> List[List[float]]: response_json = json.loads(output.read().decode("utf-8")) return response_json["vectors"] """ # noqa: E501 model_kwargs: Optional[Dict] = None """Keyword arguments to pass to the model.""" endpoint_kwargs: Optional[Dict] = None """Optional attributes passed to the invoke_endpoint function. See `boto3`_. docs for more info. .. _boto3: """ model_config = ConfigDict( arbitrary_types_allowed=True, extra="forbid", protected_namespaces=() ) @pre_init def validate_environment(cls, values: Dict) -> Dict: """Dont do anything if client provided externally""" if values.get("client") is not None: return values """Validate that AWS credentials to and python package exists in environment.""" try: import boto3 try: if values["credentials_profile_name"] is not None: session = boto3.Session( profile_name=values["credentials_profile_name"] ) else: # use default credentials session = boto3.Session() values["client"] = session.client( "sagemaker-runtime", region_name=values["region_name"] ) except Exception as e: raise ValueError( "Could not load credentials to authenticate with AWS client. " "Please check that credentials in the specified " f"profile name are valid. {e}" ) from e except ImportError: raise ImportError( "Could not import boto3 python package. " "Please install it with `pip install boto3`." ) return values def _embedding_func(self, texts: List[str]) -> List[List[float]]: """Call out to SageMaker Inference embedding endpoint.""" # replace newlines, which can negatively affect performance. texts = list(map(lambda x: x.replace("\n", " "), texts)) _model_kwargs = self.model_kwargs or {} _endpoint_kwargs = self.endpoint_kwargs or {} body = self.content_handler.transform_input(texts, _model_kwargs) content_type = self.content_handler.content_type accepts = self.content_handler.accepts # send request try: response = self.client.invoke_endpoint( EndpointName=self.endpoint_name, Body=body, ContentType=content_type, Accept=accepts, **_endpoint_kwargs, ) except Exception as e: raise ValueError(f"Error raised by inference endpoint: {e}") return self.content_handler.transform_output(response["Body"]) def embed_documents( self, texts: List[str], chunk_size: int = 64 ) -> List[List[float]]: """Compute doc embeddings using a SageMaker Inference Endpoint. Args: texts: The list of texts to embed. chunk_size: The chunk size defines how many input texts will be grouped together as request. If None, will use the chunk size specified by the class. Returns: List of embeddings, one for each text. """ results = [] _chunk_size = len(texts) if chunk_size > len(texts) else chunk_size for i in range(0, len(texts), _chunk_size): response = self._embedding_func(texts[i : i + _chunk_size]) results.extend(response) return results def embed_query(self, text: str) -> List[float]: """Compute query embeddings using a SageMaker inference endpoint. Args: text: The text to embed. Returns: Embeddings for the text. """ return self._embedding_func([text])[0]