Hugging Face
让我们加载 Hugging Face Embedding 类。
%pip install --upgrade --quiet langchain sentence_transformers
from langchain_huggingface.embeddings import HuggingFaceEmbeddings
API 参考：HuggingFaceEmbeddings
embeddings = HuggingFaceEmbeddings(model_name="sentence-transformers/all-mpnet-base-v2")
text = "This is a test document."
query_result = embeddings.embed_query(text)
query_result[:3]
[-0.04895168915390968, -0.03986193612217903, -0.021562768146395683]
doc_result = embeddings.embed_documents([text])
Hugging Face 推理 API
我们还可以通过 Hugging Face 推理 API 访问嵌入模型，这不需要我们安装 sentence_transformers 并本地下载模型。
import getpass
inference_api_key = getpass.getpass("Enter your HF Inference API Key:\n\n")
Enter your HF Inference API Key:
········
from langchain_community.embeddings import HuggingFaceInferenceAPIEmbeddings
embeddings = HuggingFaceInferenceAPIEmbeddings(
api_key=inference_api_key, model_name="sentence-transformers/all-MiniLM-l6-v2"
)
query_result = embeddings.embed_query(text)
query_result[:3]
[-0.038338541984558105, 0.1234646737575531, -0.028642963618040085]
Hugging Face Hub
我们还可以通过 Hugging Face Hub 包在本地生成嵌入，这需要我们安装 huggingface_hub
!pip install huggingface_hub
from langchain_huggingface.embeddings import HuggingFaceEndpointEmbeddings
embeddings = HuggingFaceEndpointEmbeddings()
text = "This is a test document."
query_result = embeddings.embed_query(text)
query_result[:3]