Return the response from the LLM

This sample demonstrates how to run a retrieval query to get a response from the LLM.

Explore further

For detailed documentation that includes this code sample, see the following:

• RAG Engine API
• Use a Weaviate database with RAG Engine
• Use Vertex AI Feature Store in RAG Engine
• Use Vertex AI Search as a retrieval backend using RAG Engine
• Use Vertex AI Vector Search with RAG Engine

Code sample

Python

Before trying this sample, follow the Python setup instructions in the Vertex AI quickstart using client libraries. For more information, see the Vertex AI Python API reference documentation.

To authenticate to Vertex AI, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

from vertexai.preview import rag
import vertexai

# TODO(developer): Update and un-comment below lines
# PROJECT_ID = "your-project-id"
# corpus_name = "projects/[PROJECT_ID]/locations/us-central1/ragCorpora/[rag_corpus_id]"

# Initialize Vertex AI API once per session
vertexai.init(project=PROJECT_ID, location="us-central1")

response = rag.retrieval_query(
    rag_resources=[
        rag.RagResource(
            rag_corpus=corpus_name,
            # Optional: supply IDs from `rag.list_files()`.
            # rag_file_ids=["rag-file-1", "rag-file-2", ...],
        )
    ],
    text="Hello World!",
    similarity_top_k=10,  # Optional
    vector_distance_threshold=0.5,  # Optional
)
print(response)
# Example response:
# contexts {
#   contexts {
#     source_uri: "gs://your-bucket-name/file.txt"
#     text: "....
#   ....

What's next

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