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This template is an application that utilizes Google Vertex AI Search, a machine learning powered search service, and PaLM 2 for Chat (chat-bison). The application uses a Retrieval chain to answer questions based on your documents.

This template is an application that utilizes Google Sensitive Data Protection, a service for detecting and redacting sensitive data in text, and PaLM 2 for Chat (chat-bison), although you can use any model.

For more context on using Sensitive Data Protection, check here.

Environment Setup​

Before using this template, please ensure that you enable the DLP API and Vertex AI API in your Google Cloud project.

For some common environment troubleshooting steps related to Google Cloud, see the bottom of this readme.

Set the following environment variables:

  • GOOGLE_CLOUD_PROJECT_ID - Your Google Cloud project ID.
  • MODEL_TYPE - The model type for Vertex AI Search (e.g. chat-bison)


To use this package, you should first have the LangChain CLI installed:

pip install -U langchain-cli

To create a new LangChain project and install this as the only package, you can do:

langchain app new my-app --package rag-google-cloud-sensitive-data-protection

If you want to add this to an existing project, you can just run:

langchain app add rag-google-cloud-sensitive-data-protection

And add the following code to your file:

from rag_google_cloud_sensitive_data_protection.chain import chain as rag_google_cloud_sensitive_data_protection_chain

add_routes(app, rag_google_cloud_sensitive_data_protection_chain, path="/rag-google-cloud-sensitive-data-protection")

(Optional) Let's now configure LangSmith. LangSmith will help us trace, monitor and debug LangChain applications. You can sign up for LangSmith here. If you don't have access, you can skip this section

export LANGCHAIN_API_KEY=<your-api-key>
export LANGCHAIN_PROJECT=<your-project> # if not specified, defaults to "default"

If you are inside this directory, then you can spin up a LangServe instance directly by:

langchain serve

This will start the FastAPI app with a server running locally at http://localhost:8000

We can see all templates at We can access the playground at

We can access the template from code with:

from langserve.client import RemoteRunnable

runnable = RemoteRunnable("http://localhost:8000/rag-google-cloud-sensitive-data-protection")

# Troubleshooting Google Cloud

You can set your `gcloud` credentials with their CLI using `gcloud auth application-default login`

You can set your `gcloud` project with the following commands
gcloud config set project <your project>
gcloud auth application-default set-quota-project <your project>
export GOOGLE_CLOUD_PROJECT_ID=<your project>

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