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You're viewing version 2.12 of the OpenSearch documentation. This version is no longer maintained. For the latest version, see the current documentation. For information about OpenSearch version maintenance, see Release Schedule and Maintenance Policy.

ML Model tool

Introduced 2.12

This is an experimental feature and is not recommended for use in a production environment. For updates on the progress of the feature or if you want to leave feedback, see the associated GitHub issue.

The MLModelTool runs a machine learning (ML) model and returns inference results.

Step 1: Create a connector for a model

The following example request creates a connector for a model hosted on Amazon SageMaker:

POST /_plugins/_ml/connectors/_create
{
  "name": "sagemaker model",
  "description": "Test connector for Sagemaker model",
  "version": 1,
  "protocol": "aws_sigv4",
  "credential": {
    "access_key": "<YOUR ACCESS KEY>",
    "secret_key": "<YOUR SECRET KEY>"
  },
  "parameters": {
    "region": "us-east-1",
    "service_name": "sagemaker"
  },
  "actions": [
    {
      "action_type": "predict",
      "method": "POST",
      "headers": {
        "content-type": "application/json"
      },
      "url": "<YOUR SAGEMAKER ENDPOINT>",
      "request_body": """{"prompt":"${parameters.prompt}"}"""
    }
  ]
}

OpenSearch responds with a connector ID:

{
  "connector_id": "eJATWo0BkIylWTeYToTn"
}

Step 2: Register and deploy the model

To register and deploy the model to OpenSearch, send the following request, providing the connector ID from the previous step:

POST /_plugins/_ml/models/_register?deploy=true
{
  "name": "remote-inferene",
  "function_name": "remote",
  "description": "test model",
  "connector_id": "eJATWo0BkIylWTeYToTn"
}

OpenSearch responds with a model ID:

{
  "task_id": "7X7pWI0Bpc3sThaJ4I8R",
  "status": "CREATED",
  "model_id": "h5AUWo0BkIylWTeYT4SU"
}

Step 3: Register a flow agent that will run the MLModelTool

A flow agent runs a sequence of tools in order and returns the last tool’s output. To create a flow agent, send the following register agent request, providing the model ID in the model_id parameter:

POST /_plugins/_ml/agents/_register
{
  "name": "Test agent for embedding model",
  "type": "flow",
  "description": "this is a test agent",
  "tools": [
    {
      "type": "MLModelTool",
      "description": "A general tool to answer any question",
      "parameters": {
        "model_id": "h5AUWo0BkIylWTeYT4SU",
        "prompt": "\n\nHuman:You are a professional data analyst. You will always answer question based on the given context first. If the answer is not directly shown in the context, you will analyze the data and find the answer. If you don't know the answer, just say don't know. \n\nHuman:${parameters.question}\n\nAssistant:"
      }
    }
  ]
}

For parameter descriptions, see Register parameters.

OpenSearch responds with an agent ID:

{
  "agent_id": "9X7xWI0Bpc3sThaJdY9i"
}

Step 4: Run the agent

Run the agent by sending the following request:

POST /_plugins/_ml/agents/9X7xWI0Bpc3sThaJdY9i/_execute
{
  "parameters": {
    "question": "what's the population increase of Seattle from 2021 to 2023"
  }
}

OpenSearch returns the inference results:

{
  "inference_results": [
    {
      "output": [
        {
          "name": "response",
          "result": " I do not have direct data on the population increase of Seattle from 2021 to 2023 in the context provided. As a data analyst, I would need to research population statistics from credible sources like the US Census Bureau to analyze population trends and make an informed estimate. Without looking up actual data, I don't have enough information to provide a specific answer to the question."
        }
      ]
    }
  ]
}

Register parameters

The following table lists all tool parameters that are available when registering an agent.

Parameter Type Required/Optional Description
model_id String Required The model ID of the large language model (LLM) to use for generating the response.
prompt String Optional The prompt to provide to the LLM.
response_field String Optional The name of the response field. Default is response.

Execute parameters

The following table lists all tool parameters that are available when running the agent.

Parameter Type Required/Optional Description
question String Required The natural language question to send to the LLM.
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