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Question Answering - OpenAI

In short

  • The OpenAI Question and Answer (Q&A) module is a Weaviate module for answer extraction from data through the OpenAI completions endpoint or the Azure OpenAI equivalent.
  • The module depends on a text vectorization module that should be running with Weaviate.
  • The module adds an ask {} operator to the GraphQL Get {} queries
  • The module returns a max. of 1 answer in the GraphQL _additional {} field.
  • The answer with the highest certainty (confidence level) will be returned.
  • Added in Weaviate v1.16.6
Azure OpenAI or OpenAI?

The module usage instructions may vary based on whether you are using OpenAI directly or Azure OpenAI. Please make sure that you are following the right instructions for your service provider.


For example, the following may vary:

  • Parameter names used in the schema, and
  • Names of the API key to be used.

Introduction

The Question and Answer (Q&A) OpenAI module is a Weaviate module for answer extraction from data. It uses an OpenAI completions endpoint to try and extract an answer from the most relevant docs.

This module can be used in GraphQL Get{...} queries, as a search operator. The qna-openai module tries to find an answer in the data objects of the specified class. If an answer is found within the given certainty range, it will be returned in the GraphQL _additional { answer { ... } } field. There will be a maximum of 1 answer returned, if this is above the optionally set certainty. The answer with the highest certainty (confidence level) will be returned.

Inference API key

qna-openai requires an API key from OpenAI or Azure OpenAI.

tip

You only need to provide one of the two keys, depending on which service (OpenAI or Azure OpenAI) you are using.

Organization name

Added in v1.21.1

For requests that require the OpenAI organization name, you can provide it at query time by adding it to the HTTP header:

  • "X-OpenAI-Organization": "YOUR-OPENAI-ORGANIZATION" for OpenAI

Providing the key to Weaviate

You can provide your API key in two ways:

  1. During the configuration of your Docker instance, by adding OPENAI_APIKEY or AZURE_APIKEY as appropriate under environment to your Docker Compose file, like this:

    environment:
    OPENAI_APIKEY: 'your-key-goes-here' # For use with OpenAI. Setting this parameter is optional; you can also provide the key at runtime.
    AZURE_APIKEY: 'your-key-goes-here' # For use with Azure OpenAI. Setting this parameter is optional; you can also provide the key at runtime.
    ...
  2. At run-time (recommended), by providing "X-OpenAI-Api-Key" or "X-Azure-Api-Key" through the request header. You can provide it using the Weaviate client, like this:

import weaviate

client = weaviate.Client(
url = "https://some-endpoint.weaviate.network/",
additional_headers = {
"X-OpenAI-Api-Key": "YOUR-OPENAI-API-KEY", # Replace with your API key
"X-Azure-Api-Key": "YOUR-AZURE-API-KEY", # Replace with your API key
}
)

Module configuration

Not applicable to WCS

This module is enabled and pre-configured on Weaviate Cloud Services.

Docker Compose file (Weaviate open source only)

You can enable the OpenAI Q&A module in your Docker Compose file (e.g. docker-compose.yml). Add the qna-openai module (alongside any other module you may need) to the ENABLE_MODULES property, like this:

ENABLE_MODULES: 'text2vec-openai,qna-openai'

Here is a full example of a Docker configuration, which uses the qna-openai module in combination with text2vec-openai:

---
version: '3.4'
services:
weaviate:
command:
- --host
- 0.0.0.0
- --port
- '8080'
- --scheme
- http
image:
cr.weaviate.io/semitechnologies/weaviate:1.24.8
ports:
- 8080:8080
- 50051:50051
restart: on-failure:0
environment:
QUERY_DEFAULTS_LIMIT: 25
AUTHENTICATION_ANONYMOUS_ACCESS_ENABLED: 'true'
PERSISTENCE_DATA_PATH: '/var/lib/weaviate'
DEFAULT_VECTORIZER_MODULE: 'text2vec-openai'
ENABLE_MODULES: 'text2vec-openai,qna-openai'
OPENAI_APIKEY: sk-foobar # For use with OpenAI. Setting this parameter is optional; you can also provide the key at runtime.
OPENAI_ORGANIZATION: your-orgname # For use with OpenAI. Setting this parameter is optional; you can also provide the key at runtime.
AZURE_APIKEY: sk-foobar # For use with Azure OpenAI. Setting this parameter is optional; you can also provide the key at runtime.
CLUSTER_HOSTNAME: 'node1'

Schema configuration

You can define settings for this module in the schema.

OpenAI vs Azure OpenAI

  • OpenAI users can optionally set the model parameter.
  • Azure OpenAI users must set the parameters resourceName and deploymentId.

Model parameters

You can also configure additional parameters for the model through the parameters shown below.

Example schema

For example, the following schema configuration will set Weaviate to use the qna-openai model with the Document class.

The following schema configuration uses the text-davinci-002 model.

{
"classes": [
{
"class": "Document",
"description": "A class called document",
"vectorizer": "text2vec-openai",
"moduleConfig": {
"qna-openai": {
"model": "text-davinci-002", // For OpenAI
"resourceName": "<YOUR-RESOURCE-NAME>", // For Azure OpenAI
"deploymentId": "<YOUR-MODEL-NAME>", // For Azure OpenAI
"maxTokens": 16, // Applicable to both OpenAI and Azure OpenAI
"temperature": 0.0, // Applicable to both OpenAI and Azure OpenAI
"topP": 1, // Applicable to both OpenAI and Azure OpenAI
"frequencyPenalty": 0.0, // Applicable to both OpenAI and Azure OpenAI
"presencePenalty": 0.0 // Applicable to both OpenAI and Azure OpenAI
}
},
"properties": [
{
"dataType": [
"text"
],
"description": "Content that will be vectorized",
"name": "content"
}
]
}
]
}

For information on how to use the individual parameters you can check here

How to use

This module adds a search operator to GraphQL Get{...} queries: ask{}. This operator takes the following arguments:

FieldData TypeRequiredExample valueDescription
questionstringyes"What is the name of the Dutch king?"The question to be answered.
propertieslist of stringsno["summary"]The properties of the queries Class which contains text. If no properties are set, all are considered.

Notes:

  • The GraphQL Explore { } function does support the ask searcher, but the result is only a beacon to the object containing the answer. It is thus not any different from performing a nearText semantic search with the question. No extraction is happening.
  • You cannot use the 'ask' operator along with a 'neaXXX' operator!

Example query

{
Get {
Article(
ask: {
question: "Who is Stanley Kubrick?",
properties: ["summary"]
},
limit: 1
) {
title
_additional {
answer {
hasAnswer
property
result
startPosition
endPosition
}
}
}
}
}

GraphQL response

The answer is contained in a new GraphQL _additional property called answer. It contains the following fields:

  • hasAnswer (boolean): could an answer be found?
  • result (nullable string): An answer if one could be found. null if hasAnswer==false
  • property (nullable string): The property which contains the answer. null if hasAnswer==false
  • startPosition (int): The character offset where the answer starts. 0 if hasAnswer==false
  • endPosition (int): The character offset where the answer ends 0 if hasAnswer==false

Note: startPosition, endPosition and property in the response are not guaranteed to be present. They are calculated by a case-insensitive string matching function against the input text. If the transformer model formats the output differently (e.g. by introducing spaces between tokens which were not present in the original input), the calculation of the position and determining the property fails.

Example response

{
"data": {
"Get": {
"Document": [
{
"_additional": {
"answer": {
"hasAnswer": true,
"result": " Stanley Kubrick is an American filmmaker who is best known for his films, including \"A Clockwork Orange,\" \"Eyes Wide Shut,\" and \"The Shining.\""
}
}
}
]
}
}
}

Token limits

If the number of input tokens exceed the limit of the model, the module will return the OpenAI API's error.

How it works (under the hood)

Under the hood, the model uses a two-step approach. First it performs a semantic search to find the documents (e.g. a Sentence, Paragraph, Article, etc.) most likely to contain the answer. In a second step, Weaviate creates the required prompt as an input to an external call made to the OpenAI Completions endpoint. Weaviate uses the most relevant documents to establish a prompt for which OpenAI extracts the answer. There are three possible outcomes:

  1. No answer was found because the question can not be answered,
  2. An answer was found, but did not meet the user-specified minimum certainty, so it was discarded (typically the case when the document is on topic, but does not contain an actual answer to the question), and
  3. An answer was found that matches the desired certainty. It is returned to the user.

The module performs a semantic search under the hood, so a text2vec-... module is required. It does not need to be of the same type as the qna-... module. For example, you can use a text2vec-contextionary module to perform the semantic search, and a qna-openai module to extract the answer.

Additional information

Available models

OpenAI has multiple models available for the extraction of answers from a given context.

These models can be configured

Questions and feedback

If you have any questions or feedback, please let us know on our forum. For example, you can: