instructor/docs/index.md

OpenAI Function Calls Quick Start Guide

Welcome to the quick start guide for OpenAI Function Call! This guide will walk you through the installation process and provide examples demonstrating the usage of function calls and schemas with OpenAI and Pydantic.

Installation

To get started with OpenAI Function Call, you need to install it using pip. Run the following command in your terminal:

pip install openai_function_call

Quick Start

This quick start guide contains the follow sections

1. Defining a schema
2. Adding Additional Prompting
3. Calling the ChatCompletion
4. deserializing back to the instance

OpenAI Function Call allows you to leverage OpenAI's powerful language models for function calls and schema extraction. This guide provides a quick start for using OpenAI Function Call.

Section 1: Defining a Schema

To begin, let's define a schema using OpenAI Function Call. A schema describes the structure of the input and output data for a function. In this example, we'll define a simple schema for a User object:

from openai_function_call import OpenAISchema

class UserDetails(OpenAISchema):
    name: str
    age: int

In this schema, we define a UserDetails class that extends OpenAISchema. We declare two fields, name and age, of type str and int respectively. It's important to note that since OpenAI models do not understand annotations or extra metadata like descriptions, we keep the definition clean without docstrings or field descriptions.

Section 2: Adding Additional Prompting

To enhance the performance of the OpenAI language model, you can add additional prompting in the form of docstrings and field descriptions. They can provide context and guide the model on how to process the data.

from openai_function_call import OpenAISchema
from pydantic import Field

class UserDetails(OpenAISchema):
    "Correctly extracted user information"
    name: str = Field(..., description="User's full name")
    age: int

In this updated schema, we use the Field class from pydantic to add descriptions to the name field. The description provides information about the field, giving even more context to the language model.

Section 3: Calling the ChatCompletion

With the schema defined, let's proceed with calling the ChatCompletion API using the defined schema and messages.

from openai_function_call import OpenAISchema
from pydantic import Field

class UserDetails(OpenAISchema):
    "Correctly extracted user information"
    name: str = Field(..., description="User's full name")
    age: int

completion = openai.ChatCompletion.create(
    model="gpt-3.5-turbo-0613",
    functions=[UserDetails.openai_schema],
    function_call={"name": UserDetails.openai_schema["name"]},
    messages=[
        {"role": "system", "content": "Extract user details from my requests"},
        {"role": "user", "content": "My name is John Doe and I'm 30 years old."},
    ],
)

In this example, we make a call to the ChatCompletion API by providing the model name (gpt-3.5-turbo-0613) and a list of messages. The messages consist of a system message and a user message. The system message sets the context by requesting user details, while the user message provides the input with the user's name and age.

Note that we have omitted the additional parameters that can be included in the API request, such as temperature, max_tokens, and n. These parameters can be customized according to your requirements.

Section 4: Deserializing Back to the Instance

To deserialize the response from the ChatCompletion API back into an instance of the UserDetails class, we can use the from_response method.

user = UserDetails.from_response(response)
print(user.name)  # Output: John Doe
print(user.age)   # Output: 30

By calling UserDetails.from_response, we create an instance of the UserDetails class using the response from the API call. Subsequently, we can access the extracted user details through the name and age attributes of the user object.

Next Steps

This quick start guide provided you with a basic understanding of how to use OpenAI Function Call for schema extraction and function calls. You can now explore more advanced use cases and creative applications of this library.

If you have any questions, feel free to leave an issue or reach out to the library's author on Twitter. For a more comprehensive solution with additional features, consider checking out MarvinAI.

To see more examples of how we can create interesting models check out some examples