Linq.AI.OpenAI 1.2.3

Linq.AI.OpenAI

This library adds Linq extension methods using OpenAI structured outputs.

This library was heaviy inspired by stevenic's agentm-js library, Kudos!

Installation

dotnet add package Linq.AI.OpenAI

Architecture

For each element in a collection an model API call is made to evaluate and return the result. These are done in parallel on background threads.

OpenAI model

To use these methods you will need to instantiate a ChatClient model like this:

var model = new ChatClient(model: "gpt-4o-mini", "<modelKey>");

NOTE: The model must support structured output.

Object Extensions

These extensions use an OpenAI model to work with text.

Object .Classify()

enum Genres { Rock, Pop, Electronica, Country, Classical };
var classification = item.Classify<Genres>(model);

item.Summarize()

var summary = item.Summarize(model, "with 3 words");

item.Matches()

if (item.Matches(model, "there is date"))
  ...

item.Answer()

var summary = text.Answer(model, "what is the birthday?");

item.Select()

Select pulls a collection of items from the source.

Example using model to select

var words = text.Select<string>(model, "The second word of every paragraph");

Example using model to select structed data.

public class HREF 
{ 
	public string Url {get;set;}
	public string Title {get;set;}
}
var summary = text.Select<HREF>(model);

Linq Extensions

These collection extensions use an OpenAI model to work with collections using Linq style methods.

NOTE: These methods internally run AI calls as throttled parallel background tasks.

enumerable.Classify()

This allows you to classify each item using a model;

enum Genres { Rock, Pop, Electronica, Country, Classical };
var classifiedItems = items.Classify<Genres>(model);

enumerable.Where()/enumerable.Remove()

Filter a collection using natural language

var breadboxItems = items.Where(model, "item would fit in a bread box");
var bigItems = items.Remove(model, "item would fit in a bread box");

enumerable.Select()

.Select() let's you transform the source into target using an OpenAI model.

You can use it to transform an object from one format to another by simply giving the types. It will use model to do the transformation.

var targetItems = items.Select<SourceItem,TargetItem>(model)

You can use it to transform a collection of text

var markdownItems = items.Select(model, "transform each item into markdown like this:\n# {{TITLE}}\n{{AUTHOR}}\n{{Description}}")

enumerable.Summarize()

Generate text summary for each item using an OpenAI model.

var summaries = items.Summarize(model);

You can control the summarization with a hint

var summaries = items.Summarize(model, "generate a 3 word summary");

enumerable.Answer()

This operator let's you ask a question for each item in a collection.

var answers = items.Answer<float>(model, "What is the cost?");

Defining new operators

All of these operators are built up of 2 core operators

• TransformItemAsync() - which allows you to give a transformation goal and instructions for a single item.
• TransformItems() - Which allows you a transformation goal and instructions for each element in a enumerable collection.

To create a custom operator you create an static class and define static methods for transforming an object or collection of objects.

For example, here is the implementation of Summarize():

• The SummarizeAsync() method defines object operator which calls TransformItemAsync with a default goal of "Create a summarization" with result type of string.
• The Summarize() method defines a collection operator which calls TransformItems with a default goal of "Create a summarization" with result type for each item in the collection of string.

    public static class SummarizeExtension
    {
        // Object operator
        public static Task<string> SummarizeAsync(this object source, ChatClient model, string? goal, string? instructions = null, CancellationToken cancellationToken = default)
            => source.TransformItemAsync<string>(model, goal ?? "create a summarization", instructions, cancellationToken);

        // collection operator
        public static IList<string> Summarize(this IEnumerable<object> source, ChatClient model, string? goal = null, string? instructions = null, int? maxParallel = null, CancellationToken cancellationToken = default)
            => source.TransformItem<string>(model, goal ?? "create a summarization", instructions, maxParallel, cancellationToken);
    }