swift-llm-kit

This library is a Work in Progress

Motivation

LLMKit is a library focussing on providing a highly composable tool to interact with Large Language Models.

a LLMKit value can be seen as a function that takes a CompletionChain and returns a new CompletionChain

a CompletionChain is a list of ChatLog each one being the result of a completion call to the LLM

Usage

// Create a openAI llmkit
let llm: LLMKit = .openAI(apiKey:"<your api token>")

// Initialize a completion chain
let initialChain: CompletionChain = .init(systemPrompt: "")
// Get a new completion by calling openAI api
let chain: CompletionChain = try await llm(chain: initialChain, message"Hello!")

// Get the last state of the chat
let chatLog: ChatLog = chain.output
// get the last message
let lastMessage: Model.MessageContent? = chatLog.messages.last

Constructing a llmKit elements

The library is heavily composability oriented. It provides a lot of ways to construct and compose llmKit elements but you can easily implement your own.

Creation

let llm: LLMKit = .openAI()
let llm: LLMKit = .openAI(url: "...")

// misc examples
let llm: LLMKit = .echoing // just repeats the last user's message
let llm: LLMKit = .jsEvaluating // returns the result of the last user's message evaluated as a js expression

// you can even implement your own computation by using the poor man's plugin
let llm: LLMKit = .computing { chatLog in 
    let computedString = ...
    return computedString
}

Modify and Compose

let filtering = llm.filter { message in 
    message.user == .agent
} 
let debugged = llm.debug
let pipe = llm.pipe(llm2) (or llm | llm2)
let fallingback = llm.fallback(llm2)

implementing your own LLMKit

Extensing the library is straightforward.

extension LLMKit { 
    static var myLLMKit: Self { 
        .init { chatLog in
            let computedChatLog = ...
            return computedChatLog
        }
    }
}
...
// getting an instance
let myLLM: LLMKit = .myLLMKit // you can also use all modification / composition tools like .debug, .pipe, etc..

// using it...
let completion = try await myLLM.complete(chatLog, message: "Hello!")

You can take a look at how LLMKit.openAI or LLMKit.echo are implemented. Those are good sources of information.

Streaming

WIP...

// get a stream of chatlog deltas
let chatLogDeltas: AsyncThrowingStream<ChatLog.Delta> = try await llm.stream(chatLog, message: "hello!")

Window management