llmflows 0.0.10

LLMFlows - Simple, Explicit and Transparent LLM Apps

Documentation: https://llmflows.readthedocs.io
PyPI: https://pypi.org/project/llmflows
Twitter: https://twitter.com/LLMFlows
Substack: https://llmflows.substack.com

About

LLMFlows is a framework for building simple, explicit, and transparent LLM(Large Language Model) applications.

Installation

pip install llmflows

Philosophy

Simple

Our goal is to build a simple, well-documented framework with minimal abstractions that allow users to build flexible LLM-powered apps without compromising on capabilities.

Explicit

We want to create an explicit API enabling users to write clean and readable code while easily creating complex flows of LLMs interacting with each other. LLMFlows' classes give users full control and do not have any hidden prompts or LLM calls.

Transparent

We aim to help users have full transparency on their LLM-powered apps by providing traceable flows and complete information for each app component, making it easy to monitor, maintain, and debug.

Getting Started

LLMs

LLMs are one of the main abstractions in LLMFlows. LLM classes are wrappers around LLM APIs such as OpenAI's APIs. They provide methods for configuring and calling these APIs, retrying failed calls, and formatting the responses.

from llmflows.llms import OpenAI

llm = OpenAI(api_key="<your-openai-api-key>")

result, call_data, model_config = llm.generate(
   prompt="Generate a cool title for an 80s rock song"
)

PromptTemplates

The PromptTemplate class allows us to create strings with variables that we can fill in dynamically later on. Once a prompt template object is created an actual prompt can be generated by providing the required variables.

from llmflows.llms import OpenAI
from llmflows.prompts import PromptTemplate


prompt_template = PromptTemplate(
    prompt="Generate a title for a 90s hip-hop song about {topic}."
)
llm_prompt = prompt_template.get_prompt(topic="friendship")

print(llm_prompt)

llm = OpenAI(api_key="<your-openai-api-key>")
song_title = llm.generate(llm_prompt)

print(song_title)

Chat LLMs

Unlike regular LLMs that only require a prompt to generate text, chat LLMs require a conversation history. The conversation history is represented as a list of messages between a user and an assistant. This conversation history is sent to the model, and a new message is generated based on it.

LLMFlows provides a MessageHistory class to manage the required conversation history for chat LLMs.

You can build a simple chatbot by using the OpenAIChat and MessageHistory classes:

from llmflows.llms import OpenAIChat, MessageHistory

llm = OpenAIChat(api_key="<your-openai-api-key>")
message_history = MessageHistory()

while True:
    user_message = input("You:")
    message_history.add_user_message(user_message)

    llm_response, call_data, model_config = llm.generate(message_history)
    message_history.add_ai_message(llm_response)

    print(f"LLM: {llm_response}")

LLM Flows

Often times, real-world applications can be more complex and can have dependencies between prompts and LLM calls. For example:

When you want to build apps with complex dependencies you can use the Flow and Flowstep classes. LLMFlows will figure out the dependencies and make sure each flowstep runs only when all its dependencies are met:

from llmflows.flows import Flow, FlowStep
from llmflows.llms import OpenAI
from llmflows.prompts import PromptTemplate

openai_llm = OpenAI(api_key="<your-openai-api-key>")

# Create prompt templates
title_template = PromptTemplate("What is a good title of a movie about {topic}?")
song_template = PromptTemplate(
    "What is a good song title of a soundtrack for a movie called {movie_title}?"
)
characters_template = PromptTemplate(
    "What are two main characters for a movie called {movie_title}?"
)
lyrics_template = PromptTemplate(
    "Write lyrics of a movie song called {song_title}. The main characters are "
    "{main_characters}"
)

# Create flowsteps
movie_title_flowstep = FlowStep(
    name="Movie Title Flowstep",
    llm=openai_llm,
    prompt_template=title_template,
    output_key="movie_title",
)

song_title_flowstep = FlowStep(
    name="Song Title Flowstep",
    llm=openai_llm,
    prompt_template=song_template,
    output_key="song_title",
)

characters_flowstep = FlowStep(
    name="Characters Flowstep",
    llm=openai_llm,
    prompt_template=characters_template,
    output_key="main_characters",
)

song_lyrics_flowstep = FlowStep(
    name="Song Lyrics Flowstep",
    llm=openai_llm,
    prompt_template=lyrics_template,
    output_key="song_lyrics",
)

# Connect flowsteps
movie_title_flowstep.connect(song_title_flowstep, characters_flowstep, song_lyrics_flowstep)
song_title_flowstep.connect(song_lyrics_flowstep)
characters_flowstep.connect(song_lyrics_flowstep)

# Create and run Flow
soundtrack_flow = Flow(movie_title_flowstep)
results = soundtrack_flow.start(topic="friendship", verbose=True)

Async Flows

Sometimes multiple flow steps can run in parallel if all their dependencies are met. For cases like this, LLMFlows provides async classes to improve the runtime of any complex flow by running flow steps that already have all their required inputs in parallel.

...

movie_title_flowstep = AsyncFlowStep(
    name="Movie Title Flowstep",
    llm=openai_llm,
    prompt_template=title_template,
    output_key="movie_title",
)

song_title_flowstep = FlowStep(
    name="Song Title Flowstep",
    llm=openai_llm,
    prompt_template=song_template,
    output_key="song_title",
)

characters_flowstep = AsyncFlowStep(
    name="Characters Flowstep",
    llm=openai_llm,
    prompt_template=characters_template,
    output_key="main_characters",
)

song_lyrics_flowstep = AsyncFlowStep(
    name="Song Lyrics Flowstep",
    llm=openai_llm,
    prompt_template=lyrics_template,
    output_key="song_lyrics",
)

...

For more examples, such as integrating vector databases, creating question-answering apps, agents, and web applications visit our documentation or check out the examples folder of the repository.

Features

LLMs

• Utilize LLMs such as OpenAI's ChatGPT to generate natural language text.
• Configure LLM classes easily, choosing specific models, parameters, and settings.
• Benefit from automatic retries when model calls fail, ensuring reliable LLM interactions.

Prompt Templates

• Create dynamic prompts using Prompt Templates, providing flexible and customizable text generation.
• Define variables within prompts to generate prompt strings tailored to specific inputs.

Flows and FlowSteps

• Structure LLM applications using Flows and FlowSteps, providing a clear and organized framework for executing LLM interactions.
• Connect flow steps to pass outputs as inputs, facilitating seamless data flow and maintaining a transparent LLM pipeline.
• Leverage Async Flows to run LLMs in parallel when all their inputs are available, optimizing performance and efficiency.
• Incorporate custom string manipulation functions directly into flows, allowing specialized text transformations without relying solely on LLM calls.

VectorStore Integrations

• Integrate with vector databases like Pinecone using the VectorStoreFlowStep, empowering efficient and scalable storage and retrieval of vector embeddings.
• Leverage vector databases for seamless storage and querying of vectors, enabling straightforward integration with LLM-powered applications.

Callbacks

• Execute callback functions at different stages within flow steps, enabling enhanced customization, logging, tracing, or other specific integrations.
• Utilize callbacks to comprehensively control and monitor LLM-powered apps, ensuring clear visibility into the execution process.

Explicit API and Full Transparency

With LLMFlows you have the full control to create explicit applications without any hidden prompts or predefined behaviors.

In addition LLMFlows allows you to answer questions such as:

• When was a particular flowstep run?
• How much time did it take?
• What were the input variables?
• What was the prompt template?
• What did the prompt look like?
• What was the exact configuration of the model?
• How many times did we retry the request?
• What was the raw data the API returned?
• How many tokens were used?
• What was the final result?

User Guide

Introduction
LLM Flows
Async Flows
Vector Stores
Question Answering
Vector Stores in Flows
Functional FlowSteps
Callbacks
LLM Flows with FastAPI
Agents

Examples

You can find all examples used in the User Guide in the examples folder of the repository.

License

LLMFlows is covered by the MIT license. For more information, check LICENCE.

Contributing

Thank you for spending time going over our README! If you find LLMFlows exciting and you are considering contributing, please check CONTRIBUTING.md.