LlamaIndex Llms Integration: Litellm

Installation

Install the required Python packages:

bash

%pip install llama-index-llms-litellm
!pip install llama-index

Usage

Import Required Libraries

python

import os
from llama_index.llms.litellm import LiteLLM
from llama_index.core.llms import ChatMessage

Set Up Environment Variables

Set your API keys as environment variables:

python

os.environ["OPENAI_API_KEY"] = "your-api-key"
os.environ["COHERE_API_KEY"] = "your-api-key"

Example: OpenAI Call

To interact with the OpenAI model:

python

message = ChatMessage(role="user", content="Hey! how's it going?")
llm = LiteLLM("gpt-3.5-turbo")
chat_response = llm.chat([message])
print(chat_response)

Example: Cohere Call

To interact with the Cohere model:

python

llm = LiteLLM("command-nightly")
chat_response = llm.chat([message])
print(chat_response)

Example: Chat with System Message

To have a chat with a system role:

python

messages = [
    ChatMessage(
        role="system", content="You are a pirate with a colorful personality"
    ),
    ChatMessage(role="user", content="Tell me a story"),
]
resp = LiteLLM("gpt-3.5-turbo").chat(messages)
print(resp)

Streaming Responses

To use the streaming feature with stream_complete:

python

llm = LiteLLM("gpt-3.5-turbo")
resp = llm.stream_complete("Paul Graham is ")
for r in resp:
    print(r.delta, end="")

Streaming Chat Example

To stream chat messages:

python

llm = LiteLLM("gpt-3.5-turbo")
resp = llm.stream_chat(messages)
for r in resp:
    print(r.delta, end="")

Asynchronous Example

For asynchronous calls, use:

python

llm = LiteLLM("gpt-3.5-turbo")
resp = await llm.acomplete("Paul Graham is ")
print(resp)

LLM Implementation example

https://docs.llamaindex.ai/en/stable/examples/llm/litellm/