ChatPremAI

PremAI is an all-in-one platform that simplifies the creation of robust, production-ready applications powered by Generative AI. By streamlining the development process, PremAI allows you to concentrate on enhancing user experience and driving overall growth for your application. You can quickly start using our platform here.

This example goes over how to use LangChain to interact with different chat models with ChatPremAI

Installation and setup

We start by installing langchain and premai-sdk. You can type the following command to install:

pip install premai langchain

Before proceeding further, please make sure that you have made an account on PremAI and already created a project. If not, please refer to the quick start guide to get started with the PremAI platform. Create your first project and grab your API key.

from langchain_community.chat_models import ChatPremAI
from langchain_core.messages import HumanMessage, SystemMessage

API Reference:ChatPremAI | HumanMessage | SystemMessage

Setup PremAI client in LangChain

Once we imported our required modules, let's setup our client. For now let's assume that our project_id is 8. But make sure you use your project-id, otherwise it will throw error.

To use langchain with prem, you do not need to pass any model name or set any parameters with our chat-client. By default it will use the model name and parameters used in the LaunchPad.

Note: If you change the model or any other parameters like temperature or max_tokens while setting the client, it will override existing default configurations, that was used in LaunchPad.

import getpass
import os

# First step is to set up the env variable.
# you can also pass the API key while instantiating the model but this
# comes under a best practices to set it as env variable.

if os.environ.get("PREMAI_API_KEY") is None:
    os.environ["PREMAI_API_KEY"] = getpass.getpass("PremAI API Key:")

# By default it will use the model which was deployed through the platform
# in my case it will is "claude-3-haiku"

chat = ChatPremAI(project_id=8)

Chat Completions

ChatPremAI supports two methods: invoke (which is the same as generate) and stream.

The first one will give us a static result. Whereas the second one will stream tokens one by one. Here's how you can generate chat-like completions.

human_message = HumanMessage(content="Who are you?")

response = chat.invoke([human_message])
print(response.content)

I am an artificial intelligence created by Anthropic. I'm here to help with a wide variety of tasks, from research and analysis to creative projects and open-ended conversation. I have general knowledge and capabilities, but I'm not a real person - I'm an AI assistant. Please let me know if you have any other questions!

Above looks interesting right? I set my default lanchpad system-prompt as: Always sound like a pirate You can also, override the default system prompt if you need to. Here's how you can do it.

system_message = SystemMessage(content="You are a friendly assistant.")
human_message = HumanMessage(content="Who are you?")

chat.invoke([system_message, human_message])

AIMessage(content="I am an artificial intelligence created by Anthropic. My purpose is to assist and converse with humans in a friendly and helpful way. I have a broad knowledge base that I can use to provide information, answer questions, and engage in discussions on a wide range of topics. Please let me know if you have any other questions - I'm here to help!")

You can provide system prompt here like this:

chat.invoke([system_message, human_message], temperature=0.7, max_tokens=10, top_p=0.95)

AIMessage(content='I am an artificial intelligence created by Anthropic')

If you are going to place system prompt here, then it will override your system prompt that was fixed while deploying the application from the platform.

Please note that the current version of ChatPremAI does not support parameters: n and stop.

Streaming

In this section, let's see how we can stream tokens using langchain and PremAI. Here's how you do it.

import sys

for chunk in chat.stream("hello how are you"):
    sys.stdout.write(chunk.content)
    sys.stdout.flush()

Hello! As an AI language model, I don't have feelings or a physical state, but I'm functioning properly and ready to assist you with any questions or tasks you might have. How can I help you today?

Similar to above, if you want to override the system-prompt and the generation parameters, you need to add the following:

import sys

# For some experimental reasons if you want to override the system prompt then you
# can pass that here too. However it is not recommended to override system prompt
# of an already deployed model.

for chunk in chat.stream(
    "hello how are you",
    system_prompt="act like a dog",
    temperature=0.7,
    max_tokens=200,
):
    sys.stdout.write(chunk.content)
    sys.stdout.flush()

Hello! As an AI language model, I don't have feelings or a physical form, but I'm functioning properly and ready to assist you. How can I help you today?