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Showing posts with the label OpenAI

Reinforcement Learning with Human Feedback: A Powerful Approach to AI Training

The unprecedented capabilities exhibited by the large language models (LLMs) such as ChatGPT and GPT-4 have created enormous excitement as well as concerns about the impact of AI on the society in near and far future. Behind the success of LLMs and AI in general lies among other techniques a learning approach called Reinforcement Learning with Human Feedback (RLHF). In this blog post, we will try to understand what RLHF is and why it offers a powerful approach to training AI models. However, before we do that, let's try to understand the concept of reinforcement learning (RL). What is Reinforcement Learning (RL)? RL, inspired by the principles of behavioral psychology, is a machine learning technique wherein the learner, called an agent , learns decision making by exploring an environment through a trial-and-error process to achieve its goal. Each action by the agent results in feedback in the form of a reward or punishment . While performing actions and receiving feedback, the a

Exploring Large Language Models: Types and Applications

Large language models (LLMs) are currently the craze. Who hasn't heard of ChatGPT that can deliver all kinds of responses to user prompts, be a recipe or suggestions for vacation or an essay on a topic for a term paper. It is all possible because of the underlying large language models. So what are large language models? How do these models work? What can we do with these models? Let's try to answer these questions without going into much technical details. What are Large Language Models? We will begin by first trying to understand what is a language model. Think about using your cell phone for messaging. As you enter text, your cell phone tries to guess the word you are typing, see the figure below. Under the hood, a language model is computing probabilities for the next character/word and is displaying the top three or five most probable characters/words.  There are a few types of language models such as rule-based models, statistical language models, and the recurrent neura