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Chain of Thought Paradigms in LLMs
Chain of thought (CoT), breaking a problem down into a series of intermediate reasoning steps, has significantly improved the ability of LLMs to perform complex reasoning. But, most importantly, it is the current state-of-the-art in teaching LLMs how to take action (API calls, RPA, or anything else).
An overview of different strategies.
Few-shot CoT. Provide examples of Question-Answer pairs where the answer is explained "step by step."
Q: Roger has 5 tennis balls. He buys 2 more cans of tennis balls. Each can has 3 tennis balls. How many tennis balls does he have now?
A: Roger started with 5 balls. 2 cans of 3 tennis balls each is 6 tennis balls. 5 + 6 = 11. The answer is 11.
Zero-shot CoT. Prefix the Answer block with "Let's think step by step." to prompt the LLM to complete the output in that format.
Self-consistency CoT. First, prompt the model with CoT, generate multiple completions, and choose the most consistent answer. You can think of this as a self-ensemble method.
Least-to-Most. Borrowed from an idea in education psychology, generating a list of questions to answer and then sequentially solving the subquestions. Problem reduction followed by problem-solving.
ReAct. Given a claim or question, generate a completion identifying an action to take, record the action, and make an observation from the result. Repeat until the task is finished, recognized by calling a special FINISH action.
Claim: Princess Mononoke is a film.
Thought 1: I need to search Princess Mononoke and find if it is a film. Action 1: Search[Princess Mononoke] Observation 1: Princess Mononoke ... Thought 2: From the observation, it says that Princess Mononoke is a film. Action 2: Finish[SUPPORTS]
Observation 2: Episode finished
Chain of thought prompting techniques have been shown to increase LLM performance significantly, but they still feel incredibly unoptimized.