CodeChain: Towards Modular Code Generation Through Chain of Self-revisions with Representative Sub-modules
(2310.08992)Abstract
LLMs have already become quite proficient at solving simpler programming tasks like those in HumanEval or MBPP benchmarks. However, solving more complex and competitive programming tasks is still quite challenging for these models - possibly due to their tendency to generate solutions as monolithic code blocks instead of decomposing them into logical sub-tasks and sub-modules. On the other hand, experienced programmers instinctively write modularized code with abstraction for solving complex tasks, often reusing previously developed modules. To address this gap, we propose CodeChain, a novel framework for inference that elicits modularized code generation through a chain of self-revisions, each being guided by some representative sub-modules generated in previous iterations. Concretely, CodeChain first instructs the LLM to generate modularized codes through chain-of-thought prompting. Then it applies a chain of self-revisions by iterating the two steps: 1) extracting and clustering the generated sub-modules and selecting the cluster representatives as the more generic and re-usable implementations, and 2) augmenting the original chain-of-thought prompt with these selected module-implementations and instructing the LLM to re-generate new modularized solutions. We find that by naturally encouraging the LLM to reuse the previously developed and verified sub-modules, CodeChain can significantly boost both modularity as well as correctness of the generated solutions, achieving relative pass@1 improvements of 35% on APPS and 76% on CodeContests. It is shown to be effective on both OpenAI LLMs as well as open-sourced LLMs like WizardCoder. We also conduct comprehensive ablation studies with different methods of prompting, number of clusters, model sizes, program qualities, etc., to provide useful insights that underpin CodeChain's success.
Overview
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CodeChain is a novel framework that enhances code generation by LLMs through modularization.
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It uses chain-of-thought (CoT) prompting to start building sub-modules of code solutions.
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An iterative self-revision process selects and refines the best sub-modules for further improvement.
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Experiments show that CodeChain increases both modularity and correctness in code produced by LLMs.
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The framework mimics human-like problem-solving and represents an advancement in AI code generation.
Introduction to CodeChain
The process of writing high-quality computer programs often involves breaking down complex tasks into smaller, more manageable components called sub-modules, essentially crafting a solution piece by piece. This is a programming paradigm that human developers commonly use but has been notably challenging for LLMs. The paper introduces CodeChain, a novel framework designed to elicit a similar modular approach in code generation from LLMs. It strategically prompts these models to decompose tasks into sub-modules, revising and improving them iteratively to construct a comprehensive solution.
Modularity in AI-Generated Code
The framework starts by encouraging an LLM to outline a problem solution in sub-modules using chain-of-thought (CoT) prompting. Although prompting alone sometimes decreases the correctness of generated solutions, because models are not innately trained to create perfectly modular structures, CodeChain introduces an iterative process of self-revisions. In this process, a selection of sub-modules from these initial outputs is chosen based on their potential for reuse and generic applicability. These sub-modules then form the basis for a new generation round, prompting the LLM to generate improved, modularized solutions.
The Chain of Self-Revisions
A key element of CodeChain is the method of extracting and clustering sub-modules from generated code, then using the most exemplary elements of these clusters in subsequent revisions. This iterative clustering and self-refinement encourages models to internalize and iterate upon the most reusable code components. The framework provides a means of iterative learning that mirrors the process experienced developers may undertake—refining, debugging, and reusing portions of code as needed until a satisfactory solution is achieved.
Results and Insights
Extensive experiments utilizing CodeChain with various LLMs, including OpenAI's models and the open-sourced WizardCoder, demonstrated a significant increase in both the modularity and correctness of the generated code. CodeChain marked improvements over traditional methods, particularly in challenging coding tasks. The insights from ablation studies further emphasized the importance of the clustering selection process and revising in improving the generated code.
In conclusion, CodeChain opens up new possibilities for advanced, modular code generation by LLMs, reflecting a more human-like approach to problem-solving in programming. The framework's ability to guide LLMs in the direction of generating increasingly modularized, correct, and sophisticated code solutions represents a significant stride in the field of AI-driven code generation.
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