Benchmarking Causal Study to Interpret Large Language Models for Source
Code
- URL: http://arxiv.org/abs/2308.12415v1
- Date: Wed, 23 Aug 2023 20:32:12 GMT
- Title: Benchmarking Causal Study to Interpret Large Language Models for Source
Code
- Authors: Daniel Rodriguez-Cardenas, David N. Palacio, Dipin Khati, Henry Burke,
Denys Poshyvanyk
- Abstract summary: This paper introduces a benchmarking strategy named Galeras comprised of curated testbeds for three SE tasks.
We illustrate the insights of our benchmarking strategy by conducting a case study on the performance of ChatGPT under distinct prompt engineering methods.
- Score: 6.301373791541809
- License: http://creativecommons.org/licenses/by-sa/4.0/
- Abstract: One of the most common solutions adopted by software researchers to address
code generation is by training Large Language Models (LLMs) on massive amounts
of source code. Although a number of studies have shown that LLMs have been
effectively evaluated on popular accuracy metrics (e.g., BLEU, CodeBleu),
previous research has largely overlooked the role of Causal Inference as a
fundamental component of the interpretability of LLMs' performance. Existing
benchmarks and datasets are meant to highlight the difference between the
expected and the generated outcome, but do not take into account confounding
variables (e.g., lines of code, prompt size) that equally influence the
accuracy metrics. The fact remains that, when dealing with generative software
tasks by LLMs, no benchmark is available to tell researchers how to quantify
neither the causal effect of SE-based treatments nor the correlation of
confounders to the model's performance. In an effort to bring statistical rigor
to the evaluation of LLMs, this paper introduces a benchmarking strategy named
Galeras comprised of curated testbeds for three SE tasks (i.e., code
completion, code summarization, and commit generation) to help aid the
interpretation of LLMs' performance. We illustrate the insights of our
benchmarking strategy by conducting a case study on the performance of ChatGPT
under distinct prompt engineering methods. The results of the case study
demonstrate the positive causal influence of prompt semantics on ChatGPT's
generative performance by an average treatment effect of $\approx 3\%$.
Moreover, it was found that confounders such as prompt size are highly
correlated with accuracy metrics ($\approx 0.412\%$). The end result of our
case study is to showcase causal inference evaluations, in practice, to reduce
confounding bias. By reducing the bias, we offer an interpretable solution for
the accuracy metric under analysis.
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