  The quality of the dataset is crucial for ensuring optimal performance and
reliability of downstream task models. However, datasets often contain noisy
data inadvertently included during the construction process. Numerous attempts
have been made to correct this issue through human annotators. However, hiring
and managing human annotators is expensive and time-consuming. As an
alternative, recent studies are exploring the use of large language models
(LLMs) for data annotation.
  In this study, we present a case study that extends the application of
LLM-based data annotation to enhance the quality of existing datasets through a
cleansing strategy. Specifically, we leverage approaches such as
chain-of-thought (CoT) and majority voting to imitate human annotation and
classify unrelated documents from the Multi-News dataset, which is widely used
for the multi-document summarization task. Through our proposed cleansing
method, we introduce an enhanced Multi-News+. By employing LLMs for data
cleansing, we demonstrate an efficient and effective approach to improving
dataset quality without relying on expensive human annotation efforts.
