Ensemble Learning Methods for Legal Processing Tasks in ALQAC 2022

Automated Legal Question Answering Competition is an annual competition to find the best solution to automatically answer legal questions based on well-known statute laws in the Vietnamese Language. In this paper, we will demonstrate how to solve the problems posed by ALQAC 2022, using BERT and its variants as a backbone network. In addition, we also study using tf-idf and BM-25 to rank the relevance of legal documents. At the same time, this publication also show how to enhance training data to solve the problem of limited training data.