Title: Meta Auxiliary Labels with Constituent-based Transformer for Aspect-based Sentiment Analysis. Abstract: Aspect based sentiment analysis (ABSA) is a challenging natural language processing task that could benefit from syntactic information. Previous work exploit dependency parses to improve performance on the task, but this requires the existence of good dependency parsers.  In this paper, we build a constituent-based transformer for ABSA that can induce constituents without constituent parsers. We also apply meta auxiliary learning to generate labels on edges between tokens, supervised by the objective of the ABSA task.  Without input from dependency parsers, our models outperform previous work on three Twitter data sets and match previous work closely on two review data sets.