A Silver-tongued Writer: A Deep Learning and NLP based Bengali Sentence Composer for Politeness Transfer

The key contributions of this research are as follows:
• We construct a labeled Bengali politeness classification dataset of 12,300 comments (three-annotator majority voting), derived from a larger public Bengali comment corpus.

• We conduct a systematic comparison of three deep learning architectures and six transformer variants for Bengali politeness classification, showing that BanglaBERT achieves the best accuracy, precision, recall, and F1-score (all 84%) among all models tested.

• We construct one of the first manually curated Bengali impolite lexicons (410 entries) and integrate it into a complete classify–substitute–paraphrase pipeline that converts impolite Bengali sentences into polite, meaning-preserving equivalents.