Nagisa: Japanese Tokenizer and POS Tagger

Nagisa is a Python module for Japanese word segmentation and Part-of-Speech (POS) tagging. It is built upon recurrent neural networks, leveraging both character- and word-level features for segmentation and tag dictionary information for POS tagging. Designed to be simple and easy to use, the library is actively maintained with version 0.2.12 as of February 2026, receiving periodic updates to address bugs and improve performance.