Exchange Internship, West Japan Railway Company (Mar 2025 – Jun 2025)
Researched and implemented hybrid retrieval pipelines for GraphRAG by combining BM25 keyword search with semantic retrieval. Built retrieval-centric components that support downstream model training and evaluation using mixed lexical and embedding-based signals. Although no explicit labeling is stated, the work supports preparing and curating training/evaluation data through retrieval. • Implemented hybrid retrieval using BM25 + semantic search. • Developed GraphRAG-style pipeline logic for knowledge retrieval. • Enabled selection of relevant text/graph context for model use. • Supported training or evaluation workflows via retrieval outputs.