Two-stage book recommender over 103K titles: multi-source retrieval (ALS, item-kNN, BM25, sentence embeddings) → LightGBM LambdaMART ranking. Temporal split, cold-start routing, FastAPI + Docker, GCP/Vertex scaffolding.
information-retrieval collaborative-filtering ranking lightgbm learning-to-rank recommender-system information-retrieval-engine implicit-feedback lambdamart-model mlops lambdamart implicit-feedbacks fastapi information-retrieval-system vertex-ai two-stage-recommender
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Updated
Aug 23, 2026 - Python