Features

• Support user import and export.
• Save statistics to data store instead of cache store.
• Use IDF-based similarity for users and items.
• Remove confusing click feedback type (#191).
• Support user-based recommendation (#242).
• Support accuracy/precision/recall/AUC metrics for CTR prediction (#204).
• Support multi-source recommendation.

Fix

• Handle multiple occurrence users/items when loading datasets from ClickHouse (5bf340a1d5d0022cba0ec1b653a939ddd486d82b).

Upgrade Guide

In configuration file:

• click_feedback_types has been removed.
• neighbor_type has been replaced by item_neighbor_type and user_neighbor_type.
• enable_latest_recommend, enable_popular_recommend, enable_user_based_recommend, enable_item_based_recommend and enable_collaborative_recommend are added.
• fallback_recommend becomes a slice of strings.