Performance

• Cache items in workers during offline recommendation (8bbe7a65089e2bf18efcb2163925fc1a27a53b00).
• Skip cold items and users during fitting CCD recommender (dc3c66f18f3e47a1c735c75c5b574b06be45dabd).
• Speed up neighbor searching by bitset and timestamps (7698ce7fe4aaa574a05af5d7570cf1ad24e3b2f0, f6d78bc17bcd8344e841a60de1dc5ff9d19df2e8, 06f604d426955380b94f57a79d303dac3314b21d).
• Optimize data loading by channel (5236e8ce70ceb0b28fcbfe8d58ff0e5e208fdd12).
• Optimize memory usage (2f34bcd3b11c28be1e3852b17997f809616a1b3c, eaecd64084b5d8b4b6025e25bec323e582e11815).

Fix

• Start HTTP server before loading datasets (#256).
• Send large model over gRPC (#246).
• Handle UTF-8 characters when reading lines from a csv file (#251, authorized by @amaaazing).
• Replace unsupported new SQL syntax with compatible SQL syntax (#249 authorized by @hetao29).
• Disable authorization for dashboard (a863e903b0a24f513589ac75b704b96644cc580c).
• Fix responses in swagger apidocs (#262, authorized by @ccfish86).