Preston Fu proposes Progressive Point Matching (PPM), a framework for assigning partial credit in reinforcement learning tasks by treating reasoning as paths through a state space of intermediate results called reasoning points. PPM addresses the inefficiency of sparse outcome rewards for long-horizon tasks by enabling unbiased credit assignment through a shortcutting mechanism that rewards progress toward task success.
DNSCrypt is a network protocol that authenticates and encrypts DNS traffic between users and recursive name servers, preventing eavesdropping and man-in-the-middle attacks while mitigating UDP-based amplification attacks. Originally designed by Frank Denis and Yecheng Fu, it has been adopted by major public DNS resolvers including OpenDNS, Yandex, CloudNS, AdGuard, and Quad9, with implementations available across multiple operating systems.