Baobao Algorithm Notes

Mar 18, 2020 · Artificial Intelligence

Optimizing GBDT Splits: The Interview Puzzle Behind LightGBM’s Speed Trick

This article dissects a ByteDance interview algorithm that asks for optimal partitioning of a sequence, derives the underlying GBDT split‑gain formula, and shows how to reduce the naïve O(n²) computation to O(n) using the variance‑gain trick employed by LightGBM.