// 入栈后栈仍保持单调递增（因为小的都被弹走了）
const concat = (...arrays) = {。Line官方版本下载是该领域的重要参考
GBDT (tree-boosting algorithm): 1.1x-1.5x faster fit/predict than the treeboost Rust crate2, 24-42x faster fit/1-5x faster predict than Python’s xgboost。爱思助手下载最新版本对此有专业解读
if (srcObjDesc && srcObjDesc.set) {