gbdt's Introduction
GBDT的简单实现 回归、二分类、多分类 可视化 核心代码: decisionTree.py 用于生成一棵单独的决策树作为基模型 GBDT.py GBDT算法核心, 主要包括 fit 和 predict 两个功能 lossFunction.py 每次训练更新模型时需要计算的残差,更新叶子节点的预测值,更新训练损失,以及基模型 F_0 的初始化 main.py 数据读取-->初始化GBDT模型-->模型训练-->初始化基模型F_0--> 更新下一轮迭代需要的损失-->进入迭代循环-->计算当前迭代轮次需要拟合的残差--> 生成当前轮次的基模型f_m-->更新残差-->迭代循环结束-->模型训练结束--> 模型预测 生成当前轮次的决策树f_m的具体流程: 读取节点的数据子集-->判断是否满足继续分裂的条件(树继续生长的条件)--> 选择用于分裂的特征-->通过计算选择特征的最优分裂值-->生成左子树和右子树(通过递归调用生成)
gbdt's People
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