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data_mining:xgboost [2019/05/03 01:13] – [Taylor expansion] phreazer | data_mining:xgboost [2020/08/02 16:11] – phreazer | ||
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===== Gradient boosting ===== | ===== Gradient boosting ===== | ||
- | $F$ is space of functions containing all regression trees | + | * $F$ is space of functions containing all regression trees |
- | $K$ is number of trees | + | |
- | $f_k(x_i)$ is regression tree that maps a attribute to a score | + | |
Learn functions (trees) instead of weights in $R^d$. | Learn functions (trees) instead of weights in $R^d$. |