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有人可以帮我解决以下问题:我需要将我的xgboost训练模型与插入符号包一起更改为未知错误度量RMSLE。默认情况下,caret和xgboost训练和测量RMSE。在插入符号中创建RMSLE度量标准
这里是行代码:
在插入符格式
custom_summary = function(data, lev = NULL, model = NULL){
out = rmsle(data[, "obs"], data[, "pred"])
names(out) = c("rmsle")
out
}
创建控制对象
control = trainControl(method = "cv",
number = 2,
summaryFunction = custom_summary)
创建的调谐参数网格中创建自定义摘要函数
grid = expand.grid(nrounds = 100,
max_depth = 6,
eta = 0.075,
gamma = 0,
colsample_bytree = 0.4,
min_child_weight = 2.25,
subsample = 1)
cl = makeCluster(3, type="SOCK") #make clusters
registerDoSNOW(cl) #register clusters
set.seed(1)
训练我的模型
caret4 = train(price_doc~. - sub_area - id,
data=train.train,
method="xgbTree",
trControl=control,
tuneGrid=grid,
metric="rmsle",
maximize = FALSE)