小编Ant*_*nCH的帖子

我是windows用户.几个星期前,我安装了R和Rstudio并安装了许多软件包.今天有一个拼写没有安装新包.

警告:无法访问存储库的索引http://www.stats.ox.ac.uk/pub/RWin/src/contrib:无法打开URL'http://www.stats.ox.ac.uk/pub/ RWin/src/contrib/PACKAGES '

我重新安装了R,但这并没有解决问题.

install.packages中的警告:InternetOpenUrl失败:'无法连接到服务器'

我使用 XGBoost 构建预测模型：

setDT(train)
setDT(test)

labels <- train$Goal
ts_label <- test$Goal
new_tr <- model.matrix(~.+0,data = train[,-c("Goal"),with=F]) 
new_ts <- model.matrix(~.+0,data = test[,-c("Goal"),with=F])

labels <- as.numeric(labels)-1
ts_label <- as.numeric(ts_label)-1

dtrain <- xgb.DMatrix(data = new_tr,label = labels) 
dtest <- xgb.DMatrix(data = new_ts,label=ts_label)

params <- list(booster = "gbtree", objective = "binary:logistic", eta=0.3, gamma=0, max_depth=6, min_child_weight=1, subsample=1, colsample_bytree=1)

xgb1 <- xgb.train(params = params, data = dtrain, nrounds = 291, watchlist = list(val=dtest,train=dtrain), print_every_n = 10, 
                   early_stop_round = 10, maximize = F , eval_metric = "error") …