我在尝试运行一个SVM模型时，遇到了以下错误：

错误：预处理方法仅限于：BoxCox, YeoJohnson, expoTrans, invHyperbolicSine, center, scale, range, knnImpute, bagImpute, medianImpute, pca, ica, spatialSign, ignore, keep, remove, zv, nzv, conditionalX, corr

我不明白哪里出了问题。

svm.model_unigrams = train(outcome ~.                           , data = training_set_unigrams                           , trControl = training_controls                           , method = "svmRadial"                           , preProcess = (training_set_unigrams, method = c("center", "scale"))                           , na.action = na.pass)

回答：

由于您没有提供任何数据，因此我使用了IRIS数据集。

library(caret)data(iris)svm.model_unigrams = train(Species ~., data = iris,                            trControl = trainControl(method = "cv",                                                      number = 5,                                                      allowParallel = TRUE),                            method = "svmRadial",                            preProc = c("center", "scale"),                            na.action = na.pass)

同样，您可以使用其他方法，例如

train(Species ~., data = iris,                           trControl = trainControl(method = "cv",                                                    number = 5,                                                    allowParallel = TRUE),                           method = "svmRadial",                           preProc = c("BoxCox"),                           na.action = na.pass)