应该是用kknn包kknn(formula = formula(train), train, test, na.action = na.omit(),
k = 7, distance = 2, kernel = "optimal", ykernel = NULL, scale=TRUE,
contrasts = c('unordered' = "contr.dummy", ordered = "contr.ordinal"))
kknn.dist(learn, valid, k = 10, distance = 2)
Nadaraya-Watson的话，ksmooth(x, y, kernel="normal", bandwidth ,....)
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