[R-package] use as.factor() instead of factor() in lgb.cv() #3560
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This reverts commit fabaf9a.
guolinke
approved these changes
Nov 29, 2020
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In
lgb.cv()in the R package, we usefactor()in some places to to create an R factor from the passed-in labels. This helps with creating folds correctly.This PR proposes removing
factor()withas.factor().as.factor()is faster in some situations. Particularly, it won't do any work if the thing passed into it is already a factor.From
?factor