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Not sure if anxgboost ordata.table bug. Storing xgboost models in list columns fails with the new xgboost version 3.1.2.1.
library(data.table)library(xgboost)data(mtcars)model_regression= xgboost(mtcars[,-1],mtcars$mpg,nthreads=1,nrounds=3)data.table(model=list(model_regression))# Error in y[] <- lapply(y, reallocate) :# ALTLIST classes must provide a Set_elt method [class: XGBAltrepPointerClass, pkg: xgboost]
See alsodmlc/xgboost#11849
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