Seems getting info of 'group' slot doesn't works (in R) about xgboost HOT 4 CLOSED

Yes, the group information was not accessible in current version. The
reason is internal data structure of group is not exactly what you set. It
is the only information you can not access but can set

On Wed, Sep 24, 2014 at 11:29 AM, Blind Ape [email protected]
wrote:

require(xgboost)
data(agaricus.train, package='xgboost')
train <- agaricus.train
group = rep(seq(1:3), length.out = length(train[[1]]))
dtrain <- xgb.DMatrix(data = train$data, label = train$label, group =
group)
works

labels <- getinfo(dtrain, 'label')
head(labels)
[1] 1 0 0 1 0 0
doesn't works

groups <- getinfo(dtrain, 'group')
Error en .local(object, ...) : xgb.getinfo: unknown info name group
low level works

labels <- .Call("XGDMatrixGetInfo_R", dtrain, 'label', PACKAGE = "xgboost")
head(labels)
[1] 1 0 0 1 0 0
low level doesn't works

groups <- .Call("XGDMatrixGetInfo_R", dtrain, 'group', PACKAGE = "xgboost")
Error: unknown field group
explicit setinfo

setinfo(dtrain, 'group', group)
[1] TRUE
groups <- .Call("XGDMatrixGetInfo_R", dtrain, 'group', PACKAGE = "xgboost")
Error: unknown field group

—
Reply to this email directly or view it on GitHub
https://github.com/tqchen/xgboost/issues/83.

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See updated customized obj script, where you will be able to set anything to DMatrix for customized function to use

https://github.com/tqchen/xgboost/blob/master/R-package/demo/custom_objective.R

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@tqchen any change for getinfo "group" ?
I just tried with no success (by modifying the R source code) :-(

> getinfo(dtrain, 'group')
Error in getinfo.xgb.DMatrix(dtrain, "group") : 
  [16:58:17] ../..//amalgamation/../src/c_api/c_api.cc:488: Unknown float field name group

Stack trace returned 10 entries:
[bt] (0) /home/benesty_local/R/x86_64-pc-linux-gnu-library/3.4/xgboost/libs/xgboost.so(_ZN4dmlc15LogMessageFatalD1Ev+0x36) [0x7fc23a9d9996]
[bt] (1) /home/benesty_local/R/x86_64-pc-linux-gnu-library/3.4/xgboost/libs/xgboost.so(XGDMatrixGetFloatInfo+0x10e) [0x7fc23a9e04fe]
[bt] (2) /home/benesty_local/R/x86_64-pc-linux-gnu-library/3.4/xgboost/libs/xgboost.so(XGDMatrixGetInfo_R+0x51) [0x7fc23a9d6671]
[bt] (3) /usr/lib/R/lib/libR.so(+0xd2d3c) [0x7fc263f52d3c]
[bt] (4) /usr/lib/R/lib/libR.so(Rf_eval+0x7c5) [0x7fc263f8fab5]
[bt] (5) /usr/lib/R/lib/libR.so(+0x1136a6) [0x7fc263f936a6]
[bt] (6) /usr/lib/R/lib/libR.so(Rf_eval+0x5a0) [0x7fc263f8f890]
[bt] (7) /usr/lib/R/lib/libR.so(+0x112538) [0x7fc263f92538]
[bt] (8) /usr/lib/R/lib/libR.so(Rf_eval+0x5a0) [0x7fc263f8f890]
[bt] (9) /usr/lib/R/lib/libR.so(Rf_eval+0x5a0) [0x7fc263f8f890]

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linked to
#1431
#574 (comment) (closure solution)

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