[R] Fix CRAN test notes. (#8428)
- Limit the number of used CPU cores in examples. - Add a note for the constraint. - Bring back the cleanup script.
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@@ -192,8 +192,8 @@
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#' data(agaricus.train, package='xgboost')
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#' data(agaricus.test, package='xgboost')
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#'
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#' dtrain <- with(agaricus.train, xgb.DMatrix(data, label = label))
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#' dtest <- with(agaricus.test, xgb.DMatrix(data, label = label))
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#' dtrain <- with(agaricus.train, xgb.DMatrix(data, label = label, nthread = 2))
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#' dtest <- with(agaricus.test, xgb.DMatrix(data, label = label, nthread = 2))
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#' watchlist <- list(train = dtrain, eval = dtest)
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#'
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#' ## A simple xgb.train example:
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