Only column names are supported for lgb.Dataset, thus setting of
row names would have no effect and returned row names would be NULL.
object of class lgb.Dataset
a list of two elements: the first one is ignored and the second one is column names
A list with the dimension names of the dataset
Generic dimnames methods are used by colnames.
Since row names are irrelevant, it is recommended to use colnames directly.
# \donttest{
setLGBMthreads(2L)
data.table::setDTthreads(1L)
data(agaricus.train, package = "lightgbm")
train <- agaricus.train
dtrain <- lgb.Dataset(train$data, label = train$label)
lgb.Dataset.construct(dtrain)
dimnames(dtrain)
#> [[1]]
#> NULL
#>
#> [[2]]
#> [1] "cap-shape=bell" "cap-shape=conical"
#> [3] "cap-shape=convex" "cap-shape=flat"
#> [5] "cap-shape=knobbed" "cap-shape=sunken"
#> [7] "cap-surface=fibrous" "cap-surface=grooves"
#> [9] "cap-surface=scaly" "cap-surface=smooth"
#> [11] "cap-color=brown" "cap-color=buff"
#> [13] "cap-color=cinnamon" "cap-color=gray"
#> [15] "cap-color=green" "cap-color=pink"
#> [17] "cap-color=purple" "cap-color=red"
#> [19] "cap-color=white" "cap-color=yellow"
#> [21] "bruises?=bruises" "bruises?=no"
#> [23] "odor=almond" "odor=anise"
#> [25] "odor=creosote" "odor=fishy"
#> [27] "odor=foul" "odor=musty"
#> [29] "odor=none" "odor=pungent"
#> [31] "odor=spicy" "gill-attachment=attached"
#> [33] "gill-attachment=descending" "gill-attachment=free"
#> [35] "gill-attachment=notched" "gill-spacing=close"
#> [37] "gill-spacing=crowded" "gill-spacing=distant"
#> [39] "gill-size=broad" "gill-size=narrow"
#> [41] "gill-color=black" "gill-color=brown"
#> [43] "gill-color=buff" "gill-color=chocolate"
#> [45] "gill-color=gray" "gill-color=green"
#> [47] "gill-color=orange" "gill-color=pink"
#> [49] "gill-color=purple" "gill-color=red"
#> [51] "gill-color=white" "gill-color=yellow"
#> [53] "stalk-shape=enlarging" "stalk-shape=tapering"
#> [55] "stalk-root=bulbous" "stalk-root=club"
#> [57] "stalk-root=cup" "stalk-root=equal"
#> [59] "stalk-root=rhizomorphs" "stalk-root=rooted"
#> [61] "stalk-root=missing" "stalk-surface-above-ring=fibrous"
#> [63] "stalk-surface-above-ring=scaly" "stalk-surface-above-ring=silky"
#> [65] "stalk-surface-above-ring=smooth" "stalk-surface-below-ring=fibrous"
#> [67] "stalk-surface-below-ring=scaly" "stalk-surface-below-ring=silky"
#> [69] "stalk-surface-below-ring=smooth" "stalk-color-above-ring=brown"
#> [71] "stalk-color-above-ring=buff" "stalk-color-above-ring=cinnamon"
#> [73] "stalk-color-above-ring=gray" "stalk-color-above-ring=orange"
#> [75] "stalk-color-above-ring=pink" "stalk-color-above-ring=red"
#> [77] "stalk-color-above-ring=white" "stalk-color-above-ring=yellow"
#> [79] "stalk-color-below-ring=brown" "stalk-color-below-ring=buff"
#> [81] "stalk-color-below-ring=cinnamon" "stalk-color-below-ring=gray"
#> [83] "stalk-color-below-ring=orange" "stalk-color-below-ring=pink"
#> [85] "stalk-color-below-ring=red" "stalk-color-below-ring=white"
#> [87] "stalk-color-below-ring=yellow" "veil-type=partial"
#> [89] "veil-type=universal" "veil-color=brown"
#> [91] "veil-color=orange" "veil-color=white"
#> [93] "veil-color=yellow" "ring-number=none"
#> [95] "ring-number=one" "ring-number=two"
#> [97] "ring-type=cobwebby" "ring-type=evanescent"
#> [99] "ring-type=flaring" "ring-type=large"
#> [101] "ring-type=none" "ring-type=pendant"
#> [103] "ring-type=sheathing" "ring-type=zone"
#> [105] "spore-print-color=black" "spore-print-color=brown"
#> [107] "spore-print-color=buff" "spore-print-color=chocolate"
#> [109] "spore-print-color=green" "spore-print-color=orange"
#> [111] "spore-print-color=purple" "spore-print-color=white"
#> [113] "spore-print-color=yellow" "population=abundant"
#> [115] "population=clustered" "population=numerous"
#> [117] "population=scattered" "population=several"
#> [119] "population=solitary" "habitat=grasses"
#> [121] "habitat=leaves" "habitat=meadows"
#> [123] "habitat=paths" "habitat=urban"
#> [125] "habitat=waste" "habitat=woods"
#>
colnames(dtrain)
#> [1] "cap-shape=bell" "cap-shape=conical"
#> [3] "cap-shape=convex" "cap-shape=flat"
#> [5] "cap-shape=knobbed" "cap-shape=sunken"
#> [7] "cap-surface=fibrous" "cap-surface=grooves"
#> [9] "cap-surface=scaly" "cap-surface=smooth"
#> [11] "cap-color=brown" "cap-color=buff"
#> [13] "cap-color=cinnamon" "cap-color=gray"
#> [15] "cap-color=green" "cap-color=pink"
#> [17] "cap-color=purple" "cap-color=red"
#> [19] "cap-color=white" "cap-color=yellow"
#> [21] "bruises?=bruises" "bruises?=no"
#> [23] "odor=almond" "odor=anise"
#> [25] "odor=creosote" "odor=fishy"
#> [27] "odor=foul" "odor=musty"
#> [29] "odor=none" "odor=pungent"
#> [31] "odor=spicy" "gill-attachment=attached"
#> [33] "gill-attachment=descending" "gill-attachment=free"
#> [35] "gill-attachment=notched" "gill-spacing=close"
#> [37] "gill-spacing=crowded" "gill-spacing=distant"
#> [39] "gill-size=broad" "gill-size=narrow"
#> [41] "gill-color=black" "gill-color=brown"
#> [43] "gill-color=buff" "gill-color=chocolate"
#> [45] "gill-color=gray" "gill-color=green"
#> [47] "gill-color=orange" "gill-color=pink"
#> [49] "gill-color=purple" "gill-color=red"
#> [51] "gill-color=white" "gill-color=yellow"
#> [53] "stalk-shape=enlarging" "stalk-shape=tapering"
#> [55] "stalk-root=bulbous" "stalk-root=club"
#> [57] "stalk-root=cup" "stalk-root=equal"
#> [59] "stalk-root=rhizomorphs" "stalk-root=rooted"
#> [61] "stalk-root=missing" "stalk-surface-above-ring=fibrous"
#> [63] "stalk-surface-above-ring=scaly" "stalk-surface-above-ring=silky"
#> [65] "stalk-surface-above-ring=smooth" "stalk-surface-below-ring=fibrous"
#> [67] "stalk-surface-below-ring=scaly" "stalk-surface-below-ring=silky"
#> [69] "stalk-surface-below-ring=smooth" "stalk-color-above-ring=brown"
#> [71] "stalk-color-above-ring=buff" "stalk-color-above-ring=cinnamon"
#> [73] "stalk-color-above-ring=gray" "stalk-color-above-ring=orange"
#> [75] "stalk-color-above-ring=pink" "stalk-color-above-ring=red"
#> [77] "stalk-color-above-ring=white" "stalk-color-above-ring=yellow"
#> [79] "stalk-color-below-ring=brown" "stalk-color-below-ring=buff"
#> [81] "stalk-color-below-ring=cinnamon" "stalk-color-below-ring=gray"
#> [83] "stalk-color-below-ring=orange" "stalk-color-below-ring=pink"
#> [85] "stalk-color-below-ring=red" "stalk-color-below-ring=white"
#> [87] "stalk-color-below-ring=yellow" "veil-type=partial"
#> [89] "veil-type=universal" "veil-color=brown"
#> [91] "veil-color=orange" "veil-color=white"
#> [93] "veil-color=yellow" "ring-number=none"
#> [95] "ring-number=one" "ring-number=two"
#> [97] "ring-type=cobwebby" "ring-type=evanescent"
#> [99] "ring-type=flaring" "ring-type=large"
#> [101] "ring-type=none" "ring-type=pendant"
#> [103] "ring-type=sheathing" "ring-type=zone"
#> [105] "spore-print-color=black" "spore-print-color=brown"
#> [107] "spore-print-color=buff" "spore-print-color=chocolate"
#> [109] "spore-print-color=green" "spore-print-color=orange"
#> [111] "spore-print-color=purple" "spore-print-color=white"
#> [113] "spore-print-color=yellow" "population=abundant"
#> [115] "population=clustered" "population=numerous"
#> [117] "population=scattered" "population=several"
#> [119] "population=solitary" "habitat=grasses"
#> [121] "habitat=leaves" "habitat=meadows"
#> [123] "habitat=paths" "habitat=urban"
#> [125] "habitat=waste" "habitat=woods"
colnames(dtrain) <- make.names(seq_len(ncol(train$data)))
print(dtrain, verbose = TRUE)
#> <lgb.Dataset>
#> Public:
#> construct: function ()
#> create_valid: function (data, label = NULL, weight = NULL, group = NULL, init_score = NULL,
#> dim: function ()
#> finalize: function ()
#> get_colnames: function ()
#> get_feature_num_bin: function (feature)
#> get_field: function (field_name)
#> get_params: function ()
#> initialize: function (data, params = list(), reference = NULL, colnames = NULL,
#> save_binary: function (fname)
#> set_categorical_feature: function (categorical_feature)
#> set_colnames: function (colnames)
#> set_field: function (field_name, data)
#> set_reference: function (reference)
#> slice: function (idxset)
#> update_params: function (params)
#> Private:
#> categorical_feature: NULL
#> colnames: X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 X11 X12 X13 X14 X15 X16 X ...
#> free_raw_data: TRUE
#> get_handle: function ()
#> handle: lgb.Dataset.handle
#> info: list
#> params: list
#> predictor: NULL
#> raw_data: NULL
#> reference: NULL
#> set_predictor: function (predictor)
#> used_indices: NULL
#> version: 1
# }