transform method
Implementation
List<int> transform(List<dynamic> values) {
_checkFitted();
return values.map((value) {
if (_labelToIndex.containsKey(value)) {
return _labelToIndex[value]!;
} else if (handleUnknown) {
return unknownValue;
} else {
throw ArgumentError('Unknown label: $value');
}
}).toList();
}