if (nonEmptySeriesList.size() == 0) {
dataEmpty = true;
return;
}
Series firstSeries = nonEmptySeriesList.get(0);
Tuple[] tuples = firstSeries.getTuples();
Tuple firstTuple = tuples[0];
Object key = firstTuple.getKey();
if (key instanceof Number) {
modelType = ModelType.Number;