1. Create an instance of NumberedFileInputSplit  to club all feature files together:

new NumberedFileInputSplit(FEATURE_DIR+"/%d.csv",0,3199);

2. Create an instance of NumberedFileInputSplit  to club all label files together:

new NumberedFileInputSplit(LABEL_DIR+"/%d.csv",0,3199);

3. Create record readers for features/labels:

SequenceRecordReader trainFeaturesReader = new CSVSequenceRecordReader(1, ",");
 trainFeaturesReader.initialize(new NumberedFileInputSplit(FEATURE_DIR+"/%d.csv",0,3199));
 SequenceRecordReader trainLabelsReader = new CSVSequenceRecordReader();
 trainLabelsReader.initialize(new NumberedFileInputSplit(LABEL_DIR+"/%d.csv",0,3199));