question: public static File createMinimalSplit ( String inputFolder , int numFolds , int numAvailableJCas , boolean isSequence ) throws Exception { File outputFolder = new File ( inputFolder , "output" ) ; int splitNum = ( int ) Math . ceil ( numFolds / ( double ) numAvailableJCas ) ; CollectionReaderDescription createReader = CollectionReaderFactory . createReaderDescription ( BinaryCasReader . class , BinaryCasReader . PARAM_SOURCE_LOCATION , inputFolder , BinaryCasReader . PARAM_PATTERNS , "*.bin" ) ; AnalysisEngineDescription multiplier = AnalysisEngineFactory . createEngineDescription ( FoldClassificationUnitCasMultiplier . class , FoldClassificationUnitCasMultiplier . PARAM_REQUESTED_SPLITS , splitNum , FoldClassificationUnitCasMultiplier . PARAM_USE_SEQUENCES , isSequence ) ; AnalysisEngineDescription xmiWriter = AnalysisEngineFactory . createEngineDescription ( BinaryCasWriter . class , BinaryCasWriter . PARAM_TARGET_LOCATION , outputFolder . getAbsolutePath ( ) , BinaryCasWriter . PARAM_FORMAT , "6+" ) ; AnalysisEngineDescription both = AnalysisEngineFactory . createEngineDescription ( multiplier , xmiWriter ) ; SimplePipeline . runPipeline ( createReader , both ) ; isNumberOfCasCreatedLargerEqualNumFolds ( outputFolder , numFolds ) ; return outputFolder ; }
target:  Takes the available CAS and creates more cases from them to conform to the minimal requested amount of CAS objects to have sufficient for running a cross-validation. Computes a rule-of-thumb value to split each of the found cas into N sub-cases and the end the total created number is compared to the requested number of CAS and an exception thrown if too few CAS were created.