| Class | Description | 
|---|---|
| BinaryBlockInputFormat | Custom binary block input format to return the custom record reader. | 
| BinaryBlockRecordReader | Custom record reader for binary block. | 
| ByteBufferDataInput | |
| CollectionUtils | |
| CommonThreadPool | This common thread pool provides an abstraction to obtain a shared
 thread pool, specifically the ForkJoinPool.commonPool, for all requests
 of the maximum degree of parallelism. | 
| DataConverter | This class provides methods to read and write matrix blocks from to HDFS using different data formats. | 
| DnnUtils | |
| FastBufferedDataInputStream | |
| FastBufferedDataOutputStream | This buffered output stream is essentially a merged version of
 BufferedOutputStream and DataOutputStream, wrt SystemDS requirements. | 
| FastStringTokenizer | This string tokenizer is essentially a simplified StringTokenizer. | 
| HDFSTool | |
| IndexRange | |
| InputStreamInputFormat | Custom input format and record reader to redirect common implementation of csv read 
 over record readers (which are required for the parallel readers) to an input stream. | 
| LocalFileUtils | |
| LongLongDoubleHashMap | This native long long - double hashmap is specifically designed for
 ctable operations which only require addvalue - extract semantics. | 
| LongLongDoubleHashMap.ADoubleEntry | |
| NormalPRNGenerator | Class that can generate a stream of random numbers from standard 
 normal distribution N(0,1). | 
| PoissonPRNGenerator | Class that can generate a stream of random numbers from Poisson
 distribution with specified mean. | 
| PRNGenerator | |
| ProgramConverter | Program converter functionalities for 
   (1) creating deep copies of program blocks, instructions, function program blocks, and 
   (2) serializing and parsing of programs, program blocks, functions program blocks. | 
| Py4jConverterUtils | Utils for converting python data to java. | 
| RandNPair | Class that generates a pair of random numbers from standard normal 
 distribution N(0,1). | 
| SortUtils | Utilities for sorting, primarily used for SparseRows. | 
| UniformPRNGenerator | |
| UtilFunctions | 
| Enum | Description | 
|---|---|
| LongLongDoubleHashMap.EntryType | 
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