DataSet (CF4J 2.3.0 API Documentation)

All Known Implementing Classes:

ManualDataSet, RandomSplitDataSet, TrainTestFilesDataSet
```
public interface DataSet
```
This interface works as a bridge between the raw file and the DataModel. This interface ensures collaborative filtering ratings separated into two groups: no-test and test. The ratings must be returned in DataSetEntries which structure is conformed by user, item and rating.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`int`	`getNumberOfRatings()`	This method indicates the number of (training) ratings.
`int`	`getNumberOfTestRatings()`	This method indicates the number of test ratings.
`Iterator<DataSetEntry>`	`getRatingsIterator()`	This method generates an iterator to navigate through the raw ratings stored in DataSetEntries.
`Iterator<DataSetEntry>`	`getTestRatingsIterator()`	This method generates an iterator to navigate through the raw test ratings stored in DataSetEntries.

- Method Detail
  - getRatingsIterator
```
Iterator<DataSetEntry> getRatingsIterator()
```
    This method generates an iterator to navigate through the raw ratings stored in DataSetEntries.
    
    Returns:
    
    Iterator of ratings
  - getNumberOfRatings
```
int getNumberOfRatings()
```
    This method indicates the number of (training) ratings.
    
    Returns:
    
    Number of (training) ratings
  - getTestRatingsIterator
```
Iterator<DataSetEntry> getTestRatingsIterator()
```
    This method generates an iterator to navigate through the raw test ratings stored in DataSetEntries.
    
    Returns:
    
    Iterator of test ratings
  - getNumberOfTestRatings
```
int getNumberOfTestRatings()
```
    This method indicates the number of test ratings.
    
    Returns:
    
    Number of test ratings