code: public static RegressionDataSet loadRegression(InputStream inRaw, DataStore backingStore) throws IOException
      {
          return (RegressionDataSet) load(inRaw, backingStore);
      }
docs: Loads in a JSAT dataset as a {@link RegressionDataSet}. An exception
  will be thrown if the original dataset in the file was not a
  {@link RegressionDataSet}.
  
  @param inRaw the input stream, caller should buffer it
  @param backingStore the data store to put all data points in
  @return a RegressionDataSet object
  @throws IOException
  @throws ClassCastException if the original dataset was a not a RegressionDataSet