code: public static Pair<INDArray, INDArray> convertWritablesSequence(List<List<List<Writable>>> timeSeriesRecord) {
          return convertWritablesSequence(timeSeriesRecord,getDetails(timeSeriesRecord));
      }
docs: Convert the writables
  to a sequence (3d) data set,
  and also return the
  mask array (if necessary)
  @param timeSeriesRecord the input time series