@staticmethod
def get_highdim(dtype=None):
    """
        Return mapping for high dimensional classes.  Return only for datatype
        if dtype is set.  Else return full map.

        :param dtype: optional datatype (e.g. cnv)
        :return: dict with mapping, or class.
        """
    from ..highdim.CopyNumberVariation import CopyNumberVariation
    from ..highdim.ReadCounts import ReadCounts
    from ..highdim.Expression import Expression
    from ..highdim.Mirna import Mirna
    from ..highdim.Proteomics import Proteomics
    map_d = {'rnaseq': ReadCounts, 'cnv': CopyNumberVariation, 'expression':
        Expression, 'proteomics': Proteomics, 'mirna': Mirna}
    if dtype:
        return map_d[dtype]
    else:
        return map_d
