How to use the elephas.java.java_classes.DataTypeUtil.getDTypeForName function in elephas

def to_numpy(nd4j_array):
    """ Convert an ND4J array to a numpy array
    :param nd4j_array:
    :return:
    """
    buff = nd4j_array.data()
    address = buff.pointer().address()
    type_name = java_classes.DataTypeUtil.getDtypeFromContext()
    data_type = java_classes.DataTypeUtil.getDTypeForName(type_name)
    mapping = {
        'double': ctypes.c_double,
        'float': ctypes.c_float
    }
    Pointer = ctypes.POINTER(mapping[data_type])
    pointer = ctypes.cast(address, Pointer)
    np_array = np.ctypeslib.as_array(pointer, tuple(nd4j_array.shape()))
    return np_array

def get_context_dtype():
    """Returns the nd4j dtype
    """
    dtype = java_classes.DataTypeUtil.getDtypeFromContext()
    return java_classes.DataTypeUtil.getDTypeForName(dtype)