RaggedIndexedContiguousArray.
ndim
The number of dimensions of the uncompressed data.
Examples:
>>> d.shape (73, 96) >>> d.ndim 2 >>> d.size 7008
>>> d.shape (1, 1, 1) >>> d.ndim 3 >>> d.size 1
>>> d.shape () >>> d.ndim 0 >>> d.size 1