Scan/Sort Ops#

`associative_scan`	Applies the combine_fn to each elements with a carry in `input` tensors along the provided `axis` and update the carry
`bitonic_merge`
`cumprod`	Returns the cumprod of all elements in the `input` tensor along the provided `axis`
`cumsum`	Returns the cumsum of all elements in the `input` tensor along the provided `axis`
`histogram`	computes an histogram based on input tensor with num_bins bins, the bins have a width of 1 and start at 0.
`sort`
`topk`	Returns the k largest (or smallest) elements of the input tensor along the specified dimension.