SparseTensor, with indices sorted in row-major order.
validate_indices
Whether to validate the order and range of sparse indices in a. Note that setting this to false allows for undefined behavior when calling this function with invalid indices.
Returns
int32Tensor of set sizes. For a ranked n, this is a Tensor with rank n-1, and the same 1st n-1 dimensions as a. Each value is the number of unique elements in the corresponding [0...n-1] dimension of a.