is eigen dense-sparse matrix product threaded?

问题

I know that sparse-dense product is threaded according to the documentation:

https://eigen.tuxfamily.org/dox/TopicMultiThreading.html

What about dense-sparse?

回答1:

To be more precise, sparse-dense product is multithreaded only if the left-hand-side sparse matrix is row-major. Conversely, dense-sparse products is multithreaded if the right-hand-side sparse matrix is column-major.

来源：https://stackoverflow.com/questions/49959657/is-eigen-dense-sparse-matrix-product-threaded