This is now properly done, although the example has been moved. I rewrote the knapsack 'walkthrough' as a project-team allocation example and made particular mention of building a sparse index up-front. Also mentioned sparsity as a key issue on the performance page of the docs.
Thanks @Dr-Irv for raising this point around sparsity early on, it's an important one to clarify.
This is now properly done, although the example has been moved. I rewrote the knapsack 'walkthrough' as a project-team allocation example and made particular mention of building a sparse index up-front. Also mentioned sparsity as a key issue on the performance page of the docs.
Thanks @Dr-Irv for raising this point around sparsity early on, it's an important one to clarify.