Why the ellipses? It's not like they're sweeping this under the rug, it's pretty explicitly stated for which optimizations this applies. It's also a perfectly standard optimization strategy.
Their second example features it for example, but as an additional optimization that saves memory. The compute optimization part doesn't need this, and is what brings the little over an order of magnitude speedup.
Their second example features it for example, but as an additional optimization that saves memory. The compute optimization part doesn't need this, and is what brings the little over an order of magnitude speedup.