It's a little arbitrary. Look at the graph on page 6, there's no steep gap in the spectrum there. 16 just about the balance point

But there is a steep gap in the spectrum at 16 on page 7

That's the spectrum of LoRAs, which are LoW RAnk by design.

	▲	moi2388 7 hours ago \| parent [-]
		Yes. But from their paper: “In our analysis, we present compelling empirical evidence for the existence of universal subspaces within LoRA adapters across different modalities and tasks.” I also don’t understand what they write under figure 2, since resnet50 has 50 layers, not 31.