A faster way to generate thin plate splines

In Evading real-time person detectors by adversarial t-shirt1, Xu and coauthors show that the adversarial patch attack described by Thys, Van Ranst, and Goedemé2 is less successful when applied to flexible media like fabric, due to the warping and folding that occurs.

low success rate with adversarial patch from AUTHORS

They propose to remedy this failure …

A faster way to generate lagged values

At Novi Labs, we spend a lot of time working with timeseries data. Generically speaking, these data are formatted something like this:

id  time  value
a     0      1
a     1      2
a     2      3
b     0      4
b     1      5
c     0      6

where we have individual sensors represented by …