[spam] [personal] perceiver model notes

[Undiscussed Horrific Abuse, One Victim & Survivor of]

both tests passing, now to normalise things a bit. might be a little
hard to rewrite the torch scan() shim to match the approach that works
with jax

commit b60bc067e16c717fc6632d862f1de275007aa47e (HEAD ->
return_weights, origin/return_weights)
Date:   Fri Jan 28 05:43:46 2022 +0000

    jax return_weights working, commented draft statements left in
source, implementations not normalised