b12074

delta_net_base: refactor conv state (#30878)

• delta_net: access conv state via views

• fix sm tensor

• delta_net: fill the conv slot index on the host

The rollback slot index of the conv windows is a constant per graph
shape. It is now an I32 input of the recurrent memory filled on the
host, instead of an arange and an argsort computed on the device, and
the meta backend no longer needs a mirrored split for ARANGE.

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Co-authored-by: Pascal admin@serveurperso.com

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