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Add transpose rule for stop_gradient #68

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Add transpose rule for stop_gradient #68

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11 changes: 11 additions & 0 deletions optimistix/_ad.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,8 @@
import lineax as lx
from equinox.internal import ω
from jaxtyping import PyTree
from jax.interpreters import ad
from jax._src.ad_util import stop_gradient_p

from ._misc import tree_full_like

Expand Down Expand Up @@ -110,3 +112,12 @@ def _for_jvp(_diff):
t_residual = tree_full_like(residual, 0)

return (root, residual), (t_root, t_residual)


# Work arond JAX issue #22011,
# as well as https://github.com/patrick-kidger/diffrax/pull/387#issuecomment-2174488365
def stop_gradient_transpose(ct, x):
return ct,


ad.primitive_transposes[stop_gradient_p] = stop_gradient_transpose