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support copy_p inverse rule #121

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support copy_p inverse rule #121

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18 changes: 18 additions & 0 deletions oryx/core/interpreters/inverse/rules.py
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Original file line number Diff line number Diff line change
Expand Up @@ -253,6 +253,24 @@ def convert_element_type_ildj(incells, outcells, *, new_dtype, **params):
ildj_registry[lax.convert_element_type_p] = convert_element_type_ildj


def copy_ildj(incells, outcells, **params):
"""InverseAndILDJ rule for copy primitive.

The copy primitive is an identity operation - it just copies a value without
transformation. The inverse is also an identity, and the ILDJ is 0 since
there's no change in volume.
"""
incell, = incells
outcell, = outcells
if incell.top() and not outcell.top():
# Forward evaluation: copy input to output
outcells = [InverseAndILDJ.new(lax.copy_p.bind(incell.val, **params))]
elif outcell.top() and not incell.top():
# Inverse: copy is its own inverse
incells = [InverseAndILDJ.new(outcell.val)]
return incells, outcells, None
ildj_registry[lax.copy_p] = copy_ildj

# Monkey patching JAX so we can define custom, more numerically stable inverses.
jax.scipy.special.expit = custom_inverse(jax.scipy.special.expit)
jax.scipy.special.logit = custom_inverse(jax.scipy.special.logit)
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