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fix symbolic zero handling in sub transpose

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fixes #433
This commit is contained in:
Matthew Johnson 2019-02-22 20:42:07 -08:00
parent f08c3b746f
commit 1171626b99
1 changed files with 1 additions and 1 deletions
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jax/lax.py
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@ -1363,7 +1363,7 @@ ad.primitive_transposes[add_p] = _add_transpose
def _sub_transpose(t, x, y):
assert x is None and y is None # computation must be linear, not affine
return [t, neg(t)]
return [t, neg(t) if t is not ad_util.zero else ad_util.zero]
sub_p = standard_binop([_num, _num], 'sub')
ad.defjvp(sub_p,