use ZeroTangent for derivative of zero and one (#726)

oxinabox · web-flow · commit df672c3b86ae · 2023-07-14T22:51:39.000+08:00
* use ZeroTangent for derivative of zero and one

* bump version

* fix typo
diff --git a/Project.toml b/Project.toml
@@ -1,6 +1,6 @@
 name = "ChainRules"
 uuid = "082447d4-558c-5d27-93f4-14fc19e9eca2"
-version = "1.52.1"
+version = "1.53.0"
 
 [deps]
 Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"
diff --git a/src/rulesets/Base/base.jl b/src/rulesets/Base/base.jl
@@ -3,8 +3,8 @@
 
 @scalar_rule copysign(y, x) (ifelse(signbit(x)!=signbit(y), -one(y), +one(y)), NoTangent())
 
-@scalar_rule one(x) zero(x)
-@scalar_rule zero(x) zero(x)
+@scalar_rule one(x) ZeroTangent()
+@scalar_rule zero(x) ZeroTangent()
 @scalar_rule transpose(x) true
 
 # `adjoint`
