Add tests

Author: gdalle

DifferentiationInterface/ext/DifferentiationInterfaceFiniteDiffExt/onearg.jl

@@ -27,7 +27,7 @@ function DI.prepare_pushforward_nokwarg(
     absstep = if isnothing(backend.absstep)
         relstep
     else
-        backend.relstep
+        backend.absstep
     end
     dir = backend.dir
     return FiniteDiffOneArgPushforwardPrep(_sig, cache, relstep, absstep, dir)
@@ -144,7 +144,7 @@ function DI.prepare_derivative_nokwarg(
     absstep = if isnothing(backend.absstep)
         relstep
     else
-        backend.relstep
+        backend.absstep
     end
     dir = backend.dir
     return FiniteDiffOneArgDerivativePrep(_sig, cache, relstep, absstep, dir)
@@ -269,7 +269,7 @@ function DI.prepare_gradient_nokwarg(
     absstep = if isnothing(backend.absstep)
         relstep
     else
-        backend.relstep
+        backend.absstep
     end
     dir = backend.dir
     return FiniteDiffGradientPrep(_sig, cache, relstep, absstep, dir)
@@ -359,7 +359,7 @@ function DI.prepare_jacobian_nokwarg(
     absstep = if isnothing(backend.absstep)
         relstep
     else
-        backend.relstep
+        backend.absstep
     end
     dir = backend.dir
     return FiniteDiffOneArgJacobianPrep(_sig, cache, relstep, absstep, dir)
@@ -463,7 +463,7 @@ function DI.prepare_hessian_nokwarg(
     relstep_h = if isnothing(backend.relstep)
         default_relstep(fdhtype(backend), eltype(x))
     else
-        backend.relstep
+        backend.absstep
     end
     absstep_g = isnothing(backend.absstep) ? relstep_g : backend.absstep
     absstep_h = isnothing(backend.absstep) ? relstep_h : backend.absstep

DifferentiationInterface/ext/DifferentiationInterfaceFiniteDiffExt/twoarg.jl

@@ -31,7 +31,7 @@ function DI.prepare_pushforward_nokwarg(
     absstep = if isnothing(backend.absstep)
         relstep
     else
-        backend.relstep
+        backend.absstep
     end
     dir = backend.dir
     return FiniteDiffTwoArgPushforwardPrep(_sig, cache, relstep, absstep, dir)
@@ -175,7 +175,7 @@ function DI.prepare_derivative_nokwarg(
     absstep = if isnothing(backend.absstep)
         relstep
     else
-        backend.relstep
+        backend.absstep
     end
     dir = backend.dir
     return FiniteDiffTwoArgDerivativePrep(_sig, cache, relstep, absstep, dir)
@@ -295,7 +295,7 @@ function DI.prepare_jacobian_nokwarg(
     absstep = if isnothing(backend.absstep)
         relstep
     else
-        backend.relstep
+        backend.absstep
     end
     dir = backend.dir
     return FiniteDiffTwoArgJacobianPrep(_sig, cache, relstep, absstep, dir)

DifferentiationInterface/test/Back/FiniteDiff/test.jl

@@ -72,3 +72,35 @@ end
         logging=LOGGING,
     )
 end;
+
+@testset "Step size" begin  # fix 811
+    backend = AutoFiniteDiff(; absstep=1000, relstep=0.1)
+    preps = [
+        prepare_pushforward(identity, backend, 1.0, (1.0,))
+        prepare_pushforward(copyto!, [0.0], backend, [1.0], ([1.0],))
+        prepare_derivative(identity, backend, 1.0)
+        prepare_derivative((y, x) -> y .= x, [0.0], backend, 1.0)
+        prepare_gradient(sum, backend, [1.0])
+        prepare_jacobian(identity, backend, [1.0])
+        prepare_jacobian(copyto!, [0.0], backend, [1.0])
+    ]
+    for prep in preps
+        @test prep.relstep == 0.1
+        @test prep.absstep == 1000
+    end
+
+    backend = AutoFiniteDiff(; relstep=0.1)
+    preps = [
+        prepare_pushforward(identity, backend, 1.0, (1.0,))
+        prepare_pushforward(copyto!, [0.0], backend, [1.0], ([1.0],))
+        prepare_derivative(identity, backend, 1.0)
+        prepare_derivative((y, x) -> y .= x, [0.0], backend, 1.0)
+        prepare_gradient(sum, backend, [1.0])
+        prepare_jacobian(identity, backend, [1.0])
+        prepare_jacobian(copyto!, [0.0], backend, [1.0])
+    ]
+    for prep in preps
+        @test prep.relstep == 0.1
+        @test prep.absstep == 0.1
+    end
+end