Update gradients.jl

Author: ChrisRackauckas

src/gradients.jl

@@ -247,7 +247,7 @@ function finite_difference_gradient!(
             if ArrayInterface.fast_scalar_indexing(c2)
                 epsilon = ArrayInterface.allowed_getindex(c2, i) * dir
             else
-                epsilon = compute_epsilon(fdtype, x, relstep, absstep, dir) * dir
+                epsilon = compute_epsilon(fdtype, one(eltype(x)), relstep, absstep, dir) * dir
             end
             c1_old = ArrayInterface.allowed_getindex(c1, i)
             ArrayInterface.allowed_setindex!(c1, c1_old + epsilon, i)
@@ -277,7 +277,7 @@ function finite_difference_gradient!(
             if ArrayInterface.fast_scalar_indexing(c2)
                 epsilon = ArrayInterface.allowed_getindex(c2, i) * dir
             else
-                epsilon = compute_epsilon(fdtype, x, relstep, absstep, dir) * dir
+                epsilon = compute_epsilon(fdtype, one(eltype(x)), relstep, absstep, dir) * dir
             end
             c1_old = ArrayInterface.allowed_getindex(c1, i)
             ArrayInterface.allowed_setindex!(c1, c1_old + epsilon, i)