imfilter inaccuracy problem about imagefiltering.jl HOT 2 CLOSED

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  isapprox(x, y; rtol::Real=atol>0 ? 0 : √eps, atol::Real=0, nans::Bool=false, norm::Function)

  Inexact equality comparison: true if norm(x-y) <= max(atol, rtol*max(norm(x), norm(y))). The default atol is zero and the default rtol depends on the types of x and y.
  The keyword argument nans determines whether or not NaN values are considered equal (defaults to false).

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julia> @test imfilter(x,reflect(∇x),"circular") ≈ zeros(5,5) atol=1e-12
Test Passed