From ddec40847c8552459960ecb78c28b2a18b195a79 Mon Sep 17 00:00:00 2001
From: Hong Ge <hg344@cam.ac.uk>
Date: Wed, 23 Jan 2019 16:48:26 +0000
Subject: [PATCH] Update ad.jl (#656)

---
 src/core/ad.jl | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/src/core/ad.jl b/src/core/ad.jl
index 3005e5535..f3b07cbf1 100644
--- a/src/core/ad.jl
+++ b/src/core/ad.jl
@@ -163,9 +163,6 @@ function gradient_reverse(
     return l, ∂l∂θ
 end
 
-import Base: <=
-<=(a::Tracker.TrackedReal, b::Tracker.TrackedReal) = a.data <= b.data
-
 function verifygrad(grad::AbstractVector{<:Real})
     if any(isnan, grad) || any(isinf, grad)
         @warn("Numerical error has been found in gradients.")