Mathrel function in backprop

5 - Backpropagation in Convolutional Neural Networks (OPTIONAL / UNGRADED)

One of the formulae for backprop is :-
dW[:,:,:,c] \mathrel{+}=

Can you point me to what mathrel{} is please?
I can’t find any reference to it or how it works

That is just a LaTeX rendering artifact. What they are trying to say is:

dW[:,:,:,c] += a_slice * dZ[i, h, w, c]

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Thanks Paul.
Confused the hell out of me!