Update Weights Operation

[EscVM]

Hi @eric-mitchell,

Thank you for the repo and the great paper. I was looking at your code and I have a doubt on this line of code: why is there a plus? Shouldn't be a minus? As you also wrote in the paper, the final edited weights should be:

$$\tilde{W} = W_l − α * \tilde{\nabla} W_l$$

Thanks for your help.