warning in spectral_normed_weight

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Hi! I've been using your implementation of SNGAN and I have some questions. If I follow the training procedure intrain.py, then the warning in the spectral_normed_weight function will print

Setting update_collection to None will make u being updated every W execution. This maybe undesirable. Please consider using a update collection instead.

I wonder if the warning was meaningful. I also found that the way you used the collection api is different in train.py and test_sn_implementation.py. Which way should I follow?

Thanks!