constants and in this case the model has kind of pathologically learned to have its output depend a lot more on the precise randomly sampled value of that mean and that standard deviation rather than paying attention to the individual values in the code so in the top we see a lot of very like orange images and in the bottom we see a lot of very green images so to fix that problem we are able to change two different versions of batch normalization that actually process every example in the same way the simplest of these is what we call