Keras - Loss and Metric calculated differently?

Question

I have a model in Keras which I\'m optimizing the mean squared error. However, if I use the same code as in losses.py from Keras in the metric, I get a differen

Answer 1

Remember - that if you use any kind of regularization - it affects your loss. Your actual loss is equal to:

loss = mse + regularization

and this is where your discrepancy comes from.