New loss function knob
Added a new loss function option based on code from @msokolof. You can now specify epsilon for your loss function:
loss = Loss() # Uses default epsilon of 1e-5
loss = Loss(1e-4) # Setting epsilon
loss = Loss(epsilon=1e-3) # You can be explicit if you want, too
Since the loss function is not needed when loading a model, it doesn't need to be stored directly.
Edited by Henry Fredrick Schreiner