Adds the option to do the evaluation on the test set on the 'allreduced' weights. The old behaviour is still available by setting the --centralized_test_eval to 0. It is also possible to do the evaluation on the trainset with the 'allreduced' weights by setting --centralized_train_eval to 1. However, this is not recommended since it takes significantly longer.
The final weights of each node are now stored in a folder called 'weights' inside the log directory.
The plotting functions are updated to handle the new log files.
After 50 global epochs, testing will only happen during every second global epoch.
Includes fixes for Shakespeare. The code for the testset was wrongly used for the trainset. The size of the trainset has been further reduced to 97545 samples.