new-labels.json: Fix syntax

say-imagenet-labels.py: Update to support multiple speakers

Add new labels file

SOM: Fix the batch-based training

SOM: Refactor to a batch-based SOM algorithm

hebbian_onehot: Update to new code in HebbianModel

Finish up make_plot(.) function

create_hebbian_model: Add argument for training or restoring

HebbianModel: Remove useless arguments from make_prediction_ functions

HebbianModel: Refactor make_prediction() function, add make_plot() function

HebbianModel.py: Refactor using propagate_activation(...) function

HebbianModel.py: Remove comment, refactor activation propagation

SOM.py: Vectorize get_activation() function

Add new evaluate functions

HebbianModel: Refactor evaluate() function