Unified use of #sparseSoftmaxCrossEntropyWithLogits: in loss and learning graphs.
Unified use of #sparseSoftmaxCrossEntropyWithLogits: in loss and learning graphs.

This also means there's a single input for expectedLabel.
Also added a named subgraph for loss and learning parts, for nicer display

Cuis-Smalltalk/Machine-Learning,Cuis-Smalltalk/Machine-Learning,Cuis-Smalltalk/Machine-Learning