added some __init__ files

README.md

data/__init__.py

forrest-test.ipynb

metric/__init__.py

network-test.ipynb

nn/__init__.py

nn/graph.py

nn/hopfield.py

nn/linear.py

nn/regularization.py

nn/transposed.py

rf/__init__.py

som-test.ipynb

som/__init__.py

som/som.py

test.json

tree-test.ipynb

utility/__init__.py