An experimental port to rust from c# dnn code based on articles :
https://visualstudiomagazine.com/articles/2015/04/01/back-propagation-using-c.aspx
versions
0.1.0
initial port
0.1.1
rand -> oorandom
add benchmark tanh
more costants for array use to see speedup
simplify & clean
change for to iterator (for_each)
apply clippy suggests
new faster tanh
speedup from 26s -> 5secs : 5X more fast \