observation with one or multiple features* attributes which have the types expected by the roots in proper order (i.e: float[], SparseF[], SparseFG[], custom roots types...)
array of last layer neurons values
struct O { float[] features_foo; } net.predict(O([1.2f, 0.7f]));
Compute the prediction of the net for $(PARAM v). Runs forward-propagation and outputs the predicted vector.