{HEAD ~ The second set} of {TAIL ~ data} is a measured data but is not used for training the neural network 
of
{ HEAD ~ The second set } of { TAIL ~ data } is a measured data but is not used for training the neural network
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH