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