Output entropy when there is a column named 'ENTROPY'

decoder/include/Beam.hpp

decoder/src/Beam.cpp

decoder/src/Decoder.cpp

reading_machine/include/Action.hpp

reading_machine/include/Transition.hpp

reading_machine/src/Action.cpp

reading_machine/src/Transition.cpp

torch_modules/include/NeuralNetwork.hpp

torch_modules/src/NeuralNetwork.cpp

trainer/src/Trainer.cpp