Deep neural networks 1 Drilling depth 1 Drilling methods 1 Drilling state identification algorithm 1 Identification algorithms 1 Infill drilling 1 Long short-term memory 1 Monitoring-while-drilling method Neural network model 1 Neural-networks 1 State identification 1 Vibration signal 1 While drillings 1 drilling depth 1 drilling state identification algorithm 1 monitoring-while-drilling method 1 neural network 1 vibration signals 1