Disclosed is a neural network training method and apparatus, and recognition method and apparatus. The neural network training apparatus receives data and train a neural network based on remaining hidden nodes obtained by excluding a reference hidden node from hidden nodes included in the neural network, wherein the reference hidden node maintains a value in a previous time interval until a subsequent time interval.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A method of training a neural network using learning data, the method comprising: selecting a reference hidden node from hidden nodes in the neural network; and training the neural network based on remaining hidden nodes obtained by excluding the reference hidden node from the hidden nodes, wherein the reference hidden node maintains a value in a previous time interval until a subsequent time interval. 2. The method of claim 1, wherein the selecting comprises randomly selecting the reference hidden node from the hidden nodes for each time interval. 3. The method of claim 1, wherein the reference hidden node maintains a long-term memory value included in a corresponding reference hidden node in the previous time interval until the subsequent time interval. 4. The method of claim 1, wherein the reference hidden node blocks a value input from a lower layer of a hidden layer comprising a corresponding reference hidden node. 5. The method of claim 1, wherein the reference hidden node blocks a value output to an upper layer of a hidden layer comprising a corresponding reference hidden node. 6. The method of claim 1, wherein the remaining hidden nodes are connected to hidden nodes of other time intervals comprising the previous time interval and the subsequent time interval. 7. The method of claim 1, wherein the learning data comprises sequential data comprising at least one of voice data, image data, biometric data, and handwriting data. 8. The method of claim 1, wherein the training comprises updating a connection weight included in the neural network based on a result of the training. 9. The method of claim 1, wherein the neural network is a recurrent neural network comprising hidden layers. 10. A recognition method comprising: receiving sequential data; and recognizing the sequential data using a neural network comprising hidden nodes, wherein the hidden nodes comprise a value of a corresponding hidden node in a time interval preceding a current time interval, and a value calculated based on a probability that the value of the corresponding hidden node is to be transferred until the current time interval, and wherein the neural network is trained based on remaining hidden nodes obtained by excluding a reference hidden node from the plurality of hidden nodes. 11. The method of claim 10, wherein, in a process of training the neural network, the reference hidden node is randomly selected from the hidden nodes for each time interval. 12. The method of claim 10, wherein, in a process of training the neural network, the reference hidden node maintains a value in a previous time interval until a subsequent time interval. 13. The method of claim 10, wherein, in a process of training the neural network, the remaining hidden nodes are connected to hidden nodes of other time intervals. 14. A non-transitory computer-readable storage medium comprising a program comprising instructions to cause a computer to perform the method of claim 1. 15. An apparatus for training a neural network using learning data, the apparatus comprising: a receiver configured to receive the learning data; and a trainer configured to train the neural network based on remaining hidden nodes obtained by excluding a reference hidden node from hidden nodes included in the neural network, wherein the reference hidden node maintains a value in a previous time interval until a subsequent time interval. 16. The apparatus of claim 15, wherein the reference hidden node is randomly selected and excluded from the hidden nodes for each time interval. 17. The apparatus of claim 15, wherein the reference hidden node maintains a long-term memory value included in a corresponding reference hidden node in the previous time interval. 18. The apparatus of claim 15, wherein the reference hidden node blocks a value input from a lower layer of a hidden layer comprising a corresponding reference hidden node. 19. The apparatus of claim 15, wherein the reference hidden node blocks a value output to an upper layer of a hidden layer comprising a corresponding reference hidden node. 20. A recognition apparatus comprising: a receiver configured to receive sequential data; and a recognizer configured to recognize the sequential data using a neural network comprising hidden nodes, wherein the hidden nodes comprise a value of a corresponding hidden node in a time interval preceding a current time interval and a value calculated based on a probability that the value of the corresponding hidden node is to be transferred until the current time interval, and wherein the neural network is trained based on remaining hidden nodes obtained by excluding a reference hidden node from the hidden nodes. 21. The apparatus of claim 20, wherein in a process of training the neural network, the reference hidden node is randomly selected from the hidden nodes for each time interval. 22. The apparatus of claim 20, wherein, in a process of training the neural network, the reference hidden node maintains a value in a previous time interval until a subsequent time interval. 23. The apparatus of claim 20, wherein, in a process of training the neural network, the remaining hidden nodes are connected to hidden nodes of other time intervals. 24. A method of training a neural network using learning data, the method comprising: training the neural network in a first time interval based on remaining hidden nodes obtained by excluding a reference hidden node from the hidden nodes, wherein the reference hidden node is selected from hidden nodes in the neural network; and training the neural network in a subsequent time interval, wherein the reference hidden node maintains a value in a previous time interval until a subsequent time interval.