Training LDCRF model on unsegmented sequences using connectionist temporal classification
Many machine learning problems such as speech recognition, gesture recognition, and handwriting recognition are concerned with simultaneous segmentation and labeling of sequence data. Latent dynamic conditional random field (LDCRF) is a well known discriminative method that has been successfully used for this task. However, LDCRF can only be trained with pre segmented data sequences in which the label of each frame is available apriori. In the realm of neural networks, the invention of connectionist temporal classification (CTC) made it possible to train recurrent neural networks on unsegmented sequences with great success. In this paper, we use CTC to train an LDCRF model on unsegmented sequences. Experimental results on two gesture recognition tasks show that the proposed method outperforms LDCRFs, hidden Markov models, and conditional random fields.
2016 6th International Conference on Computer and Knowledge Engineering (ICCKE)