Deep Boltzmann Machines for i-Vector Based Audio-Visual Person Identification

We propose an approach using DBM-DNNs for i-vector based audio-visual person identification. The unsupervised training of two Deep Boltzmann Machines DBMspeech and DBMface is performed using unlabeled audio and visual data from a set of background subjects. The DBMs are then used to initialize two corresponding DNNs for classification, referred to as the DBM-DNNspeech and DBM-DNNface in this paper. The DBM-DNNs are discriminatively fine-tuned using the back- propagation on a set of training data and evaluated on a set of test data from the target subjects. We compared their performance with the cosine distance (cosDist) and the state-of-the-art DBN-DNN classifier. We also tested three different configurations of the DBM-DNNs. We show that DBM-DNNs with two hidden layers and 800 units in each hidden layer achieved best identification performance for 400 dimensional i-vectors as input. Our experiments were carried out on the challenging MOBIO dataset. © Springer International Publishing Switzerland 2016.