A DBN-Based Deep Neural Network Model with Multitask Learning for Online Air Quality Prediction

Figure 2

A 2-layer deep belief network that is stacked by two RBMs contains a lay of visible units and two layers of hidden units. Where and are the state vectors of the hidden layers, is the state vector of the visible layer, and are the matrices of symmetrical weights, and are the bias vector of the hidden layers, and is the bias vector of the visible layer.