US Patent 10580432 Speech recognition using connectionist temporal classification

Generally discussed herein are devices, systems, and methods for speech recognition. Processing circuitry can implement a connectionist temporal classification (CTC) neural network (NN) including an encode NN to receive an audio frame and generate a current encoded hidden feature vector, an attend NN to generate, based on a current encoded hidden feature vector and a first context vector from a previous time slice, a weight vector indicating an amount the current encoded hidden feature vector, a previous encoded hidden feature vector, and a future encoded hidden feature vector from a future time slice contribute to a current, second context vector, an annotate NN to generate the current, second context vector based on the weight vector, the current encoded hidden feature vector, the previous encoded hidden feature vector, and the future encoded hidden feature vector, and a normal NN to generate a normalized output vector based on the context vector.