Wei Zhang professional homepage; Zhang Wei, artificial intelligence, Deep Learning, Recurrent Neural Networks, Convolutional Neural Networks, Neural Turing Machines, Named Entity Recognition, Information Retrieval, Word sense disambiguation, Entity linking, artificial neural networks, natural language processing, natural language understanding, international business machines, IBM, Watson, IBM Watson, statistical learning and discovery, carnegie mellon university, language technologies institute, school of computer science, CMU, SCS, LTI, sequence labeling, hidden markov models, structured prediction, geospatial research, geo-coding, geocoding, geotagging, geo-tagging, geo-parsing, geoparsing, harbin institute of technology, computer science and engineering, computer vision, image captioning, robotics, reinforcement learning, multi-task learning, multi task learning, active learning, joint training