The present invention is directed to a spin transfer torque MRAM device having a perpendicular magnetic tunnel junction memory element. A feed-forward process is performed on each of the segments to generate a trellis for each of the segments. A search engine can execute queries based on output from the cascaded CRFs over an inverted index of a database, which can be based on one or more materialized views of the database. Feature selection and tracking are performed in real-time, and used to train a template-based classifier during a capture phase prompted by the user. In some embodiments, the selected carbon number may be 25.