Siemens Medical Solutions Usa, Inc.

Oksana Yakhnenko

Radu Stefan Niculescu

Romer E Rosales

Lucian Vlad Lita

A method for sequence tagging medical patient records includes providing a labeled corpus of sentences taken from a set of medical records, initializing generative parameters &#x3b8; and discriminative parameters {tilde over (&#x3b8;)}, providing a functional LL&#x2212;C&#xd7;Penalty, where LL is a log-likelihood function where em=1&#x2212;&#x3a3;p(x|y), e{tilde over (m)}=1&#x2212;&#x3a3;{tilde over (p)}(x|y) are emission probability constraints, tr=1&#x2212;&#x3a3;p(y|y), t{tilde over (r)}=1&#x2212;&#x3a3;{tilde over (p)}(y|y) are transition probability constraints, and extracting gradients of LL&#x2212;C&#xd7;Penalty with respect to the transition and emission probabilities and solving &#x3b8;*,{tilde over (&#x3b8;)}*that maximize LL&#x2212;C&#xd7;Penalty, initializing a new iteration with &#x3b8;*,{tilde over (&#x3b8;)}* and incrementing C and repeating until solutions have converged, where parameters &#x3b8;,{tilde over (&#x3b8;)} are the probabilities that a new sentence X' is labeled as Y&#x2032;.

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Ames, IA, United States of America

Oksana Yakhnenko