VistA-HealtheVet Monograph 2008-2009, Department of ...

Fourth, we apply an information-theoretic machine learning technique called pointwise mutual information (Church et al., 1991), or PMI, over the corpus of profiles to learn the semantic relatedness of every possible pair of features (interests or identity-descriptors). For any two features f1 and f2, their PMI is given in equation (1). (1) ................
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