2. The method of claim 1 and further comprising: applying discriminative training framework to probabilistic latent semantic analysis to create a discriminatively trained probabilistic latent semantic analysis similarity measure .
2. The method of claim 1 and further comprising: applying discriminative training framework to probabilistic latent semantic analysis to create a discriminatively trained probabilistic latent semantic analysis similarity measure . 3. The method of claim 2 and further comprising: applying discriminative training framework to latent semantic analysis to create a discriminatively trained latent semantic analysis similarity measure.