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Monthly Archives: June 2015
Regressionguided Generative Models
A generative model is pretty pointless on its own unless the generative structure itself holds intrinsic interest. Hence, papers justify their generative models either by comparing its predictive performance against another model or by extending the model to accommodate for … Continue reading
Topic Coherence
Evaluating unsupervised topic models is tricky business. If the resulting model is not employed in retrieval, classification, or regression there really is no way of convincing someone of the model’s worth. You may, rightly, say that there is no use … Continue reading
Starting PartofSpeech Tagging
This is by no means the latest on the subject of probabilistic partofspeech tagging of documents but nevertheless provides a good starting point to look at the basic model along with training and testing data. This paper [1] takes a … Continue reading
Adding (more Relaxed) Constraints during Model Inference
In the previous post on posterior regularization we saw how to specify constraints during the step of expectation maximization that would otherwise be difficult to incorporate into the model itself. The constraints took the following form where we specified our … Continue reading
Adding Constraints during Model Inference
Coming up with a probabilistic model and its inference procedure is only half the work because it’s well known that just a single run of the inference procedure is hardly likely to give you a satisfactory answer. Out of the … Continue reading
Modeling and Indexing
It has been welltested in the realworld and is generally accepted that simple models of indexing perform really well. They have no problems scaling or dealing with gigantic vocabularies. The biggest downside to them is that they can only match … Continue reading