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<p><a href="page.php?w=machine_learning">machine learning</a> from text, <a href="page.php?w=bioinformatics">bioinformatics</a>, and related areas.</p>

<p>It is reported that the <a href="page.php?w=aspect_model">aspect model</a> used in the probabilistic latent semantic analysis has severe <a href="page.php?w=overfitting">overfitting</a> problems.</p>

<p><big>Extensions </big></p>
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* Hierarchical extensions:<br/>
** Asymmetric: MASHA ("Multinomial ASymmetric Hierarchical Analysis")<br/>
** Symmetric: HPLSA ("Hierarchical Probabilistic Latent Semantic</p><p>
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