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From "Takuya Kitazawa (JIRA)" <>
Subject [jira] [Comment Edited] (HIVEMALL-74) Implement pLSA algorithm
Date Wed, 12 Apr 2017 02:22:41 GMT


Takuya Kitazawa edited comment on HIVEMALL-74 at 4/12/17 2:22 AM:

There are several incremental variants of pLSA.

One is called *fold-in* which re-runs EM steps for new documents *by fixing P(w|z)*. This
strategy is described in the original papers, but we have no way to update *P(w|z)* for newly
observed documents. So, it does not fit to our purpose.

Incremental methods which update P(w|z) are described in: "Incremental Probabilistic Latent
Semantic Analysis for Automatic Question Recommendation"
(Table 1 in the paper compares different algorithms); we will implement one of the three incremental
variants, *IPLSA*, *MAP-PLSA* and *Our method*, in Hivemall.

was (Author: takuti):
Online PLSA

> Implement pLSA algorithm
> ------------------------
>                 Key: HIVEMALL-74
>                 URL:
>             Project: Hivemall
>          Issue Type: Wish
>            Reporter: Makoto Yui
>            Priority: Minor
>              Labels: Algorithm
> Support pLSA [1].
> [1] Thomas Hofmann, "Collaborative Filtering via Gauusian Probabilistic Latent Semantic
Analysis", Proc. SIGIR, 2003.

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