Documents as multiple overlapping windows into grids of counts Documents as multiple overlapping windows into grids of counts
Paper summary This paper describes a creative alternative for topic modeling: mixed-membership on a "counting grid." The advantage of this approach seems to be that you can move smoothly across the grid, achieving a high effective number of topics while the spatial smoothing prevents overfitting. The disadvantage seems to be that there are more parameters (grid dimension and size, and window size). A variational inference procedure that is somewhat to LDA is possible, although no speed/complexity comparisons are provided. The spatial nature of the approach has potential advantages for visualization as well.

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