Abstract
We investigate compression-based learning for image classification tasks. These algorithms are claimed to approximate the Kolmogorov complexity of the difference between two object descriptions, but in practice are a measure over an induced feature space. We investigate if these algorithms can be improved via feature selection. Our experiments cover a corpus of legitimate websites and Phishing websites impersonating them; the task is to classify a webpage as either legitimate or a Phish. We perform feature selection in the feature space induced by a well-known compression algorithm (specifically, the entries of the compression dictionary). We then apply four well-known classification algorithms to the reduced feature sets, and conduct a Receiver Operating Characteristic analysis on them. We find that a subset of the features is sufficient for a near-perfect classification of these webpages.
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Notes
Note that for any pair of objects, there are two NCD values, as C(xy) ≠ C(yx) in general. Chen et al. [12] explored aggregating the values by their maximum or their mean; both yielded similar results. There is no way to simply pick one value, as we have no rationale to favour the xy or yx concatenation. Thus, after aggregation, there are 120 of these pairwise NCDs.
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This work was supported in part by the Natural Sciences and Engineering Research Council of Canada under Grant No. G121210906.
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Chen, TC., Stepan, T., Dick, S. et al. An investigation of implicit features in compression-based learning for comparing webpages. Pattern Anal Applic 19, 397–410 (2016). https://doi.org/10.1007/s10044-014-0432-4
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DOI: https://doi.org/10.1007/s10044-014-0432-4