Date: 09 Jun 2005

Unsupervised coding with lococode

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Traditional approaches to sensory coding use code component-oriented objective functions (COCOFs) to evaluate code quality. Previous COCOFs do not take into account the information-theoretic complexity of the code-generating mapping itself. We do: “Low-complexity coding and decoding” (LOCOCODE) generates so-called lococodes that (1) convey information about the input data, (2) can be computed from the data by a low-complexity mapping (LCM), and (3) can be decoded by a LCM. We implement LococoDE by training autoassociators with Flat Minimum Search (FMS), a general method for finding lowcomplexity neural nets. LococoDE extracts optimal codes for difficult versions of the “bars” benchmark problem. As a preprocessor for a vowel recognition benchmark problem it sets the stage for excellent classification performance.