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• W2125911849 abstract "We explicitly analyze the trajectories of learning near singularities in hierarchical networks, such as multilayer perceptrons and radial basis function networks, which include permutation symmetry of hidden nodes, and show their general properties. Such symmetry induces singularities in their parameter space, where the Fisher information matrix degenerates and odd learning behaviors, especially the existence of plateaus in gradient descent learning, arise due to the geometric structure of singularity. We plot dynamic vector fields to demonstrate the universal trajectories of learning near singularities. The singularity induces two types of plateaus, the on-singularity plateau and the near-singularity plateau, depending on the stability of the singularity and the initial parameters of learning. The results presented in this letter are universally applicable to a wide class of hierarchical models. Detailed stability analysis of the dynamics of learning in radial basis function networks and multilayer perceptrons will be presented in separate work." @default.
• W2125911849 created "2016-06-24" @default.
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• W2125911849 date "2008-03-01" @default.
• W2125911849 modified "2023-10-16" @default.
• W2125911849 title "Dynamics of Learning Near Singularities in Layered Networks" @default.
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• W2125911849 doi "https://doi.org/10.1162/neco.2007.12-06-414" @default.
• W2125911849 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18045020" @default.
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