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• W2892787861 abstract "We consider a general regularised interpolation problem for learning a parameter vector from data. The well known representer theorem says that under certain conditions on the regulariser there exists a solution in the linear span of the data points. This is at the core of kernel methods in machine learning as it makes the problem computationally tractable. Most literature deals only with sufficient conditions for representer theorems in Hilbert spaces. We prove necessary and sufficient conditions for the existence of representer theorems in reflexive Banach spaces and illustrate why in a sense reflexivity is the minimal requirement on the function space. We further show that if the learning relies on the linear representer theorem, then the solution is independent of the regulariser and in fact determined by the function space alone. This in particular shows the value of generalising Hilbert space learning theory to Banach spaces." @default.
• W2892787861 created "2018-10-05" @default.
• W2892787861 creator A5042388278 @default.
• W2892787861 date "2018-09-26" @default.
• W2892787861 modified "2023-09-27" @default.
• W2892787861 title "When is there a Representer Theorem? Reflexive Banach spaces" @default.
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• W2892787861 hasPublicationYear "2018" @default.
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