PAC learning, VC dimension, and the arithmetic hierarchy
2015
We compute that the index set of PAC-learnable concept classes is m-complete $${\Sigma^{0}_{3}}$$Σ30 within the set of indices for all concept classes of a reasonable form. All concept classes considered are computable enumerations of computable $${\Pi^{0}_{1}}$$?10 classes, in a sense made precise here. This family of concept classes is sufficient to cover all standard examples, and also has the property that PAC learnability is equivalent to finite VC dimension.
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