Slides in PDF - of Marcus Hutter
Slides in PDF - of Marcus Hutter
Slides in PDF - of Marcus Hutter
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<strong>Marcus</strong> <strong>Hutter</strong> - 63 - Universal Induction & Intelligence<br />
More Stuff / Critique / Problems<br />
• Prior knowledge y can be <strong>in</strong>corporated by us<strong>in</strong>g “subjective” prior<br />
w U ν|y = 2−K(ν|y) or by prefix<strong>in</strong>g observation x by y.<br />
• Additive/multiplicative constant fudges and U-dependence is <strong>of</strong>ten<br />
(but not always) harmless.<br />
• Incomputability: K and M can serve as “gold standards” which<br />
practitioners should aim at, but have to be (crudely) approximated<br />
<strong>in</strong> practice (MDL [Ris89], MML [Wal05], LZW [LZ76], CTW [WSTT95],<br />
NCD [CV05]).<br />
• The M<strong>in</strong>imum Description Length Pr<strong>in</strong>ciple:<br />
M(x) ≈ 2 −K U (x) ≈ 2 −K T (x) . Predict y <strong>of</strong> highest M(y|x) is<br />
approximately same as MDL: Predict y <strong>of</strong> smallest K T (xy).
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