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Is the space complexity of planted clique recovery the same as that of detection?

Talkat ITCS 2021 · 2021-01-06..01-08
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slides:none on file

Asks whether planted clique recovery can match detection in space and gives a near-complete constructive answer: a derandomized, combinatorial algorithm is built that recovers cliques for K ≥ ω(√n · log^{(L)} n) using O(log n) bits, and for K = Θ(√n) it uses about log n · log n* bits. Reduction from detection fails due to insufficiently small error, spectral and SDP approaches are shown infeasible in log space, and the new algorithm succeeds up to the tiny iterated-log gap.

AI-written summary · about

  1. 0:00Intro
  2. 0:27What is a 'tractable inference problem?
  3. 1:57A case study the planted clique problem
  4. 3:28A Brief History
  5. 4:58What do we talk about when we talk about computational efficiency?
  6. 8:07What is the first thing to study, if we study alternate notions of efficiency?
  7. 9:26Planted Clique + Space Complexity
  8. 12:40Some easy to see' facts
  9. 16:02Can previous polynomial time algorithms help?
  10. 22:15Main result
  11. 24:11Open Problems
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