### Lunches

#### June 9: MISC lunch -- SND continued

Bahman continued his presentation of the Survivable Network Design approximation algorithm. We got stuck on some issues about vertex solutions to the LP... :-\ |

#### June 8: A&T Seminar presentation

A straggler talk in the Algorithms & Theory seminar: Janno talked about proximal and augmented Lagrangian algorithms for machine learning problems with loss and regularization terms in the objective function. |

#### June 7: APX Lunch on Survivable Network Design

Bahman started presenting, in all the dirty details, the iterated LP-rounding approximation algorithm for survivable network design. |

#### June 6: Foundations of Machine Learning

After the exam stress has subsided, we started our usual schedule again: Over the summer, Tuesdays will be dedicated to the theory behind Machine Learning. |

#### Fri May 12: Discrepancy upper bound

We worked through the proof that every hypergraph with sufficiently many edges has a 2-coloring with discrepancy at most sqrt( n log(m/n) ). Highlights of the proof included the use of entropy and Kleitman's theorem. |

#### Thu May 11: Sensitivity analysis of optimization problems

Abdullah explained how the Lagrange multipliers form the sub-gradient or gradient, respectively, of a parameterized continuous optimization problem. |

#### Wed May 10: Nash equilibria and sampling

Bahman continued his discussion of neural networks: a generator-discriminator pair sample from a given distribution. |

#### Mon May 8: Joint TCS Pizza Seminar

Dominique presented a problem related to quantum query complexity of random function inversions. |

#### Fri May 5: Problems related to edge coverings

Visiting PhD student Mahdi gave a survey over his research in edge coverings, vertex coverings: complexity, algorithms, combinatorics. He also discussed some of the problems he hopes to attach while in Tartu. |

#### Thu May 4: Lagrange duality

Abdullah explained Lagrange duality for optimization problems: The Lagrange dual function, the Lagrange dual, weak duality theorem, strong duality, ... |

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