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Let's finish 8-puzzles and TSP (AIMA 3.22)

Some unfinished business from last week: Prasan's working on a definitive test of solvability; Glenn's possibly modifying his heap implementation to do rekeying. And then there's TSP.

See last week's meetup for a description of 3.22.

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  • Ryan H.

    Sometimes Manhattan distance is an inadmissable heuristic after all:

    October 10, 2012

  • Ryan H.

    Bahahahahaha. So that whole time we were discussing RBFS, **I was coding it** while I thought I was discovering A*! I was just too naive to understand my own logic, and didn't realize that in the case of a failure my recursion was unwinding back up the stack. It was both non-optimal and incomplete because due to a mistake I had an open set without all appropriate ancestors, and wasn't propagating my previous costs through the recursion. Only after spending all day wrangling it to fit the A* psuedo-code and studying this morning did I realize I was running an implementation all along.

    I prefer to think of my failures as accidental genius. ;-)

    October 12, 2012

    • Peter D.

      That is kind of hilarious, actually; I'm in Palo Alto today, so I scheduled for next week. Can't wait to see the code.

      October 15, 2012

  • Glenn B.

    I found AIMA 3rd edition soft cover for $48 at

    October 9, 2012

  • Peter D.

    Great: we discussed the ins and outs of RBFS and broke off into smaller groups where Michael got a chance to talk about his work and Glenn got a chance to show his skip-list implementation and preview a little talk on object-oriented C.

    October 9, 2012

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