Author: Jeremiah Penery
Date: 10:53:17 09/11/02
Go up one level in this thread
On September 11, 2002 at 13:20:55, Vincent Diepeveen wrote: >On September 11, 2002 at 12:31:44, Robert Hyatt wrote: > >>On September 10, 2002 at 20:45:43, Vincent Diepeveen wrote: >> >>>On September 10, 2002 at 18:06:01, Gian-Carlo Pascutto wrote: >>> >>>>You want to store two actual values, not flags that indicate what >>>>kind of bound it is. >>> >>>did i implement it smarter then or what? >>>i used 2 bits in total. 'upperbound, lowerbound, truebound'. >>>the search result is based upon a single bound. So it IS the same, >>>it IS higher or it IS lower. >>> >>>What am i missing here? >>> >> >> >>A _lot_. >> >>This is a known issue with mtd(f) and fail-soft. If you bounce over the >>true score, to the "other side" then suddenly where you were storing >>upper bounds you are now storing lower bounds, and vice-versa. Now if >>you bounce back over the true score again, you have no useful upper bounds >>where you need them, you only have lower bounds. And you have no useful lower >>bounds where you need them you have only upper bounds. > >I do not see *anyhow* how you can jump over the score. Because it's stupid to _always_ increase the window by .001 (or .01). It will make you do far too many researches.
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