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From Apache Wiki <wikidi...@apache.org>
Subject [Lucene-hadoop Wiki] Trivial Update of "NewsPersonalizationSystem" by udanax
Date Sun, 13 Jan 2008 08:11:16 GMT
Dear Wiki user,

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The following page has been changed by udanax:
http://wiki.apache.org/lucene-hadoop/NewsPersonalizationSystem

------------------------------------------------------------------------------
  
   * Input: User and his clicked stories
    * ~+S+~,,u,, = {s^u^,,1,, , s^u^,,2,, , ... , s^u^,,m}
-  * User similarity = | S,,u1,, I S,,u2 | / |S,,u1, Y S,,u2,, |
+  * User similarity = | S,,u1,, I S,,u2,, | / |S,,u1,, Y S,,u2,, |
   * Output: User clusters. 
   * Similar users belong to same cluster
  === MinHash ===
@@ -62, +62 @@

   * Randomly permute the universe of clicked stories
    * {s^u^,,1,, , s^u^,,2,, , ... , s^u^,,m} = {s^'^,,1,, , s^'^,,2,, , ... , s^'^,,m,,}
   * MH(u) = min(s^u^,,j,,) min defined by permutation
-   * P{MH(u,,1,,) = MH(u,,2,,)} = | S,,u1,, I S,,u2 | / |S,,u1, Y S,,u2,, |
+   * P{MH(u,,1,,) = MH(u,,2,,)} = | S,,u1,, I S,,u2,, | / |S,,u1,, Y S,,u2,, |
   * Pseudo-random permutation
    * Compute hash for each story and treat hash-value as permutation index 
   * Treat !MinHash value as !ClusterId

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