From 470ec6988a00e77d361115c4bff850fcb12e7539 Mon Sep 17 00:00:00 2001
From: Patrick Simianer <p@simianer.de>
Date: Wed, 30 Nov 2011 14:34:22 +0100
Subject: lplp.rb doc

---
 dtrain/hstreaming/lplp.rb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/dtrain/hstreaming/lplp.rb b/dtrain/hstreaming/lplp.rb
index 0ec21a46..40409bbd 100755
--- a/dtrain/hstreaming/lplp.rb
+++ b/dtrain/hstreaming/lplp.rb
@@ -37,7 +37,7 @@ end
 
 def cut(weights, norm_fun, n, epsilon=0.0001)
   weights.each { |k,v|
-    if norm_fun.call(v, n).abs > epsilon
+    if norm_fun.call(v, n).abs >= epsilon
       puts "#{k}\t#{mean(v, n)}"
     end
   }
@@ -87,6 +87,10 @@ _test()
 # actually do something
 def usage()
   puts "lplp.rb <l0,l1,l2,linfty,mean,median> <cut|select_k> <k|threshold> [n] < <input>"
+  puts "   l0...: norms for selection"
+  puts "select_k: only output top k (according to the norm of their column vector) features"
+  puts "     cut: output features with weight >= threshold"
+  puts "       n: if we do not have a shard count use this number for averaging"
   exit
 end
 
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