Revert "Fix a bug"

This reverts commit 151e9f8.

Author: sueka

lib/classifier-reborn/lsi.rb

@@ -143,7 +143,7 @@ def build_index(cutoff = 0.75)
         tdm = Matrix.rows(tda).trans
         ntdm = build_reduced_matrix(tdm, cutoff)
 
-        ntdm.column_size.times do |col|
+        ntdm.row_size.times do |col|
           doc_list[col].lsi_vector = ntdm.column(col) if doc_list[col]
           if ntdm.column(col).zero?
             doc_list[col].lsi_norm = ntdm.column(col) if doc_list[col]