5. The method of claim 1 , further comprising generating a plurality of classifiers including a plurality of k-dimensional trees wherein selecting the matched files comprises selecting at least ten nearest neighbors based for each one of the plurality of k-dimensional trees.
5. The method of claim 1 , further comprising generating a plurality of classifiers including a plurality of k-dimensional trees wherein selecting the matched files comprises selecting at least ten nearest neighbors based for each one of the plurality of k-dimensional trees. 6. The method of claim 5 , wherein associating the respective annotation with the respective second digital file includes determining for each nearest neighbor a vote based on the weight value corresponding to one or more of the respective classifiers, and associating one or more annotations to the respective second digital file based on the vote for each nearest neighbor or a sum of the votes.