KNN_MULTI - k-Nearest Neighboors classifier for multi-label 
  collections
    LABELS_AS=KNN_MULTI(A, Q, K, LABELS, NORMALIZED_DOCS, 
    THRESHOLDS) classifies the columns of Q with the K-Nearest 
    Neighboors classifier using the pre-classified columns of 
    matrix A with labels LABELS (cell array of vectors of 
    integers). THRESHOLDS is a vector of class threshold 
    values. NORMALIZED_DOCS defines if cosine (1) or euclidean 
    distance (0) similarity measure is to be used. LABELS_AS 
    contains the assigned labels for the columns of Q. 
 
  Copyright 2011 Dimitrios Zeimpekis, Eugenia Maria Kontopoulou, 
                 Efstratios Gallopoulos