nl_tokens: Tell the classifier that the given classes will be used for the following samples so that it will know to add negative samples to classes that do not appear .
pl_tokens: function ( classes ) { classes = hash . normalized ( classes ) ; for ( var aClass in <mask> ) { if ( ! ( aClass in this . weights ) ) { this . weights [ aClass ] = { } ; this . weights_sum [ aClass ] = { } ; } } }