public POSMikheevFeatureExtractor(String viewName,String json){
  this.viewName=viewName;
  this.counter=POSMikheevCounter.read(json);
}

public POSMikheevFeatureExtractor ( String viewName , String json ) { this . viewName = viewName ; this . counter = POSMikheevCounter . read ( json ) ; }
construct the feature extractor given a trained counter in json format .
