code: def delete_features(host_name, client_name, client_pass, feature_names=None):
      
      # Get all features.
      if feature_names is None:
          feature_names = get_feature_names(host_name,
                                            client_name,
                                            client_pass)
  
      # Remove all features.
      feature_to_be_removed = ("&".join(["ftr=%s"]*len(feature_names))) % tuple(feature_names)
      features_req = construct_request("pers",
                                       client_name,
                                       client_pass,
                                       'remftr',
                                       feature_to_be_removed)
      send_request(host_name,
                   features_req)
docs: Remove a number of numerical features in the client. If a list  is not provided, remove all features.
  
      Inputs: - host_name: A string containing the address of the machine where the PServer instance is hosted.
              - client_name: The PServer client name.
              - client_pass: The PServer client's password.
              - feature_names: A python list of feature names.