old_contents: """Functions to assess classifier performance and to spot check specific
  input/output pairs.
  """
  
new_contents: """Functions to assess classifier performance and to spot check specific
  input/output pairs.
  """
  
  from sklearn.metrics import classification_report
  
  
  def report(clf, x_test, y_test, tokens):
      """Given a trained classifier with a predict method, input and output test
      data, and a tokens that are index-aligned with the columns of the output
      test data, return a string report of the classification perforamnce.
      """
      y_pred = clf.predict(x_test)
      return classification_report(y_test, y_pred, target_names=tokens)
  
subject: add classification performance report function