old_contents: #!/usr/bin/env python
  # vim: set fileencoding=utf-8 :
  # Andre Anjos <andre.anjos@idiap.ch>
  # Wed 17 Jun 2015 18:14:13 CEST
  
  def CER(prediction, true_labels):
    """
    Calculates the classification error rate for an N-class classification problem
  
  
    Parameters:
  
    prediction (numpy.ndarray): A 1D :py:class:`numpy.ndarray` containing your
      prediction
  
    true_labels (numpy.ndarray): A 1D :py:class:`numpy.ndarray`
      containing the ground truth labels for the input array, organized in the
      same order.
  
    """
  
    errors = (prediction != true_labels).sum()
    return errors/len(prediction)
  
new_contents: #!/usr/bin/env python
  # vim: set fileencoding=utf-8 :
  # Andre Anjos <andre.anjos@idiap.ch>
  # Wed 17 Jun 2015 18:14:13 CEST
  
  def CER(prediction, true_labels):
    """
    Calculates the classification error rate for an N-class classification problem
  
  
    Parameters:
  
    prediction (numpy.ndarray): A 1D :py:class:`numpy.ndarray` containing your
      prediction
  
    true_labels (numpy.ndarray): A 1D :py:class:`numpy.ndarray`
      containing the ground truth labels for the input array, organized in the
      same order.
  
    """
  
    errors = (prediction != true_labels).sum()
    return float(errors)/len(prediction)
  
subject: Revert "Re-added nasty bug"