docs: def add_validation_patch(self, patch):
          """
          Extracts ground truth and classification results from the EOPatch and
          aggregates the results.
          """
          # 2. Convert 8-bit mask
          self._transform_truth(patch)
  
          # 3. Count truth labeled pixels
          self._count_truth_pixels()
  
          # 5. Perform classification
          self._classify(patch)
  
          # 6. Count pixel classified as class i
          self._count_classified_pixels()
  
          self.n_validation_sets = self.n_validation_sets + 1