<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 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