code: def BuildStats(self):
      
      artifact_reader = reader.YamlArtifactsReader()
      self.label_counts = {}
      self.os_counts = {}
      self.path_count = 0
      self.reg_key_count = 0
      self.source_type_counts = {}
      self.total_count = 0
  
      for artifact_definition in artifact_reader.ReadDirectory('data'):
        if hasattr(artifact_definition, 'labels'):
          for label in artifact_definition.labels:
            self.label_counts[label] = self.label_counts.get(label, 0) + 1
  
        for source in artifact_definition.sources:
          self.total_count += 1
          source_type = source.type_indicator
          self.source_type_counts[source_type] = self.source_type_counts.get(
              source_type, 0) + 1
  
          if source_type == definitions.TYPE_INDICATOR_WINDOWS_REGISTRY_KEY:
            self.reg_key_count += len(source.keys)
          elif source_type == definitions.TYPE_INDICATOR_WINDOWS_REGISTRY_VALUE:
            self.reg_key_count += len(source.key_value_pairs)
          elif source_type in (definitions.TYPE_INDICATOR_FILE,
                               definitions.TYPE_INDICATOR_DIRECTORY):
            self.path_count += len(source.paths)
  
          os_list = source.supported_os
          for os_str in os_list:
            self.os_counts[os_str] = self.os_counts.get(os_str, 0) + 1
docs: Builds the statistics.