code: def _update_frame_interval(self, frame_interval):
      if frame_interval and frame_interval not in self._frame_intervals:
          fs, fe = frame_interval
          self.base_labels["openlabel"]["frame_intervals"].append(
              {"frame_start": fs, "frame_end": fe}
          )
          self._frame_intervals.append(frame_interval)
  
imports: from collections import defaultdict
  import os
  import eta.core.serial
  import fiftyone.core.odm.dataset
label_desc: Use image node_id 3 for calling the OpenLABELLabels obj's underlying member method code with example usage: obj._update_frame_interval(frame_interval) without return types