code: def num_nodes_per_level(self):
      return [
          self.num_leaves // agg_multiple
          for agg_multiple in self.agg_multiples
      ]
  
imports: from typing import Iterator, List
  import numpy
  import pandas
  from gluonts.core.component import validated
  from gluonts.model.forecast import SampleForecast
  from gluonts.mx import Tensor
label_desc: Use image node_id 5 for calling the TemporalHierarchy obj's underlying member method code with example usage: obj.num_nodes_per_level() and returns: unknown