code: def _get_dilations(dilation_depth, n_stacks):
      return [2**i for i in range(dilation_depth)] * n_stacks
  
imports: import math
  from typing import List, Optional
  import mxnet
  from mxnet import gluon
  from mxnet.gluon import nn
  from gluonts.core.component import validated
  from gluonts.mx import Tensor
  from gluonts.mx.block.feature import FeatureEmbedder
label_desc: Use image node_id 2 for calling the WaveNet obj's underlying member method code with example usage: obj._get_dilations(dilation_depth, n_stacks) and returns: unknown