code: def _construct_stem(
      self,
      temporal_kernel,
      spatial_kernel,
      input_planes,
      stem_planes,
      maxpool,
  ):
      self.stem = ResNeXt3DStemMultiPathway(
          [input_planes],
          [stem_planes],
          [[temporal_kernel, spatial_kernel, spatial_kernel]],
          [[1, 2, 2]],  # stride
          [
              [
                  temporal_kernel // 2,
                  spatial_kernel // 2,
                  spatial_kernel // 2,
              ]
          ],  # padding
          maxpool=[maxpool],
      )
  
imports: from typing import Sequence
  import torch.nn
  from .r2plus1_util import r2plus1_unit
label_desc: Use image node_id 2 for calling the ResNeXt3DStem obj's underlying member method code with example usage: obj._construct_stem(temporal_kernel, spatial_kernel, input_planes, stem_planes, maxpool) without return types