class_docstr: 3D convolutions for R3D (3x3x3 kernel)
code: def get_downsample_stride(stride):
      return stride, stride, stride
  
imports: import torch.nn
  from torch.hub import load_state_dict_from_url
label_desc: Use image node_id 2 for calling the Conv3DSimple obj's underlying member method code with example usage: obj.get_downsample_stride(stride) and returns: stride,  stride,  stride