class_docstr: (2+1)D convolutions for R2plus1D (1x3x3 kernel + 3x1x1 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 Conv2Plus1D obj's underlying member method code with example usage: obj.get_downsample_stride(stride) and returns: stride,  stride,  stride