code: def test_16_groups(self):
      sizes = [
          [8, 2560, 16, 16],
          [8, 1920, 32, 32],
          [8, 1920, 16, 16],
          [8, 2560, 8, 8],
      ]
      for sz in sizes:
          n, c, h, w = sz
          self.verify_group_norm(
              GroupNorm, N=n, C=c, H=h, W=w, G=16, act="swish"
          )
  
imports: import torch
  import unittest
label_desc: Use image node_id 16 for calling the GroupNormTest obj's underlying member method code with example usage: obj.test_16_groups() without return types