code: def test_concat():
      concat = Concat()
      m1 = torch.randn(4, 3, 5)
      m2 = torch.randn(4, 2, 5)
      output = concat([m1, m2])
      assert output.shape == (4, 5 * (3 + 2))
  
imports: import torch
  from kale.embed.feature_fusion import BimodalInteractionFusion, Concat, LowRankTensorFusion
label_desc: Use image node_id 1 for calling a global function with example usage: test_concat() without return types