code: def test_relative_self_attention(self):
      model = RelativeSelfAttention(in_channels=20, num_heads=4)
      x = torch.randn(1, 49, 20)
      out = model(x)
      self.assertEqual(out.shape, (1, 49, 20))
  
imports: import unittest
  import torch
  from towhee.models.layers.relative_self_attention import RelativeSelfAttention
label_desc: Use image node_id 1 for calling the RelativeSelfAttentionTest obj's underlying member method code with example usage: obj.test_relative_self_attention() without return types