code: def test_attention(self):
      q = k = v = torch.ones((1, 3))
      mod = Attention(scale=1, att_dropout=0.0)
      scores, context = mod(q, k, v)
      self.assertTrue(scores == 1)
      self.assertTrue((context == torch.tensor([1, 1, 1])).all())
  
imports: import unittest
  import torch
  from towhee.models.layers.attention import MultiHeadAttention, Attention
label_desc: Use image node_id 2 for calling the AttentionTest obj's underlying member method code with example usage: obj.test_attention() without return types