class_docstr: Test Transformer Encoder
code: def test_sine(self):
      pos_embed = build_position_encoding(
          hidden_dim=2 * 2, max_len=4, position_embedding="sine"
      )
      out = pos_embed(self.x)
      self.assertTrue(out.shape == (1, 1, 2))
  
imports: import unittest
  import torch
  from towhee.models.layers.position_encoding import build_position_encoding
label_desc: Use image node_id 1 for calling the TestPositionEncoding obj's underlying member method code with example usage: obj.test_sine() without return types