code: def test_split_src_to_prevent_padding_target_prefix_is_ok_when_different_size(  # noqa: E501
      self,
  ):
      default_length = 5
      src = torch.randint(0, 10, (6, default_length, 1))
      src_len = default_length * torch.ones(6, dtype=torch.int)
      new_length = 4
      src_len[1] = new_length
      (
          src,
          src_len,
          target_prefix,
      ) = GeneratorLM.split_src_to_prevent_padding(src, src_len)
      self.assertTupleEqual(src.shape, (6, new_length, 1))
      self.assertTupleEqual(target_prefix.shape, (6, 1, 1))
      self.assertTrue(
          src_len.equal(new_length * torch.ones(6, dtype=torch.int))
      )
  
imports: import unittest
  from onmt.translate import GeneratorLM
  import torch
label_desc: Use image node_id 2 for calling the TestGeneratorLM obj's underlying member method code with example usage: obj.test_split_src_to_prevent_padding_target_prefix_is_ok_when_different_size() without return types