code: def test_exists_without_version(self) -> None:
      with tempfile.TemporaryDirectory() as tmpdir:
          av_0 = torch.randn(64, 16)
          self.assertFalse(AV.exists(tmpdir, "dummy", "layer1.0.conv1"))
  
          AV.save(
              tmpdir,
              "dummy",
              DEFAULT_IDENTIFIER,
              "layer1.0.conv1",
              av_0,
              "0",
          )
          self.assertTrue(
              AV.exists(
                  tmpdir,
                  "dummy",
                  DEFAULT_IDENTIFIER,
                  "layer1.0.conv1",
              )
          )
  
imports: import glob
  import tempfile
  from datetime import datetime
  from typing import cast, List
  import torch
  from captum._utils.av import AV
  from tests.helpers.basic import assertTensorAlmostEqual, BaseTest
  from tests.helpers.basic_models import BasicLinearReLULinear
  from torch.utils.data import DataLoader, Dataset
label_desc: Use image node_id 1 for calling the Test obj's underlying member method code with example usage: obj.test_exists_without_version() without return types