code: def test_not_implemented_steps():
      embedder = ImageEmbedder(backbone="resnet18")
  
      with pytest.raises(NotImplementedError):
          embedder.training_step([], 0)
      with pytest.raises(NotImplementedError):
          embedder.validation_step([], 0)
      with pytest.raises(NotImplementedError):
          embedder.test_step([], 0)
  
file_path: lightning-flash/tests/image/embedding/test_model.py
imports: from typing import Any
  import flash
  import pytest
  import torch
  from flash.core.utilities.imports import _TOPIC_IMAGE_AVAILABLE, _TORCHVISION_AVAILABLE, _VISSL_AVAILABLE
  from flash.image import ImageClassificationData, ImageEmbedder
  from torch import Tensor
  from tests.helpers.task_tester import TaskTester
label_desc: Use image node_id 4 for calling a global function with example usage: test_not_implemented_steps() without return types