docstr: Test that the hooks are constructed correctly.
docstr_tok: ["Test","that","the","hooks","are","constructed","correctly","."]
code: def test_constructors(self) -> None:
      """
      Test that the hooks are constructed correctly.
      """
      self.constructor_test_helper(
          config={"num_samples": 10},
          hook_type=PreciseBatchNormHook,
          hook_registry_name="precise_bn",
          invalid_configs=[{}, {"num_samples": 0}],
      )
  
file_path: ClassyVision/test/hooks_precise_batch_norm_hook_test.py
imports: import copy
  import torch
  import torch.nn
  from classy_vision.hooks import ClassyHook
  from classy_vision.hooks.precise_batch_norm_hook import PreciseBatchNormHook
  from classy_vision.tasks import build_task
  from classy_vision.trainer import ClassyTrainer
  from test.generic.config_utils import get_test_mlp_task_config
  from test.generic.hook_test_utils import HookTestBase
label_desc: Use image node_id 3 for calling the TestPreciseBatchNormHook obj's underlying member method code with example usage: obj.test_constructors() without return types