code: def test_step(self, batch, batch_idx, dataloader_idx=0):
      raise NotImplementedError(
          "test with lit_mmdet is not implemented yet."
      )
  
imports: import logging
  from typing import Callable, Optional, Union
  import lightning.pytorch
  import torchmetrics
  from lightning.pytorch.utilities import grad_norm
  from torch.nn.modules.loss import _Loss
  from torchmetrics.aggregation import BaseAggregator
  from ..constants import BBOX, IMAGE, LABEL
  from .utils import apply_layerwise_lr_decay, apply_single_lr, apply_two_stages_lr, get_lr_scheduler, get_optimizer, remove_parameters_without_grad
label_desc: Use image node_id 11 for calling the MMDetLitModule obj's underlying member method code with example usage: obj.test_step(batch, batch_idx, dataloader_idx) without return types