code: def optimizer(self, context: Context):
      return torch.optim.AdamW(
          context.network.parameters(), lr=1e-4, weight_decay=1e-5
      )
  
imports: import logging
  import torch
  from lib.transforms.transforms import ConcatenateROId, GaussianSmoothedCentroidd, GetCentroidsd, SelectVertebraAndCroppingd
  from monai.handlers import TensorBoardImageHandler, from_engine
  from monai.inferers import SimpleInferer
  from monai.losses import DiceCELoss
  from monai.transforms import Activationsd, AsDiscreted, EnsureChannelFirstd, EnsureTyped, GaussianSmoothd, LoadImaged, RandScaleIntensityd, RandShiftIntensityd, Resized, ScaleIntensityd, ScaleIntensityRanged, SelectItemsd
  from monailabel.tasks.train.basic_train import BasicTrainTask, Context
  from monailabel.tasks.train.utils import region_wise_metrics
label_desc: Use image node_id 3 for calling the SegmentationVertebra obj's underlying member method code with example usage: obj.optimizer(context) and returns: torch