code: def __call__(self, batch):
      if dataset_keys.VALID_MASK_IMG in batch:
          batch[dataset_keys.VALID_MASK_IMG] = (
              self.layer((~batch[dataset_keys.VALID_MASK_IMG]).float())
              == 0
          )
      return batch
  
imports: import torch
  import dataset_keys
label_desc: Use image node_id 2 for calling the DilateValidMask obj's underlying member method code with example usage: obj.__call__(batch) and returns: batch