code: def __len__(self):
      return len(self.dataloader)
  
file_path: DALI/docs/examples/use_cases/pytorch/efficientnet/image_classification/mixup.py
imports: import torch
  import torch.nn
  import numpy
label_desc: Use image node_id 4 for calling the MixUpWrapper obj's underlying member method code with example usage: obj.__len__() and returns: len