code: def __len__(self):
      return len(self.dataset)
  
file_path: fairseq/fairseq/data/numel_dataset.py
imports: import numpy
  import torch
  from .None import BaseWrapperDataset
label_desc: Use image node_id 3 for calling the NumelDataset obj's underlying member method code with example usage: obj.__len__() and returns: len