code: def __len__(self):
      return len(self.input_ids)
  
file_path: ColossalAI/examples/language/opt/data.py
imports: import torch
  from datasets import load_dataset
  from torch.utils.data import Dataset
label_desc: Use image node_id 2 for calling the NetflixDataset obj's underlying member method code with example usage: obj.__len__() and returns: len