code: def __len__(self):
      return self.size
  
file_path: ColossalAI/examples/tutorial/sequence_parallel/data/datasets/blendable_dataset.py
imports: import time
  import numpy
  import torch
label_desc: Use image node_id 2 for calling the BlendableDataset obj's underlying member method code with example usage: obj.__len__() and returns: self