code: def __len__(self):
      return len(self.data)
  
file_path: NeMo/nemo/collections/nlp/data/text_classification/ptune_text_classification_dataset.py
imports: import json
  import os
  from typing import Dict, List, Optional
  from nemo.core.classes import Dataset
  from nemo.core.neural_types import NeuralType, StringLabel, StringType
label_desc: Use image node_id 3 for calling the PTuneTextClassificationDataset obj's underlying member method code with example usage: obj.__len__() and returns: len