code: def __len__(self):
      return len(self.dataloader)
  
file_path: OpenPrompt/tutorial/7_ernie_paddlepaddle/dataloader.py
imports: from typing import *
  from tqdm import tqdm
  from collections import defaultdict
  import warnings
  import numpy
  from paddlenlp.data import Stack, Tuple, Pad
  import paddle
  from utils import signature
  from data_utils import InputFeatures
label_desc: Use image node_id 4 for calling the ErniePromptDataLoader obj's underlying member method code with example usage: obj.__len__() and returns: len