code: def __len__(self):
      return int(np.ceil(len(self.x) / float(self.batch_size)))
  
imports: import torch
  import tensorflow
  import os
  import numpy
  import keras
  from keras import layers
  from keras import ops
label_desc: Use image node_id 2 for calling the ExamplePyDataset obj's underlying member method code with example usage: obj.__len__() and returns: int