code: def __len__(self):
      return math.floor(len(self.sentences) / (2 * self.batch_size))
  
imports: import torch
  from torch import nn, Tensor
  from typing import Iterable, Dict
  from ..SentenceTransformer import SentenceTransformer
  from ..None import util
  import copy
  import random
  import math
  from ..None import InputExample
  import numpy
label_desc: Use image node_id 3 for calling the ContrastiveTensionDataLoader obj's underlying member method code with example usage: obj.__len__() and returns: math