docstr: The length of the noising dataset is the length of src.
docstr_tok: ["The","length","of","the","noising","dataset","is","the","length","of","src","."]
code: def __len__(self):
      """
      The length of the noising dataset is the length of src.
      """
      return len(self.src_dataset)
  
imports: import numpy
  import torch
  from fairseq.data import data_utils
label_desc: Use image node_id 3 for calling the NoisingDataset obj's underlying member method code with example usage: obj.__len__() and returns: len