class_docstr: Problem spec for Commonvoice using clean and noisy data.
class_docstr_tok: ["Problem","spec","for","Commonvoice","using","clean","and","noisy","data","."]
code: def num_dev_shards(self):
      return 1
  
imports: import csv
  import os
  import tarfile
  from tensorflow.compat.v1 import estimator
  import tqdm
  from tensor2tensor.data_generators import generator_utils
  from tensor2tensor.data_generators import problem
  from tensor2tensor.data_generators import speech_recognition
  from tensor2tensor.utils import registry
label_desc: Use image node_id 3 for calling the CommonVoice obj's underlying member method code with example usage: obj.num_dev_shards() and returns: int