class_docstr: GramVaaniCSV representing a GramVaani dataset.
  Args:
    csv_filename (str): Path to the GramVaani csv
  Attributes:
      data (:class:`pandas.DataFrame`): `pandas.DataFrame` Containing the GramVaani csv data
code: def __init__(self, csv_filename):
      self.data = self._parse_csv(csv_filename)
  
imports: import csv
  import logging
  import math
  import os
  import subprocess
  import urllib
  from pathlib import Path
  import pandas
  from sox import Transformer
  import swifter
  from deepspeech_training.util.importers import get_importers_parser, get_validate_label
label_desc: Use image node_id 1 to create a new GramVaaniCSV object  with example: obj = GramVaaniCSV(csv_filename)