class_docstr: A single set of features of data.
code: def __init__(self, input_ids, input_mask, segment_ids, label_id):
      self.input_ids = input_ids
      self.input_mask = input_mask
      self.segment_ids = segment_ids
      self.label_id = label_id
  
imports: import os
  import csv
  import collections
  import tensorflow
  import texar.tf
label_desc: Use image node_id 1 to create a new InputFeatures object  with example: obj = InputFeatures(input_ids, input_mask, segment_ids, label_id)