code: def num_samples(self):
      return len(self.seq)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import random
  import logging
  import sys
  import numbers
  import math
  import sklearn
  import datetime
  import numpy
  import cv2
  from config import config
  import mxnet
  from mxnet import ndarray
  from mxnet import io
  from mxnet import recordio
label_desc: Use image node_id 3 for calling the FaceImageIter obj's underlying member method code with example usage: obj.num_samples() and returns: len