class_docstr: Class which performs validation of the submission.
class_docstr_tok: ["Class","which","performs","validation","of","the","submission","."]
docstr: Prepares sample data for the submission.
  
  Args:
    submission_type: type of the submission.
docstr_tok: ["Prepares","sample","data","for","the","submission",".","Args",":","submission_type",":","type","of","the","submission","."]
code: def _prepare_sample_data(self, submission_type):
      """Prepares sample data for the submission.
  
      Args:
        submission_type: type of the submission.
      """
      # write images
      images = np.random.randint(
          0, 256, size=[BATCH_SIZE, 299, 299, 3], dtype=np.uint8
      )
      for i in range(BATCH_SIZE):
          Image.fromarray(images[i, :, :, :]).save(
              os.path.join(
                  self._sample_input_dir, IMAGE_NAME_PATTERN.format(i)
              )
          )
      # write target class for targeted attacks
      if submission_type == "targeted_attack":
          target_classes = np.random.randint(1, 1001, size=[BATCH_SIZE])
          target_class_filename = os.path.join(
              self._sample_input_dir, "target_class.csv"
          )
          with open(target_class_filename, "w") as f:
              for i in range(BATCH_SIZE):
                  f.write(
                      (IMAGE_NAME_PATTERN + ",{1}\n").format(
                          i, target_classes[i]
                      )
                  )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from builtins import int
  import csv
  import json
  import logging
  import os
  import re
  import subprocess
  import sys
  import numpy
  from PIL import Image
  from six import iteritems
label_desc: Use image node_id 7 for calling the SubmissionValidator obj's underlying member method code with example usage: obj._prepare_sample_data(submission_type) without return types