code: def preprocess(self, image_path):
      x = super(TestKeras, self).preprocess(image_path)
      self.data = np.expand_dims(x, 0)
  
file_path: MMdnn/mmdnn/conversion/examples/keras/imagenet_test.py
imports: import argparse
  import numpy
  import sys
  import os
  from mmdnn.conversion.examples.imagenet_test import TestKit
  import colorsys
  from keras import backend
  from PIL import Image, ImageFont, ImageDraw
  from mmdnn.conversion.examples.keras.utils import yolo_eval
label_desc: Use image node_id 2 for calling the TestKeras obj's underlying member method code with example usage: obj.preprocess(image_path) without return types