class_docstr: Test ImageLoader
class_docstr_tok: ["Test","ImageLoader"]
code: def test_png_multi_zip_load(self):
      loader = dc.data.ImageLoader()
      dataset = loader.create_dataset(self.multi_zip_path)
      assert dataset.X.shape == (2, 768, 1024, 3)
  
imports: import os
  import unittest
  import tempfile
  from scipy import misc
  import deepchem
  import zipfile
  import numpy
label_desc: Use image node_id 10 for calling the TestImageLoader obj's underlying member method code with example usage: obj.test_png_multi_zip_load() without return types