code: def test_index_uint8(self, gc, dc):
      # Indexing with uint8 is deprecated, but we need to provide backward compatibility for some old models exported through ONNX
      op = core.CreateOperator(
          "ATen", ["self", "mask"], ["Z"], operator="index"
      )
  
      def ref(self, mask):
          return (self[mask.astype(np.bool_)],)
  
      tensor = np.random.randn(2, 3, 4).astype(np.float32)
      mask = np.array([[1, 0, 0], [1, 1, 0]]).astype(np.uint8)
  
      self.assertReferenceChecks(gc, op, [tensor, mask], ref)
  
file_path: pytorch/caffe2/contrib/aten/aten_test.py
imports: from caffe2.python import core
  from hypothesis import given
  import caffe2.python.hypothesis_test_util
  import hypothesis.strategies
  import numpy
label_desc: Use image node_id 6 for calling the TestATen obj's underlying member method code with example usage: obj.test_index_uint8(gc, dc) and returns: self