code: def iter_setup(self):
      self.feed_input(
          self.out, self.data, use_copy_kernel=self.use_copy_kernel
      )
  
imports: from nvidia.dali.backend_impl import TensorGPU, TensorListGPU
  from nvidia.dali.pipeline import Pipeline
  import nvidia.dali.ops
  import nvidia.dali.tensors
  import nvidia.dali.types
  import numpy
  from nose_utils import assert_raises, raises
  import cupy
  from test_utils import py_buffer_from_address
label_desc: Use image node_id 3 for calling the ExternalSourcePipe obj's underlying member method code with example usage: obj.iter_setup() without return types