code: def define_graph(self):
      self.data = self.inputs()
      self.crop_pos = self.input_crop_pos()
      self.crop_size = self.input_crop_size()
      data = self.cast_in(self.data)
      data = data.gpu() if self.device == "gpu" else data
      out = self.slice(data, self.crop_pos, self.crop_size)
      if self.extra_outputs:
          return out, self.data, self.crop_pos, self.crop_size
      else:
          return out
  
imports: from nvidia.dali import Pipeline, pipeline_def, ops, fn, types
  import numpy
  import os
  from functools import partial
  from math import floor
  from test_utils import compare_pipelines, get_dali_extra_path, RandomDataIterator, generator_random_axes_for_3d_input, generator_random_data, as_array
  from nose_utils import assert_raises
  from nose2.tools import params
label_desc: Use image node_id 2 for calling the SliceSynthDataPipeline obj's underlying member method code with example usage: obj.define_graph() and returns: out,  self,  self,  self, out