code: def _to_tensor(self):
      x = self.model_inputs[0].zvalue
      return autograd.abs(x)
  
file_path: analytics-zoo/pyzoo/zoo/pipeline/api/onnx/mapper/abs.py
imports: from zoo.pipeline.api.onnx.mapper.operator_mapper import OperatorMapper
  from zoo.pipeline.api.onnx.onnx_helper import OnnxHelper
  import zoo.pipeline.api.autograd
  import zoo.pipeline.api.keras.layers
label_desc: Use image node_id 2 for calling the AbsMapper obj's underlying member method code with example usage: obj._to_tensor() and returns: autograd