code: def _to_tensor(self):
      x = self.model_inputs[0].zvalue
      y = self.model_inputs[1].zvalue
      truemap = zlayers.KerasLayerWrapper(
          blayer.Threshold(th=0.0, v=0.0)
      )(x - y)
      falsemap = zlayers.KerasLayerWrapper(
          blayer.Threshold(th=-1e-6, v=1.0)
      )(-truemap)
      return falsemap
  
imports: from zoo.pipeline.api.onnx.mapper.operator_mapper import OperatorMapper
  import zoo.pipeline.api.keras.layers
  import bigdl.nn.layer
label_desc: Use image node_id 2 for calling the GreaterMapper obj's underlying member method code with example usage: obj._to_tensor() and returns: falsemap