code: def of(node, _params, inputs):
      m = importlib.import_module(
          "zoo.pipeline.api.onnx.mapper." + node.op_type.lower()
      )
      cls = getattr(m, node.op_type + "Mapper")
      return cls(node, _params, inputs)
  
file_path: analytics-zoo/pyzoo/zoo/pipeline/api/onnx/mapper/operator_mapper.py
imports: import zoo.pipeline.api.keras.layers
  import zoo.pipeline.api.autograd
  from zoo.pipeline.api.onnx.onnx_helper import OnnxHelper
  import zoo.pipeline.api.onnx.mapper
  import importlib
  import numpy
label_desc: Use image node_id 2 for calling the OperatorMapper obj's underlying member method code with example usage: obj.of(node, _params, inputs) and returns: cls