code: def __init__(self, onnx_filepath, session_options=None):
      self.onnx_filepath = onnx_filepath  # onnx filepath
      self.onnx_model = None  # onnx model
      self.ortsess = None  # onnxruntime session
      self.session_options = session_options
      self._build_ortsess(session_options)
  
file_path: BigDL/python/nano/src/bigdl/nano/deps/onnxruntime/core/onnxruntime_model.py
imports: from pathlib import Path
  import onnxruntime
  import onnx
  from bigdl.nano.utils.common import invalidInputError, _flatten
  import numpy
label_desc: Use image node_id 1 to create a new ONNXRuntimeModel object  with example: obj = ONNXRuntimeModel(onnx_filepath, session_options)