code: def default_onnx_opset(self) -> int:
      # needs to be >= 14 to support tril operator
      return max(super().default_onnx_opset, 14)
  
file_path: transformers/src/transformers/models/longformer/configuration_longformer.py
imports: from collections import OrderedDict
  from typing import TYPE_CHECKING, Any, List, Mapping, Optional, Union
  from ...configuration_utils import PretrainedConfig
  from ...onnx import OnnxConfig
  from ...utils import TensorType, logging
label_desc: Use image node_id 5 for calling the LongformerOnnxConfig obj's underlying member method code with example usage: obj.default_onnx_opset() and returns: max