code: def _fix_bias(op_name, attrs, num_inputs):
      
      if num_inputs == 3:
          attrs['no_bias'] = False
      elif num_inputs == 2:
          attrs['no_bias'] = True
      else:
          raise ValueError("Unexpected number of inputs for: {}".format(op_name))
      return attrs
docs: A workaround for 'use_bias' attribute since onnx don't provide this attribute,
      we have to check the number of inputs to decide it.