code: def _check(self, cst):  # type: ignore
      if isinstance(cst, tuple):
          raise TypeError(
              f"Unexpected type {type(cst)} for a constant."
          )
      return cst
  
imports: import numpy
  from onnx.reference.custom_element_types import bfloat16, float8e4m3fn, float8e4m3fnuz, float8e5m2, float8e5m2fnuz, int4, uint4
  from onnx.reference.op_run import OpRun, RefAttrName
label_desc: Use image node_id 1 for calling the ConstantCommon obj's underlying member method code with example usage: obj._check(cst) and returns: cst