code: def _run(self, a, b):  # type: ignore
      return (numpy_matmul(a, b),)
  
imports: import numpy
  from onnx.reference.ops._op import OpRunBinaryNum
label_desc: Use image node_id 1 for calling the MatMul obj's underlying member method code with example usage: obj._run(a, b) and returns: numpy_matmul