message: Make error message more verbose
diff: @@ -188,7 +188,7 @@ void OpSchema::Verify(const NodeProto& node) const {
  } else if (allows_unchecked_attributes_ || isInternalSymbol(name)) {
  continue;
  } else {
  - fail_check("Unrecognized attribute: ", name);
  + fail_check("Unrecognized attribute: ", name, " for operator ", node.op_type());
  }
  switch (expected_type) {
  