TF_OpDefinitionBuilderAddAttr(builder, "foo2: string=\"my string\"");
  TF_OpDefinitionBuilderSetIsCommutative(builder, true);
  TF_OpDefinitionBuilderSetIsAggregate(builder, true);
  TF_OpDefinitionBuilderSetAllowsUninitializedInput(builder, true);
  std::string deprecation_msg = "use something else instead";
  TF_OpDefinitionBuilderDeprecated(builder, 4, deprecation_msg.c_str());

  TF_Status* status = TF_NewStatus();

// initialize tensors for the first time should set this field to true, to allow
// the Op to take an uninitialized Tensor as input.
TF_CAPI_EXPORT extern void TF_OpDefinitionBuilderSetAllowsUninitializedInput(
    TF_OpDefinitionBuilder* builder, bool allows_uninitialized_input);

// Adds a deprecation warning for the given op. This indicates to the user that