ImmediateExecutionContext* ctx,
                       std::unique_ptr<TFSignatureDefFunction>* out);

  // This method creates a "Call" Op used to execute the function.
  Status MakeCallOp(absl::Span<AbstractTensorHandle* const> inputs,
                    ImmediateOpPtr* out) const override;

  const SignatureDefFunctionMetadata& GetFunctionMetadata() const override;

                       " should have been initialized prior to being called."));
    }
    ImmediateOpPtr function_op;
    TF_RETURN_IF_ERROR(create_resource_fn->MakeCallOp({}, &function_op));
    TF_RETURN_IF_ERROR(function_op->SetDeviceName(resource.device.c_str()));

    AbstractTensorHandle* resource_handle = nullptr;
    int num_retvals = 1;