// SavedModel SignatureDef keys for the initialization and train ops. Used in
// V2 SavedModels.
inline constexpr char kSavedModelInitOpSignatureKey[] = "__saved_model_init_op";
inline constexpr char kSavedModelTrainOpSignatureKey[] =
    "__saved_model_train_op";

// Key in the TensorBundle for the object graph proto.
inline constexpr char kObjectGraphProtoKey[] = "_CHECKPOINTABLE_OBJECT_GRAPH";