/*
* SPDX-License-Identifier: MIT
* Copyright (c) 2023 - 2026. The DeepCausality Authors and Contributors. All Rights Reserved.
*/usedeep_causality_tensor::CausalTensorTrain;/// The physical gradient triple `(∂/∂x, ∂/∂y, ∂/∂z)` a 3-D metric returns.
pubtypePhysicalGradient3d<R>=(CausalTensorTrain<R>,CausalTensorTrain<R>,CausalTensorTrain<R>,);