DeepXDE v1.14.0

Areas of improvement

• dde.gradients supports 3D outputs
• Support MAE for all backends
• Backend PyTorch: Add L1 and L1+L2 regularizers
• Backend PyTorch: DeepONet supports regularization
• Backend Pytorch: Add Apple MPS GPU support
• Backend JAX: FNN supports regularization
• Backend JAX: Fix external variable initialization

New APIs

• Support mixed precision

Thanks to all the contributors to this release!

@g-w1 @lululxvi @Jerry-Jzy @KangyuWeng @vl-dud @bonneted @kyouma