DeepXDE v0.8.6

Areas of improvement

• Model.save() supports pickle
• PDE
  • supports pde as None
  • supports bcs as the empty list []
  • accepts train_distribution = 'uniform' or 'pseudo' or 'sobol'
• OpNN supports user-defined branch net
• OpDataSet supports mini-batch training

API changes

• Rename Model._print_model() to Model.print_model()

New APIs

• Add Model.state_dict()
• Add PDE.resample_train_points()