Deepmd-kit

New features:
- Support input script in yaml format 271
- Enable setting test size individually for each system 267

Improvements:
- Support building with TF2.3
- Improved documentation. Automatically generated doc page. Explained keys in the training input script. 297
- Compile with latest stable release of lammps (stable_29Oct2020). Old releases are not supported anymore. 302
- Multi-device and multi-implementation support for OPs. 254

Bug fixings:
- Allow ntypes_model > ntypes_data (fix 261) 296
- Bug in setting `coeff_ener` when `coeff_atom_ener` is given 290

Bug fixings
- Fix several compiling issues of v1.2.3

New feature:
- added tool to convert a v1.2 compatible model to v1.3 compatible model.

Bug fixing:
- neighbor list bug in the GPU implementation.

New features:
- fast gelu implementation
- relax the restriction on the maximal number of neighbors to 4096
- one-sided embedding net

Bug fixings:
- check if the cell volume is positive.
- bugs of dplr
- loading coord when data has only one frame
- ase calculator None-PBC system
- details printing when testing on multiple systems.
- bugs in transform

New features of dp train:
- Polarizability and dipole fitting
- If provided with `stop_lr`, the `decay_rate` will be computed automatically
- Support non-pbc system: add an empty file named nopbc to the data system.
- Use envs `TF_INTRA_OP_PARALLELISM_THREADS` and `TF_INTER_OP_PARALLELISM_THREADS` to control the multi-threading of tf, clean up command line options.
- When the key `systems` is provided with a string, all possible systems will be recursively searched within the dir given by `systems`
- User specific atomic energy.
- Exclude types when building descriptors.
- User specific activation function and network precision.
- Transform neural network parameters.

New features of dp test:
- Recursively search all possible systems in a directory.
- Weighted average of test results

Bug fixings:
- Cuda version compatibility
- raw_to_set when nframe == 1
- Slow test when testing multiple systems
- Potentially wrong neighbor list when number of neighbors is larger than 256.
- Fix bug 163 : broken lib link of dp_ipi
- Infering number of types from data

Bug fixing:
- GPU implementation: stop the program when the number of neighbors is larger than the limit.