dpdata.md

Dpdata Toolkit

ai2-kit tool dpdata

This toolkit is a command line wrapper of dpdata to allow user to process DeepMD dataset via command line.

Usage

ai2-kit tool dpdata # show all commands
ai2-kit tool dpdata to_ase -h  # show doc of specific command

This toolkit include the following commands:

Command	Description	Example	Reference
read	Read dataset into memory. This command by itself is useless, you should chain other command after reading data into memory.	ai2-kit tool dpdata read ./path/to/dataset --fmt deepmd/npy	Support wildcard, can be call multiple time
write	Use MultiSystems to merge dataset and write to directory	ai2-kit tool dpdata read ./path/to/dataset --fmt deepmd/npy - write ./path/to/merged_dataset
filter	Use lambda expression to filter dataset by system data.	See in Example
set_fparam	add fparam to dataset, can be float or list of float	See in Example
slice	use slice expression to process systems	see in Example
sample	sample data by different methods, current supported method are even and random	see in Example
eval	use deepmd DeepPot to (re)label loaded data	see in Example
to_ase	convert dpdata format to ase format and use ase tool to process	see in Example

Those commands are chainable and can be used to process trajectory in a pipeline fashion (separated by -). For more information, please refer to the following examples.

Example

# read multiple dataset generated by training workflow by wildcard and merge them into a single dataset
# you can also call `read` multiple times to read multiple dataset from different directory
ai2-kit tool dpdata read ./workdir/iters-*/train-deepmd/new_dataset/* --fmt deepmd/npy - write ./merged_dataset  --fmt deepmd/npy

# You can also save data with hdf5 format
ai2-kit tool dpdata read ./workdir/iters-*/train-deepmd/new_dataset/* --fmt deepmd/npy - write ./merged.hdf5 --fmt deepmd/hdf5

# Use lambda expression to filter outlier data
ai2-kit tool dpdata read ./path/to/dataset --fmt deepmd/npy - filter "lambda x: x['forces'].max() < 10" - write ./path/to/filtered_dataset

# Set fparam when reading data
ai2-kit tool dpdata read ./path/to/dataset --fmt deepmd/npy --fparam [0,1] - write ./path/to/new_dataset

# (re)label data
ai2-kit tool dpdata read dp-h2o --nolabel - eval dp-frozen.pb - write new-dp-hwo

# Drop the first 10 frames and then sample 10 frames use random method, and save it as xyz format
ai2-kit tool dpdata read dp-h2o - slice 10: - sample 10 --method random - to_ase - write h2o.xyz