Substitute to calling all directories manually in input.json

[JayKayNJIT]

**Dear DeePMD-kit Community,

I am trying to extend the water example to train using example input.json. I want to change following property values ["systems": ["../data/data_0/", "../data/data_1/", "../data/data_2/"],] into a general syntax so that I don't have to specify those directories individually as I have to give 500 directories corresponding to 500 training frames. I tried to follow the solutions I got about general JSON format[1] but they doesn't seems to work and result into errors[2].**

[1]
https://stackoverflow.com/questions/71891347/calling-all-directories-in-json

[2]
2022-04-17 01:10:17.786489: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcudart.so.11.0
WARNING:tensorflow:From /home/j/jk435/miniconda3/envs/deepmd/lib/python3.9/site-packages/tensorflow/python/compat/v2_compat.py:96: disable_resource_variables (from tensorflow.python.ops.variable_scope) is deprecated and will be removed in a future version.
Instructions for updating:
non-resource variables are not supported in the long term
WARNING:root:Environment variable KMP_BLOCKTIME is empty. Use the default value 0
WARNING:root:Environment variable KMP_AFFINITY is empty. Use the default value granularity=fine,verbose,compact,1,0
/home/j/jk435/miniconda3/envs/deepmd/lib/python3.9/importlib/init.py:169: UserWarning: The NumPy module was reloaded (imported a second time). This can in some cases result in small but subtle issues and is discouraged.
_bootstrap._exec(spec, module)
Traceback (most recent call last):
File "/home/j/jk435/miniconda3/envs/deepmd/bin/dp", line 10, in
sys.exit(main())
File "/home/j/jk435/miniconda3/envs/deepmd/lib/python3.9/site-packages/deepmd/entrypoints/main.py", line 437, in main
train_dp(**dict_args)
File "/home/j/jk435/miniconda3/envs/deepmd/lib/python3.9/site-packages/deepmd/entrypoints/train.py", line 84, in train
jdata = j_loader(INPUT)
File "/home/j/jk435/miniconda3/envs/deepmd/lib/python3.9/site-packages/deepmd/common.py", line 363, in j_loader
return json.load(fp)
File "/home/j/jk435/miniconda3/envs/deepmd/lib/python3.9/json/init.py", line 293, in load
return loads(fp.read(),
File "/home/j/jk435/miniconda3/envs/deepmd/lib/python3.9/json/init.py", line 346, in loads
return _default_decoder.decode(s)
File "/home/j/jk435/miniconda3/envs/deepmd/lib/python3.9/json/decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/home/j/jk435/miniconda3/envs/deepmd/lib/python3.9/json/decoder.py", line 353, in raw_decode
obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 43 column 1 (char 815)

[wanghan-iapcm]

You may provide a string specifying the root dir containing all directories to the "system" key. For example

"systems":  "/root/dir/to/all/sub/dirs", 

[JayKayNJIT]

That worked. Additionally, how I can specify something similar for validation_data instead of having to specify individual directories[1]

[1]
"systems": ["../data/data_3"],

[wanghan-iapcm]

You may do it in the same way as the training_data