[BUG] Strange behavior when set `training`/`systems` in input.json

[iProzd]

Bug summary

See #1268 in dpgen.

The user provided the input.json in a strange format.
It has both training/systems and training/training_data/systems, the former is empty. Whatever the latter is, it will unexpectedly choose the empty training/systems.

To reproduce the bug, just add systems: [] in training scope in example/water/se_e2_a/input.json.

DeePMD-kit Version

2.2.2

TensorFlow Version

2.6.0

How did you download the software?

Offline packages

Input Files, Running Commands, Error Log, etc.

See above.

Steps to Reproduce

See above.

Further Information, Files, and Links

No response

[njzjz]

training/systems is the v1 key. It is an undefined behavior to have v1 and v2 parameters at the same time.