"start_pref_f" not support on DeepMD-kit v2.0.1 gpu cuda 11.3

[wanghan-iapcm]

Discussed in #1197

^{Originally posted by Franklalalala October 8, 2021}
I saw this feature in the code, loss function, which is exactly what i'm looking for. Since my data is not from md trajectory, most of the atoms have a extremely low force. Apply this "atom prefernce" feature may greatly improve the force prediction.
I've seen this.
#358
And checked my data with this
#709
I've tried this feature on my cpu version, the results looks acceptable. However, I can't run it with GPU version. BUG is: ArgumentKeyError: [at location loss] undefined key start_pref_pf is not allowed in strict mode.
What can i do to implement this feature with GPU? Lower my version? If so, which version? Thanks!

[wanghan-iapcm]

@njzjz we have missed the start_pref_pf option in argument check. Could you please fix it ? Thanks!