Requests for technical support from the VASP group should be posted in the VASP-forum.

# ML AFILT2

(Redirected from ML FF AFILT2 MB)

ML_AFILT2 = [real]
Default: ML_AFILT2 = 0.002

Description: This tag sets the filtering parameter for the angular filtering for ML_IAFILT2 in the machine learning force field method.

This tag is only used if ML_LAFILT2=.TRUE. and ML_IAFILT2=2 are used.

The angular filtering function[1] for ML_IAFILT2=2 is described as ${\displaystyle \eta _{l,a_{\mathrm {FILT} }}={\frac {1}{1+a_{\mathrm {FILT} }[l(l+1)]^{2}}}}$. The tag ML_AFILT2 sets the parameter ${\displaystyle a_{\mathrm {FILT} }}$.

## References

1. [ J. P. Boyd, Chebyshev and Fourier Spectral Methods (Dover Publications, New York, 2000).]