Does gps implement importance sampling?

Hi,

Does gps implement importance sampling when sampling a distribution that covers several orders of magnitude?

I have inputted my distribution using the following gps commands:

/gps/ene/type Arb
/gps/hist/type arb
/gps/ene/diffspec true
/gps/hist/file input_distribution.txt
/gps/hist/inter Log

Thanks!