how to regenerate src SV classes after modifying scripts in riscv-dv/pygen/pygen-src/*py

[svasekar]

HI,
I am tryingn to add new target and fore that i have changed pygen/pygen_src/riscv_instr_gen_config.py, riscv_instr_pkg.py,= and few more. I want tor regenerate the SV classes and want to see my script changes to effect to classes, for example modified constraint on gpr.
%run-dv pythong3 run.py is completing however the src SV classes are not changing.