Add std_thresholdoption to StepWiseGRPOAdvantageFn, to filter out zero-grad group samples.#363

pan-x-c merged 5 commits intoagentscope-ai:mainagentscope-ai/Trinity-RFT:mainfrom

garyzhang99:feature/dynamic_sampling_for_multistep_grpogaryzhang99/Trinity-RFT:feature/dynamic_sampling_for_multistep_grpoCopy head branch name to clipboard