add RAFT

[DearAJ]

Set "adv_estimator": "raft" in config.algorithm to enable support for the RAFT algorithm.

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[XufangLuo]

Why three paddings (here and L514, L577) are needed?

[XufangLuo]

even labels are specified here. will these labels be used by the following update_actor method? or will they be used as expected?

[XufangLuo]

the called update_actor function is still the RL one, not the one in "SFTTrainer"? not sure if verl has SFTTrainer...

[DearAJ]

Verl does not have a SFTrainer. SFTrainer inherits from transformers.Trainer and requires the complete HuggingFace Trainer infrastructure, whereas VERL uses Ray distributed training and a custom worker group. Directly adopting SFTrainer would disrupt VERL's existing architecture. Additionally, SFTrainer and VERL use different data formats.

[XufangLuo]

why clipping can be disabled by setting them to 1.0? This might not be related to RAFT.