[DPO] add reference log-prob outputs in DPO#521
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## Summary <!--- This is a required section; please describe the main purpose of this proposed code change. ---> #521 introduced a unit test failure caused by the numerical issue in bf16. This PR relaxes the atol for `chosen_rewards` and `rejected_rewards` only. Note: It's just a temporary fix for ci. This PR also removes duplicated calculations on both terms. <!--- ## Details This is an optional section; is there anything specific that reviewers should be aware of? ---> ## Testing Done <!--- This is a required section; please describe how this change was tested. ---> <!-- Replace BLANK with your device type. For example, A100-80G-PCIe Complete the following tasks before sending your PR, and replace `[ ]` with `[x]` to indicate you have done them. --> - Hardware Type: <BLANK> - [ ] run `make test` to ensure correctness - [ ] run `make checkstyle` to ensure code style - [ ] run `make test-convergence` to ensure convergence --------- Co-authored-by: Austin Liu <austin362667@gmail.com>
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Summary
Since the DPO uses a reference model we also need to return the reference logprobs in DPO
Testing Done
make testto ensure correctnessmake checkstyleto ensure code stylemake test-convergenceto ensure convergence