add dpo training script

data/train_dpo.json

+[{"captions": "Rhythmic wooden table tapping overlaid with steady water pouring sound", "duration": 10.0, "chosen": "data/test.wav", "reject": "data/test.wav"}, {"captions": "Rhythmic wooden table tapping overlaid with steady water pouring sound", "duration": 10.0, "chosen": "data/test.wav", "reject": "data/test.wav"}, {"captions": "Rhythmic wooden table tapping overlaid with steady water pouring sound", "duration": 10.0, "chosen": "data/test.wav", "reject": "data/test.wav"}, {"captions": "Rhythmic wooden table tapping overlaid with steady water pouring sound", "duration": 10.0, "chosen": "data/test.wav", "reject": "data/test.wav"}, {"captions": "Rhythmic wooden table tapping overlaid with steady water pouring sound", "duration": 10.0, "chosen": "data/test.wav", "reject": "data/test.wav"}, {"captions": "Rhythmic wooden table tapping overlaid with steady water pouring sound", "duration": 10.0, "chosen": "data/test.wav", "reject": "data/test.wav"}, {"captions": "Rhythmic wooden table tapping overlaid with steady water pouring sound", "duration": 10.0, "chosen": "data/test.wav", "reject": "data/test.wav"}, {"captions": "Rhythmic wooden table tapping overlaid with steady water pouring sound", "duration": 10.0, "chosen": "data/test.wav", "reject": "data/test.wav"}, {"captions": "Rhythmic wooden table tapping overlaid with steady water pouring sound", "duration": 10.0, "chosen": "data/test.wav", "reject": "data/test.wav"}, {"captions": "Rhythmic wooden table tapping overlaid with steady water pouring sound", "duration": 10.0, "chosen": "data/test.wav", "reject": "data/test.wav"}]
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