Add stanford-oval/Llama-2-7b-WikiChat to eval queue

stanford-oval/Llama-2-7b-WikiChat_eval_request_False_bfloat16_Original.json

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+{"model": "stanford-oval/Llama-2-7b-WikiChat", "base_model": "", "revision": "main", "private": false, "precision": "bfloat16", "weight_type": "Original", "status": "PENDING", "submitted_time": "2024-06-19T05:44:13Z", "model_type": "\ud83d\udcac : chat models (RLHF, DPO, IFT, ...)", "likes": 25, "params": 6.738, "license": "llama2"}