Add Salesforce/xgen-7b-4k-base to eval queue

Salesforce/xgen-7b-4k-base_eval_request_False_float32_Original.json

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+{"model": "Salesforce/xgen-7b-4k-base", "base_model": null, "revision": "e5842215153cadc47318560dee2fc044d29b75f0", "precision": "float32", "params": 7.0, "architectures": "LlamaForCausalLM", "weight_type": "Original", "status": "PENDING", "submitted_time": "2024-06-12T13:26:51Z", "model_type": "pretrained", "job_id": -1, "job_start_time": null, "use_chat_template": false}