transformers onnx llama text-generation sparse chat deepsparse conversational dataset:cerebras/SlimPajama-627B dataset:HuggingFaceH4/ultrachat_200k arxiv:2405.03594 arxiv:2107.03374 base_model:neuralmagic/Llama-2-7b-ultrachat200k-pruned_70 base_model:quantized:neuralmagic/Llama-2-7b-ultrachat200k-pruned_70 autotrain_compatible region:us