Run eval on CPU instead of GPU

[prasad83]

Use --gpu-device as -1

python eval_human_eval.py \
	--model_name_or_path PyCodeGPT-110M/ \
	--output_dir results/ \
	--num_completions 100 \
	--temperature 0.2 \
	--top_p 0.95 \
	--max_new_tokens 100 \
	--gpu_device -1