智能AI None 基础模型嵌入是否可以提高跨国作物产量泛化？撒哈拉以南非洲地区的“留一国”评估 arXiv:2605.08113v1 Announce Type: new Abstract: Accurate predictions of smallholder maize yields across national boundar country cross for 2026-05-12 Yaw Osei Adjei