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While Gelidium seaweeds can be collected by gathering fragments washed ashore, mass production of agar requires steady, large quantities.10 Harvesters in New Zealand during WWII had to “walk beside a boat, waist to armpit deep in water and feel for the weed with their feet.” Handling large volumes of wet seaweed (which yields less than five percent agar) was challenging. Then as now, when Gelidium is harvested by scuba divers from rocky seabeds, collectors have to understand the life cycle of the algae, find the most likely locations for its growth, and prevent overharvesting to safeguard future yields.
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激活函数虽然只是神经元里的一小步，但却是深度学习的一大步。没有它，深度学习就不会有今天的辉煌。它让神经网络从“线性堆叠”变成了真正的“非线性智能体”，能够处理复杂的视觉、语言和跨模态任务。