新华社悉尼2月27日电 （记者薛艳雯、李晓渝）第九届中国国际进口博览会（进博会）推介活动26日至27日在澳大利亚悉尼举行。来自澳多地的近100家机构和企业通过线上线下形式参加，共同探讨中澳经贸合作新机遇。
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在深度学习中，激活函数（Activation Function）是神经网络的灵魂。它不仅赋予网络非线性能力，还决定了训练的稳定性和模型性能。那么，激活函数到底是什么？为什么我们非用不可？有哪些经典函数？又该如何选择？
Despite an ultimatum from Defense Secretary Pete Hegseth, Anthropic said that it can't "in good conscience" comply with a Pentagon edict to remove guardrails on its AI, CEO Dario Amodei wrote in a blog post. The Department of Defense had threatened to cancel a $200 million contract and label Anthropic a "supply chain risk" if it didn't agree to remove safeguards over mass surveillance and autonomous weapons.
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