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吴恩达机器学习笔记40-用调和平均数F来进行查准率和 ...:2021-3-6 · 在很多应用中，我们希望能够保证查准率和查全率的相对平衡。我们可以将不同阀值情况下，查全率与查准率的关系绘制成图表，曲线的形状根据数据的不同而不同：我们希望有一个帮助我们选择这个阀值的方法。一种方法是计算F1值（F1Score），其计算公式为：我们选择使得F1值最高的阀值。

The health and safety of our visitors and staff is our top priority. We have implemented the following to ensure you have a safe experience:

• We are limiting the number of people in the Castle at any one time to allow for physical distancing.
• We will be open Wednesday through Sunday from 9:30am to 5:00pm daily – this will help us maintain our high standards of cleanliness and give you a safe and enjoyable experience.
• We have increased our cleaning schedule and will be disinfecting high touch and high traffic areas multiple times a day.
• Masks and/or face coverings are required for visitors and staff while onsite.