什么是共轭先验分布?

“`” 参考回答：

假设<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552620116270_1C442D3875E749F08F3A423E76A4F05C"">为总体分布中的参数,<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552620076109_BF16EA28BE27AB41BEEF50E93A0A40CA"">的先验密度函数为<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552620136750_F6C5D0F1930B964FFEA89DDF696882A1"">,而抽样信息算得的后验密度函数与<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552620177179_1E85417CAFB6E126FC164557E874F041"">具有相同的函数形式,则称<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552620200305_FE5C121DE1782542C49C90C992320882"">为<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552620224564_CB64FF4F9ABB3A6860F6198E1DF33320"">的共轭先验分布。

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