Cross Entropy and Perplexity in NLP
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如果一个随机变量 X~p(x), q(x) 为用于近似p(x)的概率分布,那么随机变量p和模型q的交叉熵定义为:
H(X,q) = H(X) + D(p||q) = -/sigma_{x}p(x)log q(x),
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