MeshyOA #2

Q2. KL-divergence (MCQ)

估计简单概念题评测数据准备中，可先阅读题面

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Which characterizes the Kullback-Leibler divergence D(P || Q)?

D(P || Q) is symmetric, D(P || Q) = D(Q || P).
D(P || Q) satisfies the triangle inequality (true metric).
D(P || Q) is always non-negative and equals zero iff P and Q are identical almost everywhere. <- correct
D(P || Q) can be negative if P has nonzero probability where Q is zero.