Nothing
ps <- c(0, 1, 1, 0, 1, 0, 0, 1, 0, 0)
qs <- c(0, 0, 0, 0, 0, 1, 1, 0, 0, 1)
cross_entropy(ps, qs) # 1.003530
cross_entropy(qs, ps) # 0.912454
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