Here is a section of Machine Learning: a Probabilistic Perspective by Kevin Patrick Murphy I don't understand in (19.18) why there is a negative sign. For me, $\log ...
Let $G = (V,E)$ be a directed acyclic graph. Let $i \rightarrow j$ be an edge such that the parents of $j$ are exactly: the parents of $i$, and $i$. Let $L\left(G \right)$ be the set defined ...