Here follows some questions that I met in reading Pattern Recognition and Machine Intelligence. Hope to get through them in the next week:

- Why the Markov blanket of a node in a Bayesian network must include co-parents, whereas the Markov blanket of a node in a Markov Random Field includes only those direct neighbors. (ref. P383, Figure 8.26 and P385, Figure 8.28)
- Lagrange multiplier with constraint g(X)>0. “Now, however, the sign of the Lagrange multiplier is crucial, because the function f(x) will only be at a maximum if its gradient is oriented away from the region g(x) > 0, as illustrated in Figure E.3. We therefore have ∇f(x) = −λ∇g(x) for some value of λ > 0.“
- On variational inference (P465, Equation 10.6): how to dissect out the dependence on one of the factors q
_{j}(**Z**_{j}).
- Factor graphs and the sum-product algorithm (also known as belief propagation).
- Variational inference and expectation propagation.

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