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Theory and applications of probability and stochastic processes: e.g. central limit theorems, large deviations, stochastic differential equations, models from statistical mechanics, queuing theory.

3 votes
3 answers
460 views

$H(p) \le H(q) + KL(p, q)$?

Let $H(p) = \sum_i p_i\log\frac{1}{p_i}$ be the entropy of $p$ and $KL(p, q) = \sum_i p_i\log\frac{p_i}{q_i}$ be the KL divergence between $p$ and $q$. Does it hold that $H(p) \le H(q) + KL(p, q)$? I …
0 votes
1 answer
490 views

Optimal solution to cross entropy loss in the continuous case

This could be a simple question but I don't have a satisfying answer. Setup. Suppose that we have $K$ different classes, and consider cross entropy loss which maps a probability vector in the probabi …
3 votes
1 answer
237 views

Concentration of a modified random walk

Let $\varepsilon$ be a number in $(0, 1)$, consider the following random walk on the real line $X^{(0)}, X^{(1)}, \dots$, where $X^{(0)}=0$ If $X^{(t)} > 0$, then with probability $.5$, $X^{(t+1)} …