什么是 modes？

$X_n \to X$ almost surely if $\P(X_n \to X) = 1$; in probability if $\P(\abs{X_n - X} \geq \varepsilon) \to 0$ for every $\varepsilon > 0$; in $L^p$ if $\E\abs{X_n - X}^p \to 0$.