I have read several line-breaking inside align environment but I fail to deal with the bracket {}. LaTex seems not recognize \left\{ and \right\} belong to the same equation when I break the line.
\begin{align*}
s_{percent-log} (y,y') &= \frac{1}{3} \left\{ \frac{\min[\log(0+1),\log(1+1)]}{\max[\log(0+1),\log(1+1)]} \\
& \qquad + \frac{\min[\log(5+1),\log(4+1)]}{\max[\log(5+1),\log(4+1)]} \\
& \qquad + \frac{\min[\log(2+1),\log(2+1)]}{\max[\log(2+1),\log(2+1)]} \right\} \\
&\approx 0.46387 \\
d_{percent-log} (y,y') &\approx 0.53613
\end{align*}
