 it is very hard to guarantee reproducibility on
externally managed hardware, like in a cluster or even a desktop
managed by an IT department or with automatic updates turned on.</p>
<p>If, however, you compiled a Stan program today using one set of flags,
took the computer away from the internet and didn’t allow it to update
anything, then came back in a decade and recompiled the Stan program
in the same way, you should get the same results.</p>
<p>The data needs to be the same down to the bit level. For