Is there a penalty to interrupting training? [duplicate]

I have several dwellers who train high SPECIAL attributes, but are needed elsewhere at times (someone has to keep the lights on).

I have noticed that, most of the time (I haven't checked for all scenarios), training times resume back where I left them if the dweller was interrupted or made to work elsewhere; it is as if the system is tracking how much training has been done and getting the dweller back on track.

Is training investment wasted on a dweller if it is interrupted for significant amounts of time for other tasks (including death and exploration)?