// FIXME Make this faster
Long2ObjectMap<ScoreSource> chan = scores.getOrAddChannel(PREDICTION_SOURCE_SYMBOL);
for (VectorEntry e: scores) {
long key = e.getKey();
ScoreSource source = ScoreSource.PRIMARY;
if (fallbackKeys.contains(key)) {
source = ScoreSource.BASELINE;
}
chan.put(key, source);
}