We should add a check to make sure the input `pgen` for all Threads functions only contains one chromosome We then need a separate check verifying that the `region` parameter provided to `threads infer` uses the *correct* chromosome
We should add a check to make sure the input
pgenfor all Threads functions only contains one chromosomeWe then need a separate check verifying that the
regionparameter provided tothreads inferuses the correct chromosome