Test Data preparation Issue

[Chinafsh]

I downloaded the habitat-test-scenes dataset and did the steps in habitat_sim

what I get is below

but in the process of create PairDatasets , it needs a "pairs.txt". The question is How to get the "pairs.txt" ? @PhilippeWeinzaepfel @rbregier @beanmilk @seyoung-hyun @yocabon Thx first anyway.