allpairs script doesn't do all pairs

[ChameleonScales]

Hi, I just downloaded the master branch. The readme shows this command to calculate all pairs in the imgs directory :
python lpips_1dir_allpairs.py -d imgs/ex_dir_pair -o imgs/example_dists_pair.txt --use_gpu

I just precised python3 because 2 is the default on my system and removed --use-gpu because I have an AMD one :
python3 lpips_1dir_allpairs.py -d imgs/ex_dir_pair -o imgs/example_dists_pair.txt

The resulting file only contained 2 pairs instead of 3:

(ex_ref.png,ex_p0.png): 0.721881
(ex_p0.png,ex_p1.png): 0.719658
Avg: 0.720769 +/- 0.000786

[ChameleonScales]

Sorry I didn't notice there is an --all-pairs argument. Problem solved. Although, why would it do only those 2 by default? It seems counter-intuitive to me.