two problems about lwe_challenge.py

[s4lTea]

1.I see function def lwe() and def load_lwe_challenge coustruct a challenge to use,I don't want to use these txts,I just need lwe_challenge.py to solve specified txts.
What should I do? Put the txts in file lwechallenge? And how can I pass the data variable to deflwe_kernel?

2.When running n=180 lwechallenge, I see :

Chose 171 samples.Predict solution at bkz-55 + svp-87

It outputs a 172-dimensional vector, it's obviously e.
Then I can recover the problem by using e.
But what puzzles me is,
how were the 171 selected samples selected? Are they in a specific order？