is_dag is failing

[mchikina]

I am getting the following error. I have more features than samples in case this matters. Could this possible issue a warning as opposed to an error?
Traceback (most recent call last):
File "/home/mchikina/anaconda3/bin/notears_linear", line 26, in
main(args)
File "/home/mchikina/anaconda3/bin/notears_linear", line 10, in main
assert utils.is_dag(W_est)
AssertionError