fix: check if edge weights are between 0 and 1

[tristan-f-r]

Closes #237.

[tristan-f-r]

Actually, I do want to print out what the value is (don't want anyone to have to try to write a script or perhaps even a regex to try to find what the outlier value is)

[tristan-f-r]

[Do we have an established way of testing dataset parsing? A quick look says there isn't any, but it could be useful to add for e.g. #254]

[ntalluri]

This would be a good chance to add in a test for dataset parsing.

[tristan-f-r]

That sounds good - @ntalluri should I combine this PR and #254 and add some encapsulating dataset test file for the two in the resulting PR?

[ntalluri]

I would keep them separate for now as they target different things. We can plan to merge this pr before 254. I would add the test case here first then once merged, pull it into 254.