WrongProportionsException raised if proportions are a list

[mmosc]

Hi!

In v1.0.1 calling the InteractionSegmentation with a list of proportions summing up to 1. sometimes (wrongly) raises the WrongProportionsException. However, if this list is first converted to a np.array and then passed to the segmentation, the Exception is not raised. (see attachments)

I therefore see two possible solutions:

1. Require the proportions argument to be a np.array (and not a list as it currently is)
2. Convert the proportions to a np.array at the beginning of the segment method

What do you think would be best, @giuliowaitforitdavide ?

Cheers,
Marta