Newer versions of numpy (>= 1.12.0) does not accept float as array index

[Mestrace]

Encountered this problem on pyBN/pyBN/classes/factor.py, method reduce_factor
` 585 """
586 exp_len = len(self.cpt)/float(self.card[rv])
--> 587 new_cpt = np.zeros((exp_len,))
588
589 val_idx = self.bn.F[rv]['values'].index(val)

TypeError: 'float' object cannot be interpreted as an index`

In line 587, the exp_len will be type float and the newer version of numpy does not accept it.

From numpy release note:

DeprecationWarning to error

Indexing with floats raises IndexError, e.g., a[0, 0.0].
Indexing with non-integer array_like raises IndexError, e.g., a['1', '2']
Indexing with multiple ellipsis raises IndexError, e.g., a[..., ...].
Non-integers used as index values raise TypeError, e.g., in reshape, take, and specifying reduce axis.

I reinstall the numpy==1.11.3 and that fixed the problem. But I suggest that the type should be cast to int, and there might be other places that has the same problem, too.