Semantic similarity error for same terms

[serbulent]

The semantic_similarity function produces division by zero error for same term pair. It might be fixed as below;

def semantic_similarity(go_id1, go_id2, godag, branch_dist=None):
    '''
        Finds the semantic similarity (inverse of the semantic distance)
        between two GO terms.
    '''
    dist = semantic_distance(go_id1, go_id2, godag, branch_dist)
    if dist == 0:
        return 1
    if dist is not None:
        return 1.0 / float(dist)
    return None

[dvklopfenstein]

Thank you for your interest in GOATOOLS, taking the time to write us and your patience.

I have implemented this fix. Thank you so much for bringing it to our attention.