def is_negative_relation(rel):
    """
    Negative relations describe ways that concepts are different or unrelated.
    In cases where we our goal is to determine how related concepts are, such
    as conceptnet5.builders.reduce_assoc, we should disregard negative
    relations.
    """
    return rel.startswith('/r/Not') or rel == '/r/Antonym' or rel == '/r/DistinctFrom'