Function sequence

pattern/vector/__init__.py:1599–1608

Yields an infinite sequence, for example: sequence() => 0, 1, 2, 3, ... sequence(1.0, lambda i: i/2) => 1, 0.5, 0.25, 0.125, ...

(i=0, f=lambda i: i+1)

        return "Cluster(%s)" % list.__repr__(self)[1:-1]

def sequence(i=0, f=lambda i: i+1):
    """ Yields an infinite sequence, for example:
        sequence() => 0, 1, 2, 3, ...
        sequence(1.0, lambda i: i/2) => 1, 0.5, 0.25, 0.125, ...
    """
    # Used to generate unique vector id's in hierarchical().
    # We cannot use Vector.id, since the given vectors might be plain dicts.
    # We cannot use id(vector), since id() is only unique for the lifespan of the object.
    while True: 
        yield i; i=f(i)

def hierarchical(vectors, k=1, iterations=1000, distance=COSINE, **kwargs):
    """ Returns a Cluster containing k items (vectors or clusters with nested items).