attract-repel.py 文件源码

def distance(v1, v2, normalised_vectors=False):
    """
    Returns the cosine distance between two vectors. 
    If the vectors are normalised, there is no need for the denominator, which is always one. 
    """
    if normalised_vectors:
        return 1 - dot(v1, v2)
    else:
        return 1 - dot(v1, v2) / ( norm(v1) * norm(v2) )