pdnnet.py 文件源码

def geoseries_sum(r, t_end, t_start):
    """
    Sum of r**t from t=t_start to t=t_end, inclusive

    :param r:
    :param t_end:
    :param t_start:
    :return:
    """
    # return ifelse(tt.eq(r, 1), (t_end-t_start+1).astype(theano.config.floatX), (r**(t_end+1)-r**t_start)/(r-1))
    return ifelse(tt.eq(r, 1), (t_end-t_start+1).astype(theano.config.floatX), (r**(t_end+1)-r**t_start)/(r-1))