gleu.py 文件源码

def gleu(self, stats, smooth=False):
        """Compute GLEU from collected statistics obtained by call(s) to gleu_stats"""
        # smooth 0 counts for sentence-level scores
        if smooth:
            stats = [s if s != 0 else 1 for s in stats]
        if len(filter(lambda x: x == 0, stats)) > 0:
            return 0
        (c, r) = stats[:2]
        log_gleu_prec = sum([math.log(float(x) / y)
                             for x, y in zip(stats[2::2], stats[3::2])]) / 4
        for i, (x, y) in enumerate(zip(stats[2::2], stats[3::2])) :
            pass
            #print 'Precision', i+1, '=', x, '/', y, '=', 1.*x/y
#        log_gleu_prec = sum([math.log(float(x) / y)
#                             for x, y in zip(stats[2::2], stats[3::2])]) / 4

        return math.exp(min([0, 1 - float(r) / c]) + log_gleu_prec)