graphlab中.apply只处理前100个数

运行下列代码后，发现products新家的great列，只处理前100个数。

def great_count(word_count_vector):
    if 'great' in word_count_vector:
        return word_count_vector['great']
    else:
        return 0
products['great'] = products['word_count'].apply(great_count)
products['great'].show()

研究后发现，是apply的用法，当第二个参数dtype不设置时，就只计算前100个数，因此，使用时，需要加上dtype。如下

def great_count(word_count_vector):
    if 'great' in word_count_vector:
        return word_count_vector['great']
    else:
        return 0
products['great'] = products['word_count'].apply(great_count, int)
products['great'].show()