当我试图通过graphlab的sframe数据结构获取属于userid = 1列的数据集行时sf[sf['userid'] == 1]
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我得到了行,但是我也得到了这个消息,[? rows x 6 columns]
Note: Only the head of the SFrame is printed. This SFrame is lazily evaluated.
You can use sf.materialize() to force materialization.
我已经浏览了文档,但我无法理解 sf.materialize() 的作用!有人可以帮我吗?