求翻译：we assume that the rating matrix is low-rank within certain neighborhoods of the metric space defined by (user, item) pairs是什么意思？

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we assume that the rating matrix is low-rank within certain neighborhoods of the metric space defined by (user, item) pairs

问题补充：

匿名	2013-05-23 12:21:38 我们假设评分矩阵是度量空间去的某些居民区由（用户，项目）对罚款内低秩

匿名	2013-05-23 12:23:18 正在翻译，请等待...

匿名	2013-05-23 12:24:58 我们假设，规定值矩阵是在度量空间之内低排列de用户罚款的的某些邻里 (，项目) 配对

匿名	2013-05-23 12:26:38 我们假定评级矩阵低秩内某些社区度量空间德处以罚款（用户、项目）对

匿名	2013-05-23 12:28:18 we assume that the rating matrix is low-rank within certain neighborhoods of the metric space defined by (user, item) pairs

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求翻译：we assume that the rating matrix is low-rank within certain neighborhoods of the metric space de fined by (user, item) pairs是什么意思？