A message can be added to a list of messages attached to a matrix, a section, or a list of cells, to convey a warning or to notify the user of an error.
消息可以添加到一个矩阵、一个部分或一组单元格的消息列表中，用来传达警告或通知用户有错误。
In a very simplistic situation where a user-base application is CPU bound, it would be ideal to create a matrix that compares processor allocation to a reasonable number of concurrent users.
在用户应用程序受限于CPU的情况下，建立一个基准比较处理器的分配和合理的并发用户数非常理想。
The sparse user-item matrix often hurts the performance of recommendation system.
用户评分矩阵稀疏问题影响协同过滤的推荐性能。
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