In terms of recommendation effects,

In terms of recommendation effects, the results are still less satisfactory. The reason is that on the one hand, retrieved data are all about the records in 2012 (since the circulation system used by the unit could not store the borrowing history of overall readers, but could only inquire the borrowing records in 2012) and book information recommended by the system could not be found in the test records. It does not mean that readers do not borrow books in 2011 or 2010 or earlier times nor mean that they would not borrow books anymore. On the other hand, previous verification results demonstrate that user or item neighbor number has great influences on the recommendation effects. For example, while appropriately shortening neighbor number threshold value or book neighbor threshold value, the success ratio of corresponding book recommendation will increase too. In addition, according to the survey of the author, many readers’ library cards will be used by others for borrowing books. This influences the recommendation effects to some extent.