item超过2万后报错

不知道是item还是整体数量的问题。

测试条件：不报错
用户数量 | 5000
物品数量 | 10000
反馈数量 | 20000

测试条件：不报错
用户数量 | 10000
物品数量 | 20000
反馈数量 | 40000

#### 测试条件： 此时控制台报如下截图错误
用户数量 | 50000
物品数量 | 50000
反馈数量 | 40000


### 查看master的日志
```
{"level":"error","ts":1694944835.8019342,"msg":"failed to searching neighbors of items","error":"redis: can't parse int reply: \"*0\"","errorVerbose":"redis: can't parse int reply: \"*0\"\ngithub.com/zhenghaoz/gorse/master.(*Master).findItemNeighborsIVF.func4:505: \ngithub.com/zhenghaoz/gorse/base/parallel.DynamicParallel:124: \ngithub.com/zhenghaoz/gorse/master.(*Master).findItemNeighborsIVF:519: "}
{"level":"error","ts":1694945873.25644,"msg":"failed to load item categories","error":"redis: can't parse array/set/push reply: \"$1\""}
```