### facenet math

Hello, i hope this is not too off topic but i want to try anyway please.

*Pre conditions*
I have:
* database filled with 128 floating vectors for different persons
* the vector is a unit vector (length of 1)

So i am able to calculate the distance for a given vector on the database (apache solr) successfully.
My naive approach calculates all distances and sorts by distance - which is working correctly.

Now my question:
**Is it possible to limit the records for a given max distance without calculating the distance for all records?**
I want to use fixed fields(no db functions) to make this prediction.

I tried so far : mean, variance, using anchor points but i see no correlation with the calculated distance.
Sorry - i am still learning but math is always a bit difficult for me (i try to improve).

Thank you + Greetings,
Holger