kaivalnp commented on PR #15698: URL: https://github.com/apache/lucene/pull/15698#issuecomment-3887330446
> Individual dimensions of 4-bit quantized vectors are stored as packed nibbles (i.e. two dimensions in a single byte). Example: `[1 2][3 4][5 6][7 8]` Sorry for the confusion, I was mistaken here^ -- the "upper" half bits contain the first N/2 dimensions, and the "lower" half bits contain the next N/2 dimensions like: `[1 5][2 6][3 7][4 8]` However, the sudden drop in performance in the JMH benchmark still seems interesting -- but I'll pursue it separately -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
