Re: Is there a problem with -Infinity as boost?
Thank you Walter. I liked your solution! This is what I was looking for i.e. boost=log(sum(1,qty)) O. O. Walter Underwood wrote The usual fix for this is log(1+qty). If you might have negative values, you can use log(max(1,qty)). wunder Walter Underwood wunder@ http://observer.wunderwood.org/ On Oct 20, 2014, at 3:04 PM, O. Olson lt; olson_ord@ gt; wrote: I am considering using a boost as follows: boost=log(qty) Where qty is the quantity in stock of a given product i.e. qty could be 0, 1, 2, 3, … etc. The problem I see is that log(0) is -Infinity. Would this be a problem for Solr? For me it is not a problem because log(0) log(1) log(2) etc. I'd be grateful for any thoughts. One alternative is to use max e.g. boost=max(log(qty), -1) But still this would cause Solr to compute the -Infinity and then discard it. So can I use an expression for boost that would result in –Infinity? Thank you O. O. -- View this message in context: http://lucene.472066.n3.nabble.com/Is-there-a-problem-with-Infinity-as-boost-tp4165036p4165189.html Sent from the Solr - User mailing list archive at Nabble.com.
Is there a problem with -Infinity as boost?
I am considering using a boost as follows: boost=log(qty) Where qty is the quantity in stock of a given product i.e. qty could be 0, 1, 2, 3, … etc. The problem I see is that log(0) is -Infinity. Would this be a problem for Solr? For me it is not a problem because log(0) log(1) log(2) etc. I'd be grateful for any thoughts. One alternative is to use max e.g. boost=max(log(qty), -1) But still this would cause Solr to compute the -Infinity and then discard it. So can I use an expression for boost that would result in –Infinity? Thank you O. O. -- View this message in context: http://lucene.472066.n3.nabble.com/Is-there-a-problem-with-Infinity-as-boost-tp4165036.html Sent from the Solr - User mailing list archive at Nabble.com.
Re: Is there a problem with -Infinity as boost?
The usual fix for this is log(1+qty). If you might have negative values, you can use log(max(1,qty)). wunder Walter Underwood wun...@wunderwood.org http://observer.wunderwood.org/ On Oct 20, 2014, at 3:04 PM, O. Olson olson_...@yahoo.it wrote: I am considering using a boost as follows: boost=log(qty) Where qty is the quantity in stock of a given product i.e. qty could be 0, 1, 2, 3, … etc. The problem I see is that log(0) is -Infinity. Would this be a problem for Solr? For me it is not a problem because log(0) log(1) log(2) etc. I'd be grateful for any thoughts. One alternative is to use max e.g. boost=max(log(qty), -1) But still this would cause Solr to compute the -Infinity and then discard it. So can I use an expression for boost that would result in –Infinity? Thank you O. O.
