By the way, a meeting has been scheduled for 1920 UTC on Thursday, 4-February-2016 to go into technical specifics on PageImages.
Email me off list if you'd like to be added to the meeting. -Adam ---------- Forwarded message ---------- From: Adam Baso <ab...@wikimedia.org> Date: Sat, Jan 30, 2016 at 8:11 AM Subject: Re: [WikimediaMobile] Similar articles feature performance in CirrusSearch for apps and mobile web To: Erik Bernhardson <ebernhard...@wikimedia.org> Cc: Joaquin Oltra Hernandez <jhernan...@wikimedia.org>, mobile-l < mobile-l@lists.wikimedia.org> Okay. As per https://phabricator.wikimedia.org/T124225#1984080 I think if we're doing near term experimentation with a controlled A/B test the Android app is the only logical place to start. Dmitry, can that work for you? It's not required, but I think it would be neat to see if we can move the needle even more. Of course your quarterly goals take top priority...but what do you think? On Sat, Jan 23, 2016 at 5:58 AM, Adam Baso <ab...@wikimedia.org> wrote: > Hey all, am planning to look at Phabricator tasks and provide a reply > during the upcoming weekdays. Just wanted to acknowledge I saw your replies! > > > On Friday, January 22, 2016, Erik Bernhardson <ebernhard...@wikimedia.org> > wrote: > >> On Thu, Jan 21, 2016 at 1:29 AM, Joaquin Oltra Hernandez < >> jhernan...@wikimedia.org> wrote: >> >>> Regarding the caching, we would need to agree between apps and web about >>> the url and smaxage parameter as Adam noted so that the urls are >>> *exactly* the same to not bloat varnish and reuse the same cached >>> objects across platforms. >>> >>> It is an extremely adhoc and brittle solution but seems like it would be >>> the greatest win. >>> >>> 20% of the traffic from searches by being only in android and web beta >>> seems a lot to me, and we should work on reducing it, otherwise when it >>> hits web stable we're going to crush the servers, so caching seems the >>> highest priority. >>> >>> To clarify its 20% of the load, as opposed to 20% of the traffic. But >> same difference :) >> >> >>> Let's chime in https://phabricator.wikimedia.org/T124216 and continue >>> the cache discussion there. >>> >>> Regarding the validity of results with opening text only, how should we >>> proceed? Adam? >>> >>> I've put together https://phabricator.wikimedia.org/T124258 to track >> putting together an AB test that measures the difference in click through >> rates for the two approaches. >> >> >> >>> On Wed, Jan 20, 2016 at 9:34 PM, David Causse <dcau...@wikimedia.org> >>> wrote: >>> >>>> Hi, >>>> >>>> Yes we can combine many factors, from templates (quality but also >>>> disambiguation/stubs), size and others. >>>> Today cirrus uses mostly the number of incoming links which (imho) is >>>> not very good for morelike. >>>> On enwiki results will also be scored according the weights defined in >>>> https://en.wikipedia.org/wiki/MediaWiki:Cirrussearch-boost-templates. >>>> >>>> I wrote a small bash to compare results : >>>> https://gist.github.com/nomoa/93c5097e3c3cb3b6ebad >>>> Here is some random results from the list (Semetimes better, sometimes >>>> worse) : >>>> >>>> $ sh morelike.sh Revolution_Muslim >>>> Defaults >>>> "title": "Chess", >>>> "title": "Suicide attack", >>>> "title": "Zachary Adam Chesser", >>>> ======= >>>> Opening text no boost links >>>> "title": "Hungarian Revolution of 1956", >>>> "title": "Muslims for America", >>>> "title": "Salafist Front", >>>> >>>> $ sh morelike.sh Chesser >>>> Defaults >>>> "title": "Chess", >>>> "title": "Edinburgh", >>>> "title": "Edinburgh Corn Exchange", >>>> ======= >>>> Opening text no boost links >>>> "title": "Dreghorn Barracks", >>>> "title": "Edinburgh Chess Club", >>>> "title": "Threipmuir Reservoir", >>>> >>>> $ sh morelike.sh Time_%28disambiguation%29 >>>> Defaults >>>> "title": "Atlantis: The Lost Empire", >>>> "title": "Stargate", >>>> "title": "Stargate SG-1", >>>> ======= >>>> Opening text no boost links >>>> "title": "Father Time (disambiguation)", >>>> "title": "The Last Time", >>>> "title": "Time After Time", >>>> >>>> >>>> >>>> >>>> >>>> Le 20/01/2016 19:34, Jon Robson a écrit : >>>> >>>>> I'm actually interested to see whether this yields better results in >>>>> certain examples where the algorithm is lacking [1]. If it's done as >>>>> an A/B test we could even measure things such as click throughs in the >>>>> related article feature (whether they go up or not) >>>>> >>>>> Out of interest is it also possible to take article size and type into >>>>> account and not returning any morelike results for things like >>>>> disambiguation pages and stubs? >>>>> >>>>> [1] https://www.mediawiki.org/wiki/Topic:Swsjajvdll3pf8ya >>>>> >>>>> >>>>> On Wed, Jan 20, 2016 at 9:47 AM, Adam Baso <ab...@wikimedia.org> >>>>> wrote: >>>>> >>>>>> One thing we could do regarding the quality of the output is check >>>>>> results >>>>>> against a random sample of popular articles (example approach to find >>>>>> some >>>>>> articles) on mdot Wikipedia. Presuming that improves the quality of >>>>>> the >>>>>> recommendations or at least does not degrade them, we should consider >>>>>> adding >>>>>> the enhancement task to a future sprint, with further instrumentation >>>>>> and >>>>>> A/B testing / timeboxed beta test, etc. >>>>>> >>>>>> Joaquin, smaxage (e.g., 24 hour cached responses) does seem a good >>>>>> fix for >>>>>> now for further reduction of client perceived wait, at least for >>>>>> non-cold >>>>>> cache requests, even if we stop beating up the backend. Does anyone >>>>>> know of >>>>>> a compelling reason to not do that for the time being? The main thing >>>>>> that >>>>>> comes to mind as always is growing the Varnish cache object pool - >>>>>> probably >>>>>> not a huge deal while the thing is only in beta, but on the stable >>>>>> channel >>>>>> maybe noteworthy because it would run on probably most pages (but >>>>>> that's >>>>>> what edge caches are for, after all). >>>>>> >>>>>> Erik, from your perspective does use of smaxage relieve the backend >>>>>> sufficiently? >>>>>> >>>>>> If we do smaxage, then Web, Android, iOS should standardize their >>>>>> URLs so we >>>>>> get more cache hits at the edge across all clients. Here's the URL I >>>>>> see >>>>>> being used on the web today from mobile web beta: >>>>>> >>>>>> >>>>>> https://en.m.wikipedia.org/w/api.php?action=query&format=json&formatversion=2&prop=pageimages%7Cpageterms&piprop=thumbnail&pithumbsize=80&wbptterms=description&pilimit=3&generator=search&gsrsearch=morelike%3ACome_Share_My_Love&gsrnamespace=0&gsrlimit=3 >>>>>> >>>>>> >>>>>> -Adam >>>>>> >>>>>> On Wed, Jan 20, 2016 at 7:45 AM, Joaquin Oltra Hernandez >>>>>> <jhernan...@wikimedia.org> wrote: >>>>>> >>>>>>> I'd be up to it if we manage to cram it up in a following sprint and >>>>>>> it is >>>>>>> worth it. >>>>>>> >>>>>>> We could run a controlled test against production with a long batch >>>>>>> of >>>>>>> articles and check median/percentiles response time with repeated >>>>>>> runs and >>>>>>> highlight the different results for human inspection regarding >>>>>>> quality. >>>>>>> >>>>>>> It's been noted previously that the results are far from ideal >>>>>>> (which they >>>>>>> are because it is just morelike), and I think it would be a great >>>>>>> idea to >>>>>>> change the endpoint to a specific one that is smarter and has some >>>>>>> cache (we >>>>>>> could do much more to get relevant results besides text similarity, >>>>>>> take >>>>>>> into account links, or see also links if there are, etc...). >>>>>>> >>>>>>> As a note, in mobile web the related articles extension allows >>>>>>> editors to >>>>>>> specify articles to show in the section, which would avoid queries to >>>>>>> cirrussearch if it was more used (once rolled into stable I guess). >>>>>>> >>>>>>> I remember that the performance related task was closed as resolved >>>>>>> (https://phabricator.wikimedia.org/T121254#1907192), should we >>>>>>> reopen it or >>>>>>> create a new one? >>>>>>> >>>>>>> I'm not sure if we ended up adding the smaxage parameter (I think we >>>>>>> didn't), should we? To me it seems a no-brainer that we should be >>>>>>> caching >>>>>>> this results in varnish since they don't need to be completely up to >>>>>>> date >>>>>>> for this use case. >>>>>>> >>>>>>> On Tue, Jan 19, 2016 at 11:54 PM, Erik Bernhardson >>>>>>> <ebernhard...@wikimedia.org> wrote: >>>>>>> >>>>>>>> Both mobile apps and web are using CirrusSearch's morelike: feature >>>>>>>> which >>>>>>>> is showing some performance issues on our end. We would like to >>>>>>>> make a >>>>>>>> performance optimization to it, but before we would prefer to run >>>>>>>> an A/B >>>>>>>> test to see if the results are still "about as good" as they are >>>>>>>> currently. >>>>>>>> >>>>>>>> The optimization is basically: Currently more like this takes the >>>>>>>> entire >>>>>>>> article into account, we would like to change this to take only the >>>>>>>> opening >>>>>>>> text of an article into account. This should reduce the amount of >>>>>>>> work we >>>>>>>> have to do on the backend saving both server load and latency the >>>>>>>> user sees >>>>>>>> running the query. >>>>>>>> >>>>>>>> This can be triggered by adding these two query parameters to the >>>>>>>> search >>>>>>>> api request that is being performed: >>>>>>>> >>>>>>>> cirrusMltUseFields=yes&cirrusMltFields=opening_text >>>>>>>> >>>>>>>> >>>>>>>> The API will give a warning that these parameters do not exist, but >>>>>>>> they >>>>>>>> are safe to ignore. Would any of you be willing to run this test? >>>>>>>> We would >>>>>>>> basically want to look at user perceived latency along with click >>>>>>>> through >>>>>>>> rates for the current default setup along with the restricted setup >>>>>>>> using >>>>>>>> only opening_text. >>>>>>>> >>>>>>>> Erik B. >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> Mobile-l mailing list >>>>>>>> Mobile-l@lists.wikimedia.org >>>>>>>> https://lists.wikimedia.org/mailman/listinfo/mobile-l >>>>>>>> >>>>>>>> >>>>>> _______________________________________________ >>>>>> Mobile-l mailing list >>>>>> Mobile-l@lists.wikimedia.org >>>>>> https://lists.wikimedia.org/mailman/listinfo/mobile-l >>>>>> >>>>>> _______________________________________________ >>>>> Mobile-l mailing list >>>>> Mobile-l@lists.wikimedia.org >>>>> https://lists.wikimedia.org/mailman/listinfo/mobile-l >>>>> >>>> >>>> >>>> _______________________________________________ >>>> Mobile-l mailing list >>>> Mobile-l@lists.wikimedia.org >>>> https://lists.wikimedia.org/mailman/listinfo/mobile-l >>>> >>> >>> >>> _______________________________________________ >>> Mobile-l mailing list >>> Mobile-l@lists.wikimedia.org >>> https://lists.wikimedia.org/mailman/listinfo/mobile-l >>> >>> >>
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