Hmm… I am not sure how my rules are modeled. I just use the built-in OWL_MEM_MICRO_RULE_INF OntModelSpec.
Anyway, my question is still this: how do I get all of those inferences computed *before* I start querying the Model. It’s great if I can just store them later, but I still need to *compute* them before I can think about persisting anything. Running a single query doesn’t seem to compute them all, just relevant ones to that specific query… I think? > Den 2. jul. 2021 kl. 14.06 skrev Lorenz Buehmann > <buehm...@informatik.uni-leipzig.de>: > > But can't you do this inference just once and then somewhere store those > inferences? Next time you can simply load the inferred model instead of the > raw dataset. It is not specific to TDB, you can load dataset A, compute the > inferred model in a slow process once, materialize it as dataset B, and later > on always work on dataset B - this is standard forward chaining with writing > the data back to disk or database. Can you try this procedure, maybe it works > for you? > > Indeed this wont work if your rules are currently modeled as backward > chaining rules as those are computed at query time always. > > > On 02.07.21 13:37, Simon Gray wrote: >> Thank you Lorenz, although this seems to be a reply to my side comment about >> TDB rather than the question I had, right? >> >> The main issue right now is that I would like to use inferencing to get e.g. >> inverse relations, but doing this is very slow the first time a query is >> run, likely due to some preprocessing step that needs to run first. I would >> like to run the preprocessing step in advance rather than running it >> implicitly. >> >>> Den 2. jul. 2021 kl. 13.30 skrev Lorenz Buehmann >>> <buehm...@informatik.uni-leipzig.de>: >>> >>> you can just add the inferred model to the dataset, i.e. add all triple to >>> your TDB. Then you can disable the reasoner afterwards or just omit the >>> rules that you do not need anymore >>> >>> On 02.07.21 13:13, Simon Gray wrote: >>>> Hi there, >>>> >>>> I’m using Apache Jena from Clojure to create new home for the Danish >>>> WordNet. I use the Arachne Aristotle library + some additional Java >>>> interop code of my own. >>>> >>>> I would like to use OWL inferencing to query e.g transitive or inverse >>>> relations. This does seem to work fine although I’ve only tried using the >>>> supplied in-memory model for now (and it looks like I will have to create >>>> my own instance of a ModelMaker to integrate with TDB 1 or 2). >>>> >>>> However, the first query always seems to run really, really slow. Is there >>>> any way to precompute inferred relations so that I don’t have to wait? >>>> I’ve tried calling `rebind` and `prepare`, but they don’t seem to do >>>> anything. >>>> >>>> Kind regards, >>>> >>>> Simon Gray >>>> Research Officer >>>> Centre for Language Technology, University of Copenhagen >>>> >>
