Solve Einstein five-house puzzle with owlready

[William]

I try to solve the well-known Einstein's five-house puzzle with owlready (http://udel.edu/~os/riddle-solution.html). But I met so much problem.
First I am not sure that it can be solved with how many statements. Second I do not know what is the best way to translate sentence such as "The person who lives in the green house likes drinking coffee". Third in 'lives in the side of the blue house', side means left or right, but I can not define it as `side = left | right`.

Does anybody can solve it with owlready?

I finished part of the puzzle.
with puzzle:
    class Person(Thing):
        # define content
        pass

    class Pet(Thing):
        pass

    class House(Thing):
        no = 0

    class Drink(Thing):
        pass

    class Smoke(Thing):
        pass

    class care(Person >> Pet, FunctionalProperty):
        pass

    class live(Person >> House, FunctionalProperty):
        pass

    class drink(Person >> Drink, FunctionalProperty):
        pass

    class take(Person >> Smoke, FunctionalProperty):
        pass

    class left(House >> House, FunctionalProperty):
        pass

    class right(House >> House, FunctionalProperty):
        inverse = left

    class side(House >> House):
         # right | left


e = Person('English')
s = Person('Sweden')
...

red = House('RedHouse')
...
dog = Pet('Dog')
...

coffee = Drink('Coffee')
...

pall = Smoke('PallMal')
...

e.live = red
s.care = dog
d.drink = tea
white.left = green
n.live.left = []
g.smoke = prince
n.live.side = blue

print(n.live)

[Jiba]

Hi,

I think this puzzle can be solved with an ontology (and thus with Owlready), using the reasoner.

For side, you can assert e.g.:

n.is_a.append( live.some( left.some(blue) | right.some(blue) ) )

Best regards,
Jiba

[cknoll]

I am reactivating this old question because I think it has great didactic potential. In fact others did also try to tackle this, e.g. see: <https://github.com/RDFLib/OWL-RL/issues/3>. There are two owl-files linked but with none of them I was able to get a meaningful solution. For easier comprehension of my steps I documented them in this notebook: <https://github.com/cknoll/demo-material/blob/master/expertise_system/einstein-zebra-puzzle-owlready-solution-attempt.ipynb>.

Conclusion: I can load the ontologies but I cannot confirm that the concepts are defined as `owl:oneOf`-objects nor can find where statements like

### statement 10
:Norwegian :livesIn :House1 .

or
### statement 15
:Norwegian :livesIn [ :isNextTo [ :hasColor :Blue ] ] .

ended up.

I would be glad for some hints.


I think, once the ontology is correctly represented the solution could be obtained via something like sync_reasoner_pellet(infer_property_values=True, infer_data_property_values=True)

Best,
Carsten

[cknoll]

Update:

The first ontology which was provided as XML works (my error on beforehand). Documented solution:

https://github.com/cknoll/demo-material/blob/master/expertise_system/einstein-zebra-puzzle-owlready-solution1.ipynb

However the second ontology file (provided in n3 turtle syntax) does not work. More precisely:

a) Direct loading: no classes or roles are loaded.

b) conversion to xml syntax with ontospy and then loading to owlready: classes and roles are loaded but no individuals.

Probably something in the file is wrong, but I would owlready expect to report some error then...

[sbin]

did you try loading the .n3 Ontology in Protégé and re-save it as OWL (RDF/XML)? Sometimes this can help (untested for the case!)