Can I Owlready2 pickable?

[Damiano]

Hi Owlready2 users,

Owlready2 helps me handle many OWL at the same time. Very helpful.

But big owl files cause long time when I call load(). I think dumping to a binary file using

pickle module is one of the best ways.

Can I make Owlready2 class pickable (serializable) ?

Thank you in advance.

[Jiba]

Hi,

I'm not sure the class can be easily pickled.

However, if you want to solve your loading time problem, the easiest solution is to save the quadstore (which is actually a SQLite3 database) in a local file. Loading a saved quadstore take only a fraction of second, independently of the size of the quadstore.

You can do:

default_world.set_backend(filename = "/path/to/your/file.sqlite3")

to store the quadstore in the given file, and then use default_world.save() to write the file.

More info are available in the doc here:

http://owlready2.readthedocs.io/en/latest/world.html#persistent-world-storing-the-quadstore-in-an-sqlite3-file

The only limit is that you cannot save each ontology in a separate quadstore: you need to put everything in the same file. But yoy can safely put all ontologies in the same quadstore, unless they are really big.

Jiba

[Damiano]

Dear Jiba,


Ii is much faster! 60 seconds for 4 big ontologies to load to only 3 seconds. Thank you for the advice.


Damiano