DefinedNamespaceMeta.__getitem__ is slow #1717
Description
An attempt to process https://schema.org vocabulary via OWL RL library takes approximately 1 minute 50 seconds on my machine: https://gist.github.com/anatoly-scherbakov/6deac9b7540ecacc723603d83d2d9cee
According to the profiler output, the functions that take a lot of time is __getitem__ method of DefinedNamespaceMeta class:
ncalls tottime percall cumtime percall filename:lineno(function)
8510246 14.562 0.000 26.914 0.000 __init__.py:216(__contains__)
8510246 11.345 0.000 62.434 0.000 __init__.py:190(__getitem__)
I believe __getitem__ calls __contains__. I propose to cache __getitem__() to trade some RAM for better performance. After wrapping this into @lru_cache my result is this:
ncalls tottime percall cumtime percall filename:lineno(function)
9383995 5.253 0.000 5.253 0.000 term.py:144(__eq__)
4223629 5.252 0.000 15.734 0.000 memory.py:305(triples)
4223629 3.033 0.000 19.109 0.000 graph.py:453(triples)
8510244 2.662 0.000 2.662 0.000 __init__.py:206(__getattr__)
2459789 1.992 0.000 3.496 0.000 memory.py:496(__get_context_for_triple)
187389 1.950 0.000 5.611 0.000 OWLRL.py:854(_schema_vocabulary)
1797391 1.821 0.000 3.130 0.000 memory.py:521(__ctx_to_str)
187389 1.632 0.000 18.468 0.000 OWLRL.py:369(_equality)
187389 1.513 0.000 3.594 0.000 OWLRL.py:435(_properties)
187389 1.490 0.000 3.139 0.000 OWLRL.py:637(_classes)
and total execution time is down to approximately 40 seconds. We can see now that the concerned methods aren't even in the top 10.