Speedups by avoiding inner classes #616
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sn6uv
reviewed
Oct 8, 2016
| return True | ||
| else: | ||
| return expr.head.is_free(form, evaluation) and all( | ||
| leaf.is_free(form, evaluation) for leaf in expr.leaves) |
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is this function related to the change?
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I forgot to hook this up. It's done now. I needed to move this function into patterns.py as the declaration of _StopGeneratorBaseExpressionIsFree needs StopGenerator which cannot be imported into core.expression.py as patterns.py depends on core.expression.py.
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Turns out that, at least in CPython, declaring
classes inside functions is quite slow.Running
x = Range[50000]; First[Timing[Position[x, 10000]]]without this PR gives1.16326, with this PR, it gives0.461211. This is only due to one innerclassdefinition.Running the profiler, one actually sees Python's class build function popping up. So this PR moves inner classes out of functions at several places.