New issue 2772: Theano working nominally within pypy
https://bitbucket.org/pypy/pypy/issues/2772/theano-working-nominally-within-pypy
garming-sam:
In trying to find a decent ML library to work on pypy, I figured out some hacks
to get Theano working (at least superficially with runtime compiled cpyext
modules).
There seems to be a few problems that need to be resolved before it would work
out of the box:
1. A single usage of the ctypes.pythonapi.PyCapsule_Type
2. A single usage of sys.getrefcount (to check that there isn't leaks)
3. Missing build information to runtime load the compiled .so python module
- The correct binary .so filename looks to be able to be constructed using
distutils.sysconfig.get_config_var("SO") (or EXT_SUFFIX in python3)
- Expects libpython.so (or equivalent) in the
distutils.sysconfig.get_config_var("LIBDIR") location which does not exist
- distutils.sysconfig.get_config_var("LDLIBRARY") does not resolve in pypy
currently -- but should in theory point to libpypy-c
If this was to be fixed correctly, there's a few questions that I would expect
would be needed to be resolved:
1. Which method is best to runtime determine if the code is running under pypy?
2. Is distutils.sysconfig.get_config_var("LDLIBRARY") meant to return libpypy-c?
3. Is libpypy-c supposed to reside in LIBDIR?
In doing some similar testing around this area, I also noticed that there are
some config variables that exist in sysconfig that do not exist in
distutils.sysconfig (or vice versa) like INCLUDEDIR which make it difficult to
build cpython modules that can work against pypy.
The hacks I've done (for a specific version of pypy2) are in a branch here:
https://github.com/GSam/Theano/tree/pypy-hack
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