Needed to downgrade `numpy` and reinstall `libllvmlite` & `numba`

[BBischof]

I tried installing vectorizers on a fresh pyenv and I got this error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "vectorizers-master/vectorizers/__init__.py", line 1, in <module>
    from .token_cooccurrence_vectorizer import TokenCooccurrenceVectorizer
  File "vectorizers/token_cooccurrence_vectorizer.py", line 1, in <module>
    from .ngram_vectorizer import ngrams_of
  File "vectorizers/ngram_vectorizer.py", line 2, in <module>
    import numba
  File "numba-0.54.1-py3.9-macosx-11.3-x86_64.egg/numba/__init__.py", line 19, in <module>
    from numba.core import config
  File "numba-0.54.1-py3.9-macosx-11.3-x86_64.egg/numba/core/config.py", line 16, in <module>
    import llvmlite.binding as ll
  File "llvmlite-0.37.0-py3.9.egg/llvmlite/binding/__init__.py", line 4, in <module>
    from .dylib import *
  File "llvmlite-0.37.0-py3.9.egg/llvmlite/binding/dylib.py", line 3, in <module>
    from llvmlite.binding import ffi
  File "llvmlite-0.37.0-py3.9.egg/llvmlite/binding/ffi.py", line 191, in <module>
    raise OSError("Could not load shared object file: {}".format(_lib_name))
OSError: Could not load shared object file: libllvmlite.dylib

This was resolvable for me by uninstalling and reinstalling libllvmlite & numba after ensuring numpy<1.21, e.g.

pip install numpy==1.20
pip uninstall libllvmlite
pip uninstall numba
pip install libllvmlite
pip install numba

This is obviously not a big deal, but in case others bump this, maybe a ref in the README can save them a google. 🤷

[lmcinnes]

Thanks. There seem to be some issues in general with numpy 1.21 and numba not quite playing together nicely. It seems to have been largely confined to Mac's as far as I know. Do you have an M1 Mac by any chance?

Regardless, thanks for the report and documenting a fix.

[BBischof]

Nah still on intel but yes on Mac hardware.