using numba with scipy.integrate.quad

[wkblack]

There seems to be a problem with numba, using scipy's integrate function. Here's a minimal example:

# minimal reproduction of jit failure

from scipy import integrate
from numba import jit
 
@jit
def r(zf):
  return integrate.quad(lambda z: z,1,zf)

print(r(.5))

Here's a copy of the error message:

Traceback (most recent call last):
  File "min.py", line 10, in <module>
    print r(.5)
  File "/global/common/cori/software/python/2.7-anaconda-5.2/lib/python2.7/site-packages/numba/dispatcher.py", line 360, in _compile_for_args
    raise e
numba.errors.LoweringError: Failed at object (object mode backend)
make_function(closure=None, code=<code object <lambda> at 0x2aaaabb0a430, file "min.py", line 8>, name=None, defaults=None)

File "min.py", line 8:
def r(zf):
  return integrate.quad(lambda z: z,1,zf)
  ^
[1] During: lowering "$0.4 = make_function(closure=None, code=<code object <lambda> at 0x2aaaabb0a430, file "min.py", line 8>, name=None, defaults=None)" at min.py (8)
-------------------------------------------------------------------------------
 This should not have happened, a problem has occurred in Numba's internals.

Please report the error message and traceback, along with a minimal reproducer
at: https://github.com/numba/numba/issues/new

If you need help writing a minimal reproducer please see:
http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports

If more help is needed please feel free to speak to the Numba core developers
directly at: https://gitter.im/numba/numba

Thanks in advance for your help in improving Numba!

[stuartarchibald]

NOTE: updated comment for markdown syntax.

Thanks for the report. In general only a subset of NumPy and Python functions/features are supported by Numba, documentation on those supported can be found here.

• NumPy Features
• Python Features

Also, which version of Numba are you using? Locally on 0.44.1 I get:

Numba encountered the use of a language feature it does not support in this context: <lambda> (op code: make_function not supported). If the feature is explicitly supported it is likely that the result of the expression (<lambda>) is being used in an unsupported manner.

RE formatting in GitHub issues, for future reference triple backticks are needed around a code block (with optional language syntax specified), for example: ```python <your code> ```. GitHub also has a basic guide to its markdown syntax available here.

[wkblack]

Thanks for the docs and the formatting pages!

I'm using python 2.7 and numba 0.38.0 apparently. The "dirty" tag worries me, though it's not likely the problem.

Python 2.7.15 |Anaconda, Inc.| (default, Dec 14 2018, 19:04:19)
[GCC 7.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import numba
>>> numba.__version__
'0.38.0+0.g2a2b772fc.dirty'

[stuartarchibald]

Thanks for the docs and the formatting pages!

No problem.

I'm using python 2.7 and numba 0.38.0 apparently. The "dirty" tag worries me, though it's not likely the problem.

Thanks for confirming. You may find you get considerably better help messages if you upgrade, 0.44.1 is the latest released version. This won't fix the problem, that Numba doesn't support SciPy functions, but should help in general when using Numba.

[stuartarchibald]

Closing this issue as it seems to be resolved. If this is not the case please re-open with a comment about any item that appears to be unresolved. Many thanks.