conflict with matplotlib.pyplot

Reproduziere das bereitgestellte Python-3.6-Beispiel mit matplotlib.pyplot, ArrayFire, der arithmetischen Operation und data.join. Untersuche arrayfire/data.py bei join, arrayfire/util.py bei safe_call und den gemeldeten Pfad src/backend/cuda/jit.cpp, um festzustellen, warum eine Änderung der Importreihenfolge den JIT-Fehler verändert; abgeschlossen ist die Aufgabe, wenn der Reproducer nicht mehr fehlschlägt, ohne dass eine Anpassung der Importreihenfolge erforderlich ist.

These codes will trigger an error in just in time compiler

import matplotlib; matplotlib.use('Agg')
import matplotlib.pyplot as plt
import arrayfire as af

a = af.data.range( 640, 1280, dim=0 )
b = af.data.range( 640, 1280, dim=0 ) - 1

af.data.join(0,a,b,)

and the error output is

Traceback (most recent call last):
  File "test.py", line 8, in <module>
    af.data.join(0,a,b,)
  File "/home/herbert/anaconda3/lib/python3.6/site-packages/arrayfire/data.py", line 320, in join
    safe_call(backend.get().af_join(c_pointer(out.arr), dim, first.arr, second.arr))
  File "/home/herbert/anaconda3/lib/python3.6/site-packages/arrayfire/util.py", line 79, in safe_call
    raise RuntimeError(to_str(err_str))
RuntimeError: In function std::vector<char> cuda::compileToPTX(const char*, std::string)
In file src/backend/cuda/jit.cpp:

However, without any major change, the following two will not,

# change the import order between pyplot and arrayfire

import matplotlib; matplotlib.use('Agg')
import arrayfire as af
import matplotlib.pyplot as plt

a = af.data.range( 640, 1280, dim=0 )
b = af.data.range( 640, 1280, dim=0 ) - 1

af.data.join(0,a,b,)

or

# do not perform the arithmetic operation on one of the array  

import matplotlib; matplotlib.use('Agg')
import matplotlib.pyplot as plt
import arrayfire as af

a = af.data.range( 640, 1280, dim=0 )
b = af.data.range( 640, 1280, dim=0 )

af.data.join(0,a,b,)

Here is my python environment obtained by running python in a terminal.

Python 3.6.8 |Anaconda, Inc.| (default, Dec 30 2018, 01:22:34) 
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.