RuntimeError: Could not load any ArrayFire libraries.

Hi, I am using MACOS, I have 1. Download and install binaries 2. pip install arrayfire 3. export DYLD_LIBRARY_PATH=/opt/arrayfire/lib:$DYLD_LIBRARY_PATH

It can be used with command line

But when I use the same conda environment and `python VeM.py` which is a script containing import arrayfire, it shows
```
Traceback (most recent call last):
File "/Users/zetao/Documents/code/edu/python_code/first_try/VEM_deblur.py", line 3, in
import arrayfire as af
File "/Users/zetao/opt/anaconda3/lib/python3.7/site-packages/arrayfire/__init__.py", line 56, in
from .library import *
File "/Users/zetao/opt/anaconda3/lib/python3.7/site-packages/arrayfire/library.py", line 643, in
backend = _clibrary()
File "/Users/zetao/opt/anaconda3/lib/python3.7/site-packages/arrayfire/library.py", line 619, in __init__
raise RuntimeError("Could not load any ArrayFire libraries.\n" + more_info_str)
RuntimeError: Could not load any ArrayFire libraries.
```
Can anyone kindly explain why?

Reproduce the import in the reported conda environment using the macOS commands, then inspect arrayfire/__init__.py and arrayfire/library.py, especially the _clibrary() path that raises the error. Compare the command-line and Python environments; done means identifying a reproducible cause and documenting or testing a fix for loading the ArrayFire libraries.

Written by the indexing model from the issue text.