work around bug in os x numpy

Author: nir

jupylet/__init__.py

@@ -29,7 +29,7 @@
 import sys
 import os
 
-from .env import is_remote, has_display
+from .env import is_remote, has_display, is_numpy_openblas
 
 
 VERSION = '0.8.3'
@@ -44,6 +44,14 @@
 # mutlithreaded app.
 #
 if platform.system() == 'Darwin':
+   if 'numpy' in sys.modules and is_numpy_openblas():
+      sys.stderr.write(
+         'WARNING: numpy was imported before jupylet. ' + 
+         'On Mac OS X you should import jupylet first to let it work around ' +
+         'a bug in the algebra libraries used by numpy, that may cause the ' +
+         'program to exit.' + '\n'
+      )
+
    os.environ['OPENBLAS_NUM_THREADS'] = '1'
 
 

jupylet/env.py

@@ -103,6 +103,15 @@ def is_binder_env():
     return 'BINDER_REQUEST' in os.environ
 
 
+def is_numpy_openblas():
+    import numpy
+    ll = numpy.__config__.get_info('blas_opt_info')['libraries']
+    for l in ll:
+        if 'openblas' in l:
+            return True
+    return False
+
+
 def is_osx():
     return platform.system().lower() == 'darwin'