fix: set default number of threads for ITK programs to 1

Author: satra

nipype/interfaces/ants/base.py

@@ -15,7 +15,7 @@
 #  the computer (when running MultiProc) by forcing everything to
 #  single threaded.  This can be a severe penalty for registration
 #  performance.
-LOCAL_DEFAULT_NUMBER_OF_THREADS=-1
+LOCAL_DEFAULT_NUMBER_OF_THREADS=1
 # -Using NSLOTS has the same behavior as ITK_GLOBAL_DEFAULT_NUMBER_OF_THREADS
 #  as long as ITK_GLOBAL_DEFAULT_NUMBER_OF_THREADS is not set.  Otherwise
 #  ITK_GLOBAL_DEFAULT_NUMBER_OF_THREADS takes precidence.
@@ -28,8 +28,8 @@ class ANTSCommandInputSpec(CommandLineInputSpec):
     """Base Input Specification for all ANTS Commands
     """
 
-    num_threads = traits.Int(LOCAL_DEFAULT_NUMBER_OF_THREADS, usedefault=True, nohash=True,
-                             desc="Number of ITK threads to use")
+    num_threads = traits.Int(LOCAL_DEFAULT_NUMBER_OF_THREADS, usedefault=True,
+                             nohash=True, desc="Number of ITK threads to use")
 
 
 class ANTSCommand(CommandLine):