ENH: Add random seed option to ANTs registration

Author: ghisvail

nipype/interfaces/ants/registration.py

@@ -585,7 +585,10 @@ class RegistrationInputSpec(ANTSCommandInputSpec):
         usedefault=True,
         desc="The Lower quantile to clip image ranges",
     )
-
+    random_seed = trait.Int(
+        argstr="--random-seed %d",
+        desc="Fixed seed for random number generation",
+    )
     verbose = traits.Bool(
         argstr="-v", default_value=False, usedefault=True, nohash=True
     )
@@ -1708,6 +1711,10 @@ class RegistrationSynQuickInputSpec(ANTSCommandInputSpec):
         desc="precision type (default = double)",
         usedefault=True,
     )
+    random_seed = traits.Int(
+        argstr="-e %d",
+        desc="fixed random seed",
+    )
 
 
 class RegistrationSynQuickOutputSpec(TraitedSpec):