Add option to PortMapper classes to control copying of data array pas…

…sed to constructors.

neurokernel/plsel.py

@@ -2058,6 +2058,9 @@ class PortMapper(BasePortMapper):
         Integer indices to map to port identifiers. If no map is specified,
         it is assumed to be an array of consecutive integers from 0
         through one less than the number of ports.
+    make_copy : bool
+        If True, map a copy of the specified data array to the specified 
+        port identifiers.
 
     Attributes
     ----------
@@ -2075,7 +2078,7 @@ class PortMapper(BasePortMapper):
     The selectors may not contain any '*' or '[:]' characters.
     """
 
-    def __init__(self, selector, data=None, portmap=None):
+    def __init__(self, selector, data=None, portmap=None, make_copy=True):
         super(PortMapper, self).__init__(selector, portmap)
         N = len(self)
 
@@ -2092,7 +2095,10 @@ def __init__(self, selector, data=None, portmap=None):
 
             # The port mapper may map identifiers to some portion of the data array:
             assert N <= len(data)
-            self.data = data.copy()
+            if make_copy:
+                self.data = data.copy()
+            else:
+                self.data = data
 
     def copy(self):
         """

neurokernel/pm_gpu.py

@@ -10,7 +10,7 @@
 from plsel import BasePortMapper
 
 class GPUPortMapper(PortMapper):
-    def __init__(self, selector, data=None, portmap=None):
+    def __init__(self, selector, data=None, portmap=None, make_copy=True):
         super(PortMapper, self).__init__(selector, portmap)
         N = len(self)
 
@@ -26,7 +26,10 @@ def __init__(self, selector, data=None, portmap=None):
 
             # The port mapper may map identifiers to some portion of the data array:
             assert N <= len(data)
-            self.data = data.copy()
+            if make_copy:
+                self.data = data.copy()
+            else:
+                self.data = data
 
     def get_inds_nonzero(self):
         raise NotImplementedError

tests/test_plsel.py

@@ -752,6 +752,12 @@ def test_copy(self):
         assert_array_equal(pm2.data, pm1.data)
         assert_series_equal(pm2.portmap, pm1.portmap)
 
+        data = np.random.rand(5)
+        pm0 = PortMapper('/foo[0:5]', data, portmap, False)
+        pm1 = pm0.copy()
+        data[0] = 1.0
+        assert pm0.data[0] == 1.0
+
     def test_dtype(self):
         pm = PortMapper('/foo/bar[0:10],/foo/baz[0:10]', self.data)
         assert pm.dtype == np.float64