Remove slow cdist as scipy is now a hard dependency

ngsPETSc/utils/firedrake/meshes.py

@@ -11,12 +11,7 @@
 
 import numpy as np
 from petsc4py import PETSc
-
-try:
-    from scipy.spatial.distance import cdist
-    HAVE_SCIPY = True
-except ImportError:
-    HAVE_SCIPY = False
+from scipy.spatial.distance import cdist
 
 import netgen
 import netgen.meshing as ngm
@@ -77,18 +72,6 @@ def refineMarkedElements(self, mark):
         raise NotImplementedError("No implementation for dimension other than 2 and 3.")
 
 
-def _slow_cdist(XA, XB):
-    dist = np.zeros([len(XA), len(XB)])
-    for ii, a in enumerate(XA):
-        for jj, b in enumerate(XB):
-            dist[ii, jj] = np.linalg.norm(b - a)
-    return dist
-
-
-if not HAVE_SCIPY:
-    cdist = PETSc.Log.EventDecorator()(_slow_cdist)
-
-
 @PETSc.Log.EventDecorator()
 def find_permutation(points_a, points_b, tol=1e-5):
     """ Find all permutations between a list of two sets of points.