pytorch3d compatibility

Summary: Making meshrcnn compatible with new PyTorch3D features/API changes.

Reviewed By: nikhilaravi

Differential Revision: D21149516

fbshipit-source-id: 1c7b8c1c1f5a2abe7d379fee10ded5d2db21515a

pytorch3d/ops/knn.py

@@ -145,6 +145,9 @@ def knn_points(
     if p1.shape[2] != p2.shape[2]:
         raise ValueError("pts1 and pts2 must have the same point dimension.")
 
+    p1 = p1.contiguous()
+    p2 = p2.contiguous()
+
     P1 = p1.shape[1]
     P2 = p2.shape[1]