update basic framework

modules/view_finder/abstract_view_finder.py

@@ -0,0 +1,12 @@
+from abc import abstractmethod
+
+from torch import nn
+
+
+class ViewFinder(nn.Module):
+    def __init__(self):
+        super(ViewFinder, self).__init__()
+
+    @abstractmethod
+    def next_best_view(self, scene_pts_feat, target_pts_feat):
+        pass