GostInShell

@stnoah1 Thank you for your reply! Could you also kindly explain why the `Precision@N` and `Recall@N` are different under micro- and macro situation? Hope I get this right: `Mirco` directly...

The `Viewer()` class to set camera view in `example.py` may has some error. You can try the examples on [colab](https://colab.research.google.com/drive/1rTLHk0qxh4dn8KNe-mCnN8HAWdd2_BEh#scrollTo=KR22a3AzRP-y). It works fine and can render RGBD images.