I am trying to install python-opencv for this code. <https://github.com/rbgirshick/fast-rcnn>

How do I do that? When I type pip install --user python-opencv i get

```
Could not find any downloads that satisfy the requirement python-opencv
Cleaning up...
No distributions at all found for python-opencv

```

I managed to install cython and easydict using 

```
pip install --user cython
pip install --user easydict

```