ModuleNotFoundError: No module named 'mmcv._ext'

If you are getting this error when trying to run the latest version of mmdet with the latest version of mmcv (installed via pip), this solves the problem 
pip uninstall mmcv mmcv-full
git clone
cd mmcv
MMCV_WITH_OPS=1 pip install -e .

Labels: machine_learning , pytorch

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How to Mount a Volume to an EC2 Instance

Oct. 11, 2020, 11:28 a.m.

So that I can remember next time I need to do it :

  1. Attach the volume to the instance
  2. From the instance:
    1. lsblk
    2. mkdir /whatever
    3. mount /dev/xvdf /whatever/

Labels: ec2

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Git Through Proxy Server

May 11, 2020, 7:53 a.m.

As of a few days ago they must have changed something in the corporate proxy server at work because all of a sudden no one could push or pull to git remotes. I was getting error "fatal: unable to access [proxy server address]: Timed out"

After much frustration, it turns out there was a fairly simple solution. I had http_proxy and https_proxy environment variables set to the proxy server. If I set an environment variable "no_proxy" with the values of the domains I need to connect to with git everything works fine.

Labels: git


Javascript and React

Feb. 15, 2020, 8:06 a.m.

In university I was a TA for what they called "third stream computing," which was basically simple computer programming for non-CS people. We covered things like Hypercard, HTML and Javascript, which at the time was limited to things like showing alerts and validating and submitting forms. I think that the idea of Javascript as a very simple and not very powerful language has stuck with me through the years, even while Javascript has been maturing and advancing enormously.

A few weeks ago I decided one morning to spend an hour going through a ReactJS tutorial, because I keep hearing so much about it. After about half an hour I stopped the tutorial and starting rewriting something I was working on in React. Since then I've been doing any web-related work in React and re-writing other web stuff I've previously done in React.

Javascript frameworks like React are going to completely change web development, instead of the back-end serving HTML the back-end will now serve JSON through APIs and the front-ends will probably mostly be Javascript. And in my opinion that's a much better and more efficient way to create interactive websites. Not only is it faster to load and render data on the front-end, but it's much cleaner in terms of code and separating functionality. 

Labels: javascript , react