Battle of Algiers

Incredible film about the political conflict in Algeria:

https://www.vrbo.com/1916821?adultsCount=4&arrival=2021-12-24&departure=2021-12-31&unitId=2479340

How to make Preview the Default Application for Opening PDFs instead of Adobe (MacOS)

Ever since I downloaded Adobe Acrobat Reader, I noticed that all my PDFs open with Adobe, which I did not prefer as I liked the Preview interface.

In order to make preview the default app for opening pdf files, you can right click a PDF file in Finder/Desktop, and then press Get Info. Then, it will show some details. Open the drop down that says Open With: and set it to Preview. Then, press Change All. Now, whenever you open a PDF, it will always open in Preview.

Two’s Complement

Explanation of two’s complement: https://www.cs.cornell.edu/~tomf/notes/cps104/twoscomp.html

Idea:

Take binary digits, flip them all, then add 1

To undo two’s complement: -1 from binary digit, flip all digits, convert

KMeans Clustering

Since I’m currently doing KMeans Clustering for my AI class, here are some resources I found helpful:

sklearn.cluster.KMeans:

https://scikit-learn.org/stable/modules/generated/sklearn.cluster.KMeans.html

Example code of kMeans segmentation: 

Segmentation using k-means clustering in Python

Image Segmentation using KMeans:

Open CV Tutorial: https://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_ml/py_kmeans/py_kmeans_opencv/py_kmeans_opencv.html

Open CV Full Tutorial with Python: 

 

K-fold Cross Validation

I had some confusions in my AI class regarding how k-fold cross validation worked, and I found this very concise and clear explanation for it:

 

How to rename an iOS project in XCode

Renaming a project in XCode can be a hassle and cause a lot of complications and problems if not done correctly because there are a lot of root files and embedded files that must be renamed as well. So how can you easily rename a project in XCode?

The following tutorial shows you how to do it within 3 minutes and I found it very helpful:  https://www.youtube.com/watch?v=6P6ya2vdC8M&ab_channel=CodeDisciple

The only discrepancy I found in that tutorial (made in 2019) and Xcode version today (2021) is that I don’t believe the current version has an option to rename the “Development Assets” under Deployment, but everything else is the same.

Best of luck!

Constraint Satisfaction Problems (CSP)

Constraint Satisfaction Problem

Characteristics:

    • Search problem
    • Care about the goal itself: state is a black blox, implemented as some data structure
    • Goal test: function over the states, set of constraints specifying allowable combinations of values for subset of variables
    • Main 3 elements of CSP:
  1. Set of variables
  2. Set of domains for each variable
  3. Set of constraints