Communications of the ACM
Refine your search:
How the “Frontier” Became the Slogan of Uncontrolled AI
Artificial intelligence (AI) has been billed as the next frontier of humanity: the newly available expanse whose exploration …
From Daniel Lemire's Blog
What I do with my time
I am not a very productive person. I also do not work long hours. However, I sometimes give the impression that I productive. I have been asked to explain how I...
From Daniel Lemire's Blog
The learning pill
Shirky predicts that the bulk of higher education is being disrupted the same way the music industry was disrupted by MP3 files. Should we believe him? Let us run...
From Daniel Lemire's Blog
Fast Sets of Integers
Maintaining a set of integers is a common problem in programming. It can also be implemented in many different ways. Maybe the most common implementation uses a...
From Daniel Lemire's Blog
Should you follow the experts?
It is silly to say that ignorance is strength. However, the contrary statement is not follow the experts. The right knowledge is strength. The tricky part is that...
From Daniel Lemire's Blog
Is reading memory faster than writing on a PC?
For human beings, reading is much faster than writing. The same is often true for computers: adding a record to a database may take an order of magnitude longer...
From Daniel Lemire's Blog
When is a bitmap faster than an integer list?
You can represent a list of distinct integers no larger than N using exactly N bits: if the integer i appears in your list, you set the i th bit to true. Bits for...
From Daniel Lemire's Blog
You cannot scale creativity
As a teenager, I was genuinely impressed by communism. The way I saw it, the West could never compete. The USSR offered a centralized and efficient system that...
From Daniel Lemire's Blog
Will I get a job with this degree?
In Quebec, we have had massive student protests. Students were asking for free higher education. It seems that things have quieted down as the new government has...
From Daniel Lemire's Blog
How well does peer review work?
Since the second world war, science has relied on what I call traditional peer review. In this form of peer review, researchers send their manuscript to journal...
From Daniel Lemire's Blog
How to be happier while annoying your wife
About a year ago, I read Made by Hand: Searching for Meaning in a Throwaway World by Mark Frauenfelder. It is a simple book with a simple message. How to be happy...
From Daniel Lemire's Blog
Fast integer compression: decoding billions of integers per second
Databases and search engines often store arrays of integers. In search engines, we have inverted indexes that map a query term to a list of document identifiers...
From Daniel Lemire's Blog
Will tablets kill PCs?
I have always been a fan of the personal computer. I worked all summer once to buy myself a cloned PC XT. I probably would not be a computer science researcher...
From Daniel Lemire's Blog
Organizations would not pass the Turing test
In Computer Science, we often informally judge intelligence by using the Turing test. The Turing test is quite simple: if you can convince an observer that you...
From Daniel Lemire's Blog
Your programming language does not know about elementary mathematics
In Mathematics, we typically require equality to form equivalence classes. That is, it should be reflexive: A should be equal to A. Moreover, it should be symmetric...
From Daniel Lemire's Blog
To improve your intellectual productivity
We would all like to be smarter, to produce better software, better research papers or better art. It is not difficult to see that, by just about any metric, productivity...
From Daniel Lemire's Blog
Does time fix all?
As an graduate, finding useful references was painful. What the librarians had come up with were terrible time-consuming systems. It took an outsider (Berners-Lee)...
From Daniel Lemire's Blog
On Feeding Your CPU With Data
Can you guess the speed difference between these two lines of code? The first line of code does N additions: for (int i=0; i<N;i++) sum+=arr[i]; The second line...
From Daniel Lemire's Blog
A post-industrial point of view
We can roughly sketch human history as follows: Initially, everything was expensive for human beings. Farming made food cheap. The industrial revolution made goods...
From Daniel Lemire's Blog
The Internet is a product of the post-industrial age
The Internet is on fire with this question: who invented the Internet? A couple of weeks ago, the president of the USA said: Government research created the Internet...
From Daniel Lemire's Blog