In the afternoon I noticed that the Psalmopoeus irminia sling I keep
had molted; I saw the exoskeleton on top of a piece of moss coming
out of the cork tube it lives in.
I hadn't seen the spider for weeks, and at times I was worried it had
passed away. However, 4 days ago I removed some moss from it's cork
tube and I saw legs that moved. And today it had kicked out it's
A Gentle Introduction to the Rectified Linear Unit (ReLU)
In a neural network, the activation function is responsible for
transforming the summed weighted input from the node into the
activation of the node or output for that input.
The rectified linear activation function is a piecewise linear
function that will output the input directly if it is positive,
otherwise, it will output zero. It has become the default activation
function for many types of neural networks because a model that uses
it is easier to train and often achieves better performance.
In this tutorial, you will discover the rectified linear activation
function for deep learning neural networks.
My Guide for Rubber Duck Debugging: A Better Process
Would you believe it if I told you that something called "rubber
ducking" is actually one of the most insightful debugging techniques
ever suggested? When you run into a programming snag you can't
figure out, just find a rubber duck and start talking to it about
your problems. Sold, right? Me neither.
I actually love rubber duck debugging, but not in the way it's
usually explained. Turns out, it's hard for adults to take seriously
the idea of talking to a literal rubber duck on their desk. And even
if you guessed the duck is not really the point, you'd be surprised
by how many engineers miss the point entirely. In this article, I'm
going to explain what rubber ducking is, why it does actually work,
and provide a step-by-step process for the way I do it that I think
can change your debugging chops for good.
Saving a Third of Our Memory by Re-ordering Go Struct Fields
In past projects at Qvault we had an
application that typically ran with ~2GB in memory at any given
time. By simply changing the order of some uint variables we managed
to drop the memory usage to less than 1.4GB. The vast majority
of this allocated memory is due to an enormous slice of stats
Pysa is a security-focused tool built on top of our type checker for
Python, Pyre. It’s used
to look at code and analyze how data flows through it. Analyzing
data flows is useful because many security and privacy issues can be
modeled as data flowing into a place it shouldn’t.
I've been wanting to write a big project in
Rust for a while as a learning
exercise, and actually started one in late 2018 (a FUSE server
implementation). But then life happened and I got busy and never
went anywhere with it. Due to certain world circumstances I'm
currently spending a lot of time indoors so
now exists and is good enough to write basic hello-world
filesystems. I plan to polish it up a bit more with the goal of
releasing a v1.0 that supports the same use cases as
I took some notes along the way about things that struck me as
especially good or bad. Overall I quite like Rust the language, have
mixed feelings about the quality of ancillary tooling, and have
strong objections to some decisions made by the packaging system
(Cargo + crates.io).
For 500 days I have been blogging on Plurrrr non-stop, one post a
day. Thank you for reading and following!
tutorial: recipes and examples for everyday situations (or that’s
the goal 😉). We cover all the necessary methods like then,
catch, and finally. Also, we go over more complex situations
like executing promises in parallel with Promise.all, timing out
APIs with Promise.race, promise chaining and some best practices
Debugging Python server memory leaks with the Fil profiler
Your server is running just fine, handling requests and sending
responses. But then, ever so slowly, memory usage creeps up, and up,
and up–until eventually your process runs out of memory and
crashes. And then it restarts, and the leaking starts all over
In order to fix memory leaks, you need to figure out where that
memory is being allocated. And that can be tricky, unless you use
the right tools.
Let’s see how you can identify the exact lines of code that are
leaking by using the Fil memory profiler.
The new CSS property that boosts your rendering performance
property, launching in Chromium 85, might be one of the most
impactful new CSS properties for improving page load
performance. content-visibility enables the user agent to skip an
element's rendering work, including layout and painting, until it is
needed. Because rendering is skipped, if a large portion of your
content is off-screen, leveraging the content-visibility property
makes the initial user load much faster. It also allows for faster
interactions with the on-screen content. Pretty neat.
The main idea of functional programming is to treat functions like
any other data types. In particular, we want to be able to pass
functions as arguments to other functions, return them as values,
and store them in data structures. But what kind of data type is a
This 9,000 word blog post is a complete introduction to Bayes
Theorem and how to put it to practice. In short, Bayes Theorem is a
framework for critical thinking. By the end of this post, you’ll be
making better decisions, realise when you’re being unreasonable, and
also understand why some people believe in UFOs.
Python .whl files, or
wheels, are a
little-discussed part of Python, but they’ve been a boon to the
installation process for Python packages. If you’ve installed a
Python package using pip,
then chances are that a wheel has made the installation faster and
Wheels are a component of the Python ecosystem that helps to make
package installs just work. They allow for faster installations and
more stability in the package distribution process. In this
tutorial, you’ll dive into what wheels are, what good they serve,
and how they’ve gained traction and made Python even more of a joy
to work with.
Reading type signatures will become the part of basic computer
literacy curriculum taught in elementary schools.
While they taught you how Microsoft spreadsheets operated kids in
future will learn some lambda calculus instead.
Types will be the standard user interfacing element to access
computer systems. It will replace the buttons and text boxes of the
present day and ordinary people will use them every day.
This article tells what these "types" are and gives a taste of how
to read type signatures. Then I explain why I think this is useful
and conclude with an example of reading code with types. I assume
that you understand a bit of basic algebra.
We present the earliest evidence for domestic cat (Felis catus L.,
1758) from Kazakhstan, found as a well preserved skeleton with
extensive osteological pathologies dating to 775–940 cal CE from the
early medieval city of Dzhankent, Kazakhstan. This urban settlement
was located on the intersection of the northern Silk Road route
which linked the cities of Khorezm in the south to the trading
settlements in the Volga region to the north and was known in the
tenth century CE as the capital of the nomad Oghuz. The presence of
this domestic cat, presented here as an osteobiography using a
combination of zooarchaeological, genetic, and isotopic data,
provides proxy evidence for a fundamental shift in the nature of
human-animal relationships within a previously pastoral region. This
illustrates the broader social, cultural, and economic changes
occurring within the context of rapid urbanisation during the early
medieval period along the Silk Road.
Source: The earliest domestic cat on the Silk
Road, an article
by A. F. Haruda, A. R. Ventresca Miller, J. L. A. Paijmans, A. Barlow,
A. Tazhekeyev, S. Bilalov, Y. Hesse, M. Preick, T. King, R. Thomas,
H. Härke & I. Arzhantseva
A Technical Introduction to Reinforcement Learning
Reinforcement learning is a paradigm where agents learn through
interaction with their environment.