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Setting up a self-hosted Ghost blog in 2021

A lot has changed since I set up this blog back in 2017. Now, DigitalOcean has created a way to get started much faster and with less hassle. See how I did it manually back then at http://blog.wafrat.com/setting-up-the-blog/. This blog

tensorflow

Use TensorBoard in Colab to track the training of a text classification model

I just read Chapter 7 of Chollet's Deep learning with Python, and it introduces TensorBoard as a way to visualize metrics in real-time during training and embeddings. The goalIn order to try it out, I decided to make a text classification model that predicts

flutter web

Fixing `Caught error: Unsupported operation: Platform._version` when using HttpClient in Flutter Web

While porting my Flutter mobile app to Web, I ran into this exception: Caught error: Unsupported operation: Platform._versionIt originated from dart-sdk/lib/_http/http.dart, more precisely as soon as I instantiate dart io's HttpClient. Starting from dart io's HttpClientAfter reading a few

linux

Resizing swap

I use small Digital Ocean virtual machines, and they come with little RAM and little drive space. I originally allocated 4 GB for the swap, but now I want to reduce it to 2 GB. Initially to prevent the server from going out of

flutter web

Fixing `Caught error: Unsupported operation: Platform._operatingSystem`

I recently added Web support to an existing mobile Flutter app and got this error when running it in Chrome: Caught error: Unsupported operation: Platform._operatingSystemIt turns out it is a known issue in Flutter Web, from July 2019: https://github.com/flutter/flutter/

firebase

Firebase in Flutter Web

Firebase recently added Flutter Web support for Firestore, Firebase Auth and Firestore Storage. Here's how I set up a pre-existing Flutter + Firestore mobile app to run on Web. Set up the Web projectFirst I ran flutter create . as instructed at https://flutter.dev/docs/

machine learning

Fixing `RuntimeError: tf.gradients is not supported when eager execution is enabled. Use tf.GradientTape instead.`

I was following a code sample to visualize convnet filters from Chollet's book. And because of TensorFlow 2's API change, the original code breaks telling us to use tf.Gradient. Note that this is a work in progress. I have not managed to fix

Fixing "Invalid `Podfile` file: no implicit conversion of nil into String."

I tried running integration tests on a my project, and I got this cryptic error: % flutter drive --target=test_driver/cloud_firestore_behaviors.dart Running "flutter pub get" in cloud_firestore_mocks... 1,005ms Running pod install... 653ms CocoaPods' output: ↳ [!] Invalid `Podfile`

machine learning

Installing TensorFlow and JupyterLab on Mac with M1

A few weeks ago (see Getting started with ML: Colab or self-hosted Jupyter?), I said I would eventually install JupyterLab locally on my Mac with M1. TRLDThe date is Feb 25, 2021. I found out the hard way that since scipy won't work for

Handling customer requests as a developer

Whether you're receiving requests from your product manager in a large company, or from your client as a freelancer, the process is the same. Everything is "critical"!You're rushing to complete all the features for an upcoming launch, and your client comes with new

machine learning

Using Kaggle datasets in Colab

Here's how I got Kaggle datasets into Colab. The book I'm following referred to the Dogs vs Cats dataset. After creating an account, I went to the dataset page. Dogs vs. Cats | KaggleCreate an algorithm to distinguish dogs from catsKaggleOne way would be to

python

Finding the Python reference docs

Since I'm a total Python beginner, I frequently need to read about its common built-in functions and idioms. Docshttps://docs.python.org/3/. Check out the Tutorial and Library Reference.Built-in functions: https://docs.python.org/3/library/functions.htmlhttps://docs.python.org/3/

machine learning

Getting started with ML: Colab or self-hosted Jupyter?

The basic trade off is well-known. If you use an online VM like Google's Colab or Amazon's EC2 instances, you don't need hardware, but the cost of running the VMs will get expensive later. If you self-host, you need to buy some dedicated hardware,

Software development best practices

This post is a list of best practices that will help junior developers become productive quickly. StyleNames are incredibly importantWell-named functions and variables will save you time because they make your code more readable. In turn you will produce fewer bugs. Well-written code reads

Work around Fatal error `Check failed: allocator->SetPermissions`

This morning I tried to run a web project, and it failed with this error: Fatal error in , line 0 Check failed: allocator->SetPermissions(reinterpret_cast<void*>(region.begin()), region.size(), PageAllocator::kNoAccess). FailureMessage Object: 0x16cf24268 1: 0x102fd6218 node::NodePlatform::GetStackTracePrinter(

flutter

Fixing Specs satisfying the `sqflite (from `.symlinks/plugins/sqflite/ios`)` dependency were found, but they required a higher minimum deployment target

I tried compiling my app on a new environment, and it failed when installing iOS pods with this error: Specs satisfying the sqflite (from .symlinks/plugins/sqflite/ios) dependency were found, but they required a higher minimum deployment target.Longer logs: % flutter build ios

unity

Publishing an asset on the Unity Asset Store

My goal is to make reusable components that I would reuse throughout most of my games. Sign up as a PublisherI went to the Publisher sign up page, and filled out the required info. As usual, I used the tools at http://blog.wafrat.

unity

Simulating touch events in Play mode in Unity

This should have been easy, but it really wasn't. I wish the information was more prominently displayed in the Unity docs and tutorials. How to do itGo to Window, Analysis, Input Debug.In the Options dropdown, check Simulate Touch Input From Mouse or Pen.

unity

Publishing a game made in Unity to the Play Store

There is a tutorial on how to publish a game made in Unity to the Play Store on Unity Learn. Here's how it went. Publishing for Android - Unity LearnUnity includes a built-in publishing feature that allows you to publish to various popular platforms

unity

Making the UI resolution dependent in Unity

The UI on my phone was tiny compared to when I ran it on my computer. Also even though I haven't tried on other devices, I figured results might differ widely depending on their resolutions. It's actually possible to make resolution independent UI. As

unity

Migrating TMPro to Unity's new Input System

After installing Unity's new EventSystem, my UI broke. It turns out I had to click the "Replace with InputSystemUIInputModule" in each scene's EventSystem. EventSystem using the older input systemBut I realized that only after deleting the EventSystems. The new Input System comes with samplesEventSystem

unity

Fixing adb server version (41) doesn't match this client (40); in Unity

Earlier Unity suddenly started to refuse building and running on my Android phone. The error message was this: * failed to start daemon error: cannot connect to daemon UnityEditor.Android.CommandInvokationFailure: Unable to list connected devices. /Applications/Unity/Hub/Editor/2019.4.18f1/PlaybackEngines/AndroidPlayer/

unity

Unit Testing in Unity

I am developing a mobile game in Unity, and it was getting really hard to test it manually. So here's how I introduced unit tests to speed up development. Developing for Desktop vs MobileOn desktop, you can get away without unit tests because of

unity

Version Control in Unity

There are several ways to do version control in Unity. What works for me is the regular git command line. Here's my workflow. Available optionsThere is a full "mission" on Unity Learn on how to do it. Version Control and Optimization - Unity LearnWelcome

unity

Architecture of an FPS in Unity

The FPS Microgame is a FPS template for learning Unity. In this post, I'll explore the project to understand how things are made. This will help me make my own games later. This is a work in progress. FPS Microgame - Unity LearnThe FPS