dapp Loan statistics on Aave Aave is a leading decentralized lending/borrowing platform with a huge valuation. See https://defipulse.com/aave. There is also a cool website that provides comprehensive data: https://v2.aavewatch.com/. However I find it hard to parse and I'd like to have a more graphical view of what's happening.
dapp Part 2: Querying dApp GraphQL databases in React and TypeScript hosted on The Graph As we saw in the previous post, it is not ideal to do it in Dart or Flutter. So let's do it in React and TypeScript instead. Create a React project in TypeScript First let's create a React project in TypeScript (see doc): npx create-react-app borrow-stats-react --template typescript Running npm
dapp Part 1: Querying dApp GraphQL databases in Dart hosted on The Graph I wanted to read the GraphQL database in Dart to make analytics for the decentralized platform Aave. It turned out to be harder than I thought! The Graph The Graph is a service that hosts GraphQL databases for dApps. One specificity is that The Graph adds some annotations to GraphQL
flutter Using flutterfire_ui's SignInScreen with unit tests On the blog post describing the release of Flutter 2.8 (see https://medium.com/flutter/whats-new-in-flutter-2-8-d085b763d181), they introduced flutterfire_ui. This library provides standard UI for signing in with Firebase Auth. The post is a bit long cause I ran into a few issues. If you are not interested
flutter Fixing `The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions is 9.0` I usually debug my Flutter apps using the Android Emulator. This time, I used the iOS Simulator. Except it threw this error: note: Using new build system note: Planning note: Build preparation complete note: Building targets in dependency order /my_project/ios/Pods/Pods.xcodeproj: warning: The iOS Simulator deployment
flutter Fixing `Module was compiled with an incompatible version of Kotlin.` Today I upgraded Flutter from version 2.7 to 2.9, and my app compilation started failing with this error: ~/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.5.31/43331609c7de811fed085e0dfd150874b157c32/kotlin-stdlib-common-1.5.31.jar!/META-INF/kotlin-stdlib-common.kotlin_module: Module was compiled with an incompatible version of Kotlin.
flutter Fixing `permissionhandler/PermissionUtils.java:370: error: cannot find symbol if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S && hasPermissionInManifest(context, null, permission )), symbol: variable S, location: class VERSION_CODES` My app suddenly refused to run on my Android Emulator. The error was: Launching lib/main.dart on sdk gphone64 arm64 in debug mode... WARNING: [Processor] Library '~/.gradle/caches/modules-2/files-2.1/com.github.canardoux/flutter_sound_core/8.4.2/d794510c32a335c61b742367e24e84ea0b0995c8/flutter_sound_core-8.4.2.aar' contains
gaming Viewing angle by screen type Last time I wrote about perceived pixel size by screen type. Today I'll write about viewing angle. Viewing angle is the angle that your screen makes to your eyes. For a given screen, as you move closer to it, viewing angle increases. Immersiveness increases as viewing angle increases. But how
gaming What's a retina display? I recently started using an old 1080p TV as my monitor for my gaming PC. Since I sit close to it, the immersion is nice when playing Assassin's Creed. However the pixels are huge! I was wondering if I would still see the pixels if I had a 4K TV
gaming Graphics cards comparison In the past few weeks, I've regained interest in gaming, and I got curious about laptops vs desktop graphics cards. So I made this chart. Methodology Data source Initially, I just googled a few GPU models and ended up using userbenchmark.com. Here's what the page looks like for my
gaming Gaming: desktop, laptop, consoles or streaming? In this post I'll compare 4 ways to play video games: desktop PC, laptop, consoles and streaming. My goal is to play Assassin's Creed Valhalla, Age of Empires 4 and Diablo 4 when they come out. Streaming The two main players in that area are Google Stadia and Amazon Luna.
gaming My gaming PC over time In this post I'll describe the desktop PC that I have assembled and used for gaming since 2012. Initial build in 2012 In April 2012, I assembled a PC primarily to play Diablo 3, which came out in May 2012. It had: * a Core i5-2500K processor * an NVIDIA GeForce GTX
flutter Fixing `xcrun: error: unable to find utility "xcodebuild", not a developer tool or in PATH` Today I tried to run a Desktop (macOS) Flutter app that used to run perfectly. This time, instead of launching, it threw this error: Launching lib/main.dart on macOS in debug mode... lib/main.dart:1ProcessException: Process exited abnormally: xcrun: error: unable to find utility "xcodebuild", not a developer
tensorflow Using TensorFlow addons on Mac with M1 These days I am building an image classifier using an unbalanced dataset. So instead of Accuracy, I am more interested in viewing Precision and Recall, or the F1 score. The F1 score metric is implemented by https://www.tensorflow.org/addons/api_docs/python/tfa/metrics/F1Score. So I went
tensorflow Using the Keras Tuner Recently I read about the Keras Tuner. A hyperparameter tuner in machine learning is a piece of software that will train random combinations of models in order to find the best architecture. See https://www.tensorflow.org/tutorials/keras/keras_tuner. The idea is simple: 1. make a function that
m1 Homebrew on Mac with M1 Recently I needed to install graphviz. On their official site, they say one way is to use Homebrew. Workaround: use Rosetta 2 Here's what I got: % brew install graphviz Error: Cannot install in Homebrew on ARM processor in Intel default prefix (/usr/local)! Please create a new installation in /opt/
m1 Installing scikit-learn, panda, scipy, numpy on a Mac with M1 Before installing scikit-learn, you should install its dependencies. Installing Pandas Pandas installs fine with pip install pandas. However, when I tried to import it in my Jupyter Lab notebook, it crashed with this error: ValueError Traceback (most recent call last) in ----> 1 import pandas as pd ~/miniforge3/envs/tf25/
machine learning Survey of Keras's image related generators In François Chollet's Deep learning with Python, he teaches how to build image classification models using ImageDataGenerators. Let's look into how these are made and how to use them. tf.keras.preprocessing.image.ImageDataGeneratorGenerate batches of tensor image data with real-time data augmentation.TensorFlow Basic usage Use images in a
tensorflow Plotting discrimination thresholds in TensorFlow scikit-learn can render precision, recall and F1 score depending on thresholds in a chart. I wanted the same to evaluate my binary classifier made with TensorFlow. See how it looks like on scikit-learn. O(data × number of thresholds) Generating thresholds In order to implement it, I had to figure out
tensorflow Installing TensorFlow 2.5 and Jupyter Lab on Mac with M1 Last month, I finally painstakingly installed TensorFlow 2.4 and Jupyter Lab on my Mac with M1 (see the blog post). It worked nicely: 10 times faster than Colab, but also had a few issues like working only with Python 3.8, having to manually downgrade some packages such as
python How to compute things in parallel in Python I had a loop that could be parallelized and wanted to take advantage of my CPU cores. A quick search led me to https://docs.python.org/3/library/asyncio-task.html#running-tasks-concurrently. It looked simple enough: define your methods as async, then run them with a gather. However, I realized
numpy Fixing `TypeError: only integer scalar arrays can be converted to a scalar index` This will be a short post. I was trying to concatenate two numpy arrays, when I got this exception: TypeError: only integer scalar arrays can be converted to a scalar index I was following https://numpy.org/doc/stable/reference/generated/numpy.concatenate.html. It turned out I misread the
machine learning Displaying a confusion matrix in TensorFlow I recently started dabbling in TensorFlow by training an image classifier. My classifier has a few classes, and instead of blindly judging its accuracy, I decided to look at the confusion matrix to see which classes it recognized well and which it didn't. Multiclass classifier In TensorFlow, there's a function
flutter Profiling a Flutter app Today I ran into some performance issue when I used my image gallery app on a folder of 17k images. Lots of jank. So I decided to use the Flutter profiler for the first time. I started from the Flutter performance profiling page. Flutter performance profilingDiagnosing UI performance issues in
flutter Fixing `Unable to load asset: FontManifest.json` when using golden_toolkit I recently started using eBay's golden_toolkit for screenshot tests instead of Flutter's built-in matchesGoldenFile. My main issue with the built-in function was that it would use the Ahem font, which is all blocks. It makes it much harder to see if your app rendered correctly. In the past, I
