wafrat (Page 6)

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

firestore

How come Firestore won't write anything anymore?

I had been scratching my head since last night. For some reason, when creating lots of new documents, only the first batch would show up in my UI. I'd put a print before and after the await batch.commit() and see that it would hang. What was going on? It

Using Firebase in Flutter on macOS

Firebase Auth Authentication methods I typically use Google Sign In for my projects, but as you can see on https://pub.dev/packages/google_sign_in, it only supports Android, iOS and Web, and there is no GitHub issue tracking Desktop. Phone authentication also required extra steps, and it didn't

tensorflow

TensorFlow reference docs

In a previous post, I collected reference documentation for Python at http://blog.wafrat.com/finding-the-python-reference-docs/. Let's do the same for TensorFlow: * https://www.tensorflow.org/api_docs/python/tf/dtypes/DType * https://keras.io/api/preprocessing/image/ * https://www.tensorflow.org/api_docs/python/tf/keras/Model#fit * https:

flutter