Playgrounds | Some playgrounds to play | REST library

I'm trying to train a CoreML sound classifier on device, on iOS, and I have been struggling to find learning resources on the topic. The sound classifier is used to determine whether a snippet of music is similar to a collection of other songs. Hence the output of the classifier is just a label of either "match" / "no match".

It is so simple to train with the CreateML app workflow. I am simply trying to get the same kind of training on device in iOS, but as far as I know (please correct me if I'm wrong) iOS doesn't support createML.

I have been trying to adapt code from various source to get this to work in an iOS playground. I can only find resources on training image classifiers, these two have been the most helpful (1, 2).

Please see the code that I have come up with so far below.

The above code works on a Mac, using the Xcode editor. However, the same code returns: abort() called on an iPad using Swift Playground's editor. How do I render Text() on the iPad?

I followed the directions in this video:

https://developer.apple.com/videos/play/wwdc2020/10643/

I found a similar question in Apple's developer forums, but no real solution:

https://developer.apple.com/forums/thread/667357

I tried decreasing the size, but that didn't help:

"I would assume based on the other question with Abort(), that Abort() is called if it is about to crash, and it seems that the view isn't getting the bounds of the screen in the live view, so it doesn't know how/where to render the view."

I am new to CoreML, and am having difficulties with turning a MLMultiArray (named modelInput) into the required type MLFeatureProvider to feed as a parameter when using myMLModel.prediction(from: modelInput). The error reads:

Consider some struct (HiddenInaccessibleStruct) that is not accessible, but implements an API trait. The only way to obtain an object of this hidden type is by calling a function, that returns an opaque implementation of this type. Another struct owns some type, that makes use of this API trait. Right now, it seems not possible to assign this field in fn new(). The code below can also be found in rust playgrounds.

I am making an PlaygroundBook for Swift Playgrounds [Not Xcode Playgrounds]. I want pass data between playground pages. Example, I have an public variable in UserModule and its value is 0. In first page, user change this variable to 1. When user go to second page, variable's value is 0. But I want its value is user's value (1). How can I do that?

I'm using SwiftUI. I tried to use UserDefaults but UserDefaults won't work truly in Swift Playgrounds. And also try to save datas to a JSON file but Playground won't write files (only read). I also tried this but it isn't work too.

I cannot access GameView from WelcomeView. How can I get page Navigation in Playground Book ?

Error

I would like to recursively query the children element of the Books.app to fetch all the clickable elements.

However, I noticed I can't seem to fetch the value of the AXChildren attribute from the Books window element.

Code snippet you can try out in Playgrounds:

While testing Scala code, I've run into a strange NPE while asserting on a value from an object.

Here is the minimal code to reproduce the issue:

main/scala/Playground.scala:

I'm creating a sort of drum pad app, and it seems like AKPlayer is the best of many classes available in AudioKit for playing my samples.

Trouble is, when I start playing a low-frequency (bass note) sample, there's always a clicking sound (or "pop") when playing the sample!

This can be easily heard by running an unmodified "Mixing Nodes" demo from the AudioKit Playgrounds. Turn down the volume on everything but the Bass, and you'll notice the clicking every time the Bass sample loops.

I also tested the issue with AVFoundation and it is the case too. This only happens with low frequency sounds like bass. Lead and other sounds dont produce this. I also tested with my own bass sample and same issue was here.

Here is the code for both: