Can you provide your source code?

Yes, it is possible to train PyTorch models directly on an iPhone via the GPU. PyTorch provides support for Metal, which is Apple's low-level, low-overhead graphics API. You can use the PyTorch Metal API to write custom metal shader functions that can be executed on the GPU, allowing you to perform computationally intensive tasks, such as training a deep learning model. You can check Metal here: https://developer.apple.com/metal/ However, training a deep learning model on an iPhone can be challenging due to the limited computational resources available on the device. Additionally, it may also be difficult to manage the data transfer to and from the device. It's generally recommended to perform model training on a more powerful machine and then deploy the trained model to the iPhone for inference.

MTKView and CAMetalLayer are part of the Metal framework for iOS and macOS, which is used for low-level, high-performance graphics rendering. An MTKView is a view that is capable of displaying Metal content. It uses a CAMetalLayer to manage the underlying Metal drawable and to present the rendered content on the screen. The CAMetalLayer is a subclass of CALayer that is optimized for Metal content, and it provides a metal layer that can be used for Metal rendering. Extended color spaces are color spaces that are beyond the standard sRGB color space, and they can represent a wider range of colors. iOS and macOS support extended color spaces such as P3 and Display P3, which are used for displaying content with a wider color gamut on high-end displays. When an MTKView or a CAMetalLayer is created, you can specify the desired color space to use, and the framework will take care of automatically converting the content to the display's color space.

If you want to get current user location on real-time, you can check this video: https://www.youtube.com/watch?v=hWMkimzIQoU But if you only want to set your location on the simulator, just open the simulator, navigate to the > Features > Location > Custom location and enter your longitude and latitude. You can find your coordinates on the internet by searching " YourLocation longitude and latitude"

Since iOS 16, you can not activate developer mode from your iPhone. You have to use Xcode to enable it. Connect your phone physically to your macbook, open Xcode, navigate to Settings -> Privacy & Security you should be able to see developer mode there.