Thank you too for reading my article.

Since this is Apple's built-in pretrained NaturalLanguage model, the results may not be as accurate. You can try using different phrases like "I am happy" and "I am sad" to check if it's working.

If you need something with more accurate results, I would recommend training your own NL model instead of using Apple's model, and then import it using the CoreML framework.

Ref: https://developer.apple.com/documentation/coreml