Personal Image Classifier and Look Extension: Difference

I found 2 extensions on app inventor website: PIC and Look...
May I know the difference between the two?

The LookExtension embeds the neural network MobileNet and can only recognize classes of objects it has been trained on. PersonalImageClassifier also embeds MobileNet but uses a technique called transfer learning to allow you to train your own classes (via rather than be constrained by the original classes provided by MobileNet.

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Thanks a lot Evan (@ewpatton) sir!!