Object Detection to CoreML

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### This issue is for a: (mark with an `x`)
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- [ ] bug report -> please search issues before submitting
- [ ] feature request
- [ x] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
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macOS Mojave
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When I export the object detection model the output that I get from xCode for the neural network is a two-dimensional multiArray. Can someone please provide documentation as to how we can extract the prediction values from this variable? Or can the model export be modified to clearly indicate outputs that are most valuable for the prediction output?