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I ran into an issue where save_layer in model_utils.py is giving me an error that: AttributeError: 'Dense' object has no attribute 'output_shape'
I found that layer.output.shape works, but isn't always a tuple, which runs afoul of the JSON encoder. So I added check for that too.
I modified the code and it seems to work on Macos, Linux, Windows. I've included my debugging print statements so you can see what I was looking at.