When saving json model. Just save the first hidden layer

## _What_ is wrong?

I save my models in json files. If the first hidden layer is bigger, the json file gets bigger.
BUT, no matter how big are the second, third, etc layer. Json file size is proportional to the first hidden layer.

## _Where_ does it happen
It happens when saving the json file after training the network

## Expected behavior (i.e. solution)

Shouldn't the json model size be proportional to all layers?