Difference between tfjs_layers_model and tfjs_graph_model

Question

The tensorflowjs converter has the output formats

tfjs_layers_model, tfjs_graph_model

What is the dif

Answer 1

There seem to be only certain pairs of input and output formats that work, namely

`keras` | `tfjs_layers_model` 
`keras_saved_model` | `tfjs_layers_model`
`tf_hub` | `tfjs_graph_model`
`tf_saved_model` | `tfjs_graph_model`

Answer 2

It seems like information about this is fragmented all over a few repos and websites linked below, so I have done the detective work