Be able to output the dl4j computationGraph.summary() for debugging purposes

Nobody has claimed this yet.

I had some problems to output the dl4j computationGraph.summary(). After configuring the logging right, I succeeded to output it for training.

But still, after deserializing the prepared dag, something like this is not possible:

NeuralNetwork.Prepared p = prepared.producers(NeuralNetwork.Prepared.class).findFirst().get().peek();
System.out.println(p.getComputationGraph().summary());

Perhaps add some additional logs or allow such a code from above (by making some more things public)?

It would also be great to be able to add some handlers/listeners for training like it is possible in dl4j (for example to save the model after every epoch, or doing some more evaluation every epoch).

Start by tracing NeuralNetwork.Prepared, producers(...).peek(), and getComputationGraph() through the repository, then inspect the training path and deserialization behavior. Done would require a decided scope for exposing computationGraph.summary() and/or adding training listeners, with documented behavior and tests for the selected API.

Written by the indexing model from the issue text.