Explore network modules that do not require A and B as input.

[cweniger]

Right now, we determine the left- and right-hand sides of the estimated ratios through coupling the estimators to inputs derived from A or B.

Advantages:

• Full flexibility in passing information through to the trained networks
• Transparency

Disadvantages:

• Somewhat confusing for newcomers
• Flexibility is not used anywhere in practice (TBD?)
• Less compatible with NPE, NLE, etc.

I suggest to explore if we can completely remove this construct.