* 15 pages, 10 figures, Oral Presentation at the ICLR 2022 Workshop on
Elements of Reasoning: Objects, Structure, and Causality Access Paper or Ask Questions
* Long Presentation at the Thirty-eighth International Conference on
Machine Learning (ICML) 2021. 21 pages, 11 figures. v2: updated
acknowledgments. v3: clarified that the internal function nodes of the credit
assignment mechanism are not considered O(1) Access Paper or Ask Questions