BNC_SDD

Converts a Bayesian Network Classifier (BNC) into a Sentential Decision Diagram (SDD) by first compiling an Ordered Decision Diagram (ODD) and then converting the ODD into a SDD. The algorithm is described in the following paper:

Compiling Bayesian Networks into Decision Graphs
In Proceedings of the Thirty-Third AAAI Conference on Artificial Intelligence (AAAI), 2019
Andy Shih, Arthur Choi, Adnan Darwiche

Input Format

The input BNC is specified using "config.json". It should have a JSON object with the following fields:

• "id": some number to help you distinguish the compilation task
• "name": name of the .net or the .uai Bayesian Network file
• "filetype": filetype of the Bayesian Network file (either ".net" or ".uai")
• "vars": number of feature variables
• "root": class node of the Bayesian Network Classifier
• "leaves": a list of the feature variables. If empty, defaults to all leaves of the Bayesian Network. If not empty, length should match "vars"
• "threshold": threshold of the Bayesian Network Classifier
• "input_filepath": filepath of the Bayesian Network file
• "output_filepath": filepath to write the output ODD and SDD

The underlying Bayesian Network of the BNC is specified as a .net file or a .uai file. The file that will be looked up is config["input_filepath"] + config["name"] + "." + config["filetype"]. For example, if the filepath of the network file is at "networks/binarynetworks/admission.net", then we set config["input_filepath"]: "networks/binarynetworks/", config["name"]: "admission", and config["filetype"]: "net".

Assumptions

The underlying Bayesian Network should be completely binary (all interal nodes and leaves are binary). Furthermore, there should be no hard CPTs (no 0/1 values in CPTS).

Output Format

The output of the program will be 4 files:

• ODD file: The ODD representation of the decision function of the BNC
• SDD file: The SDD representation of the decision function of the BNC
• vtree file: The vtree accompanying the SDD
• variable description file: A description of the variables of the ODD/SDD (includes variable order, metadata)

The ODD file will be written at config["output_filepath"] + config["name"] + "_" + config["id"] + ".odd"

The SDD file will be written at config["output_filepath"] + config["name"] + "_" + config["id"] + ".sdd"

The vtree file will be written at config["output_filepath"] + config["name"] + "_" + config["id"] + ".vtree"

The variable description file will be written at config["output_filepath"] + config["name"] + "_" + config["id"] + ".txt"

Running BNC_SDD

./run

Further Questions

Contact us at

Andy Shih: andyshih@cs.ucla.edu
Arthur Choi: aychoi@cs.ucla.edu
Adnan Darwiche: darwiche@cs.ucla.edu