VLSI Multi Paradigm Solver

Very large-scale integration (VLSI) is the process of integrating or embedding hundreds of thousands of transistors on a single silicon semiconductor microchip.

Introduction

This is the project work of the Combinatorial Decision Making and Optimization course of the Master's degree in Artificial Intelligence of Univeristy of Bologna.

The group members are:

Name	Surname	Email
Alessandro	Lombardini	alessandr.lombardin3@studio.unibo.it
Giacomo	Melacini	giacomo.melacini@studio.unibo.it
Matteo	Rossi Reich	matteo.rossireich@studio.unibo.it
Lorenzo	Tribuiani	lorenzo.tribuiani@studio.unibo.it

Prerequisites

CP

• Minizinc
  Install Minizinc IDE and add the bin folder to your System Path

• Or-Tools

  1. Download the Or-Tools flat-zinc from Or-Tools Git Hub (or_tools_flatzinc_VisualStudio-64bit_v9.3.10497.zip).

  2. Extract the folder

  3. Go on Minizinc IDE and go in: Minizinc -> Preferences -> Solvers

  4. Under the list of solvers select Add new...

  5. In the opening tab insert the following:

     • Name: Or-Tools
     • Solver-ID: com.google.or-tools
     • Version: 9.3.1
     • Executable: path to the bin extracted
     • Solver library path: add a new folder called Or-Tools
     • Select -v flag

  6. Click Add

MIP

Install AMPL from AMPL website

Required Packages and installation

1. Clone repository

2. Open a terminal

3. Create and activate a virtual environment with:

   python -m venv [name-of-venv]

   ./[name-of-venv]/Scripts/activate

4. Install the requirements with:

   pip install -r requirements.txt

5. Install MathSat and Z3 via pySMT following the instructions defined here https://pysmt.readthedocs.io/en/latest/getting_started.html

Usage

Once the project is installed, to run an execution give, from the root directory:

python main.py {CP, SAT, SMT, LP} ... [-h] [-v] [-i] [-p] [-r]

In the following table all the optional and positional argument (shared or selective from paradigm) are reported:

TABLE OF COMMANDS
Long argument	Short argument	Description	Allowed params
OPTIONAL SHARED PARAMETERS
--verbose	-v	Toggle verbosity	None
--ins	-i	Select instance to solve	1-40 omit to execute all
--print_img	-p	Toggle image saving	None
--rotation	-r	Toggle solving with allowed rotation	None
POSITIONAL ARGUMENTS
paradigm		Select the solving paradigm	CP | SAT | SMT | MIP
CP REQUIRED ARGUMENTS
--model	-m	Select CP model	std | cml | syb (one or more)
--solver	-s	Select CP solver	chuffed | gecode | or-tools (one or more)
SAT REQUIRED ARGUMENTS
--model	-m	Select SAT model	SATModel | SATModelBorders
SAT OPTIONAL ARGUMENTS
--symmetry_breaking	-sb	Choose if the symmetry breaking constraint has to be used	None
--encoding	-e	Select SAT encoding	seq | np | bw | he
SMT REQUIRED ARGUMENTS
--model	-m	Select SMT model	z3Py | z3Py_rotation | z3Py_parallel | pySMT_z3 | pySMT_msat
MIP REQUIRED ARGUMENTS
--mode	-m	Select MIP model	std | strong (one or both)
--solver	-s	Select MIP solver	gurobi | cplex | copt | highs | xpress (one or more)
MIP OPTIONAL ARGUMENTS
--ampl_dir	-a	If the AMPL installation directory is not in the system search path, specify the full path to the AMPL installation directory	String with full path to AMPL installation dir