vincekurtz / ltl_gcs

Linear Temporal Logic Motion Planning with Graphs of Convex Sets

Temporal Logic Motion Planning with Graphs of Convex Sets

A fast and scalable motion planning framework for tasks expressed in Linear Temporal Logic (LTL).

This repository contains code to accompany the paper Temporal Logic Motion Planning with Convex Optimization via Graphs of Convex Sets by Vince Kurtz and Hai Lin.

Installation

Make sure all dependencies are installed, then:

$ git clone https://github.com/vincekurtz/ltl_gcs
$ cd ltl_gcs
$ pip install .

Dependencies

• Drake
• MONA
• ltlf2dfa
• MOSEK (license only)
• treelib
• matplotlib
• scipy
• sympy
• numpy
• graphviz
• pydot

Of these, only MONA and MOSEK require special consideration: all others can be installed with pip. For MOSEK, you only need a valid license: MOSEK itself is installed along with Drake.

Examples

The following examples and several other can be found in the examples directory.

Key-door puzzle

Don't pass through a door until picking up a corresponding key, and eventually reach a goal.

LTL specification:

$$ \varphi = (\lnot door_1 \mathsf{U} key_1) \land (\lnot door_2 \mathsf{U} key_2) \land \lozenge goal $$

Solution:

File: examples/key_door.py

Large key-door puzzle

A similar task, but with more keys and doors.

LTL specification:

$$ \varphi = \bigwedge_{i=1}^5 (\lnot d_i \mathsf{U} k_i) \land \lozenge goal $$

Solution:

File: examples/door_puzzle.py

Randomly-generated multi-target scenario

Eventually visit $a$, $c$, and $d$, and always avoid $b$:

LTL specification:

$$ \varphi = \lozenge a \land \square \lnot b \land \lozenge c \land \lozenge d $$

Solution:

File: examples/random_polytopes.py

Franka Panda Manipulator Arm

Eventually reach a target, and don't pass through a doorway until pressing a button. For this example, run the drake-visualizer to view the result.

LTL specification:

$$ \varphi = \lozenge target \land \lnot doorway \mathsf{U} button $$

Solution:

File: examples/robot_arm.py

Atlas Humanoid

Touch the green target with the left hand, then touch the red target with the right foot, then touch the blue target with the right hand. For this example, run the drake-visualizer to view the result.

LTL specification:

$$ \varphi = \lozenge (left\_hand \land \lozenge (right\_foot \land \lozenge right\_hand)) $$

Solution:

File: examples/atlas.py