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Quick start
Fast Downward is released in four flavours: tarball, Singularity, Docker and Vagrant. We provide below a few instructions to get you started as quickly as possible. You can find a more detailed description on ObtainingAndRunningFastDownward and PlannerUsage.
What flavour is for me?
running experiments: We recommend Singularity or the tarball. Docker is an alternative, but be mindful of its significant overhead.
teaching: We recommend Vagrant.
development: We recommend working on a clone of the master repository.
See WhatFlavourIsForMe for a more detailed discussion.
Running the Singularity image
We assume that Singularity is installed on your machine. We have tested Singularity 2.6, 3.2, and 3.5. Here is how you can download the planner image and run the LAMA-first configuration to solve a planning task located in the $BENCHMARKS directory. LAMA-first is designed to find solutions quickly without much regard for plan cost:
Unlike Docker (see below), $BENCHMARKS does not have to be an absolute path.
Alternative way without "singularity run"
With reasonably recent versions of Singularity, the image file can be executed directly like a script, leading to a simpler usage than via singularity run. For example, you can download and run the planner like this:
Troubleshooting
Depending on your configuration, the singularity pull step might produce an error message like the following:
ERROR : Called singularity_config_get_value on uninitialized config subsystem ABORT : Retval = 255
In our experience, this error can be ignored.
Running the Docker image
We assume that Docker is installed on your machine. You want to solve a planning problem located on the $BENCHMARKS directory. You can run the same LAMA-first configuration as before:
1 sudo docker run --rm -v $BENCHMARKS:/benchmarks aibasel/downward --alias lama-first /benchmarks/gripper/prob01.pddl
Note the use of sudo (Docker usually requires root privileges).
Note that this mounts the local directory $BENCHMARKS of your host machine under the container directory /benchmarks, which is the place where the containerized planner looks for the problem. The path stored in the $BENCHMARKS variable must be absolute.
The Docker image for Fast Downward is installed on your machine as a side-effect of the command.
Using a Vagrant machine
We assume that Vagrant is installed on your machine. You can use the Fast Downward Vagrantfile as follows:
Place the Vagrantfile for the desired release into some empty directory.
Put your PDDL files into the same directory as the Vagrantfile, say, under names domain.pddl and problem.pddl.
Navigate to this directory and type vagrant up.
Log into the Vagrant virtual machine by typing vagrant ssh.
Run downward/fast-downward.py --alias lama-first /vagrant/domain.pddl /vagrant/problem.pddl.
Type exit to leave the virtual machine, then vagrant halt to stop it.
Source code
See ObtainingAndRunningFastDownward for a complete description on how to build the planner from source.
Next steps
See other ways of invoking the planner on PlannerUsage.
Read about recommended experiment setups.
Go through the full Documentation.