Duet is an inductive program synthesizer that combines top-down deduction and bottom-up enumeration. Because it targets inductive synthesis, which tries to find a program from input-output examples, we support SyGuS instances with input-output examples provided upfront and instances with a functional logical specification (e.g., forall x. f(x) = f'(x) where f is a target function to be synthesized and f' is a known oracle function).

To build Duet, you need

• OCaml >= 4.08.0
• OPAM >= 1.2.2
• Batteries >= 2.3.1
• Ocamlgraph >= 1.8.7
• Core >= 0.13.1
• Containers == 2.8.1
• Z3 == 4.8.1

The easiest way to install Duet is to use OPAM. Once you have cloned the code repository, do the followings:

$ git clone https://github.com/wslee/duet
$ cd duet
$ ./build

Optionally, you may need to set up environment variables to use Z3.

$ export (DY)LD_LIBRARY_PATH=[OPAM home directory (e.g., ~/.opam)]/[your OCaml version (e.g., 4.08.0)]/lib/z3:$(DY)LD_LIBRARY_PATH  # add "DY" on a Mac

After that, you can directly run make.

The following options are available.

• -z3cli Use Z3 via command line interface (make sure the path to z3 is in $PATH). This option is available because sometimes Z3 through OCaml API undesirably behaves.
• -lbu Learning-based unifier. Turn this option if you want to quickly find a conditional program from a small number of input-output examples. If it is turned off, a decision-tree learning-based algorithm will be used (default: false).
• -fastdt Use a heuristic to compute entropies faster. This helps to find conditional programs more quickly but may result in larger solution programs (default: false).
• -ex_all Provide all the IO examples upfront.
• -get_size Get size of a program in the form of s-expression.
• -all Find all possible solutions and pick the smallest one. This may require more synthesis time, but useful for finding smaller solutions (default: false).
• -debug print info for debugging.
• -max_size set the maximum size of candidates (default: 32).
• -max_height set the maximum height of candidates (default: 5).
• -init_comp_size set the initial size of components. The greater number for this option is given, the smaller solution you will get (default: 1).
• -help Display this list of options

# STRING 
$ ./main.native -max_size 400 -lbu tests/string/phone-9-long-repeat.sl 
# BITVEC
$ ./main.native -max_size 10000 -fastdt -ex_all -init_comp_size 3 tests/bitvec/113_10.sl 
# CIRCUIT
$ ./main.native -max_size 128 -max_height 16 tests/circuit/CrCy_10-sbox2-D5-sIn102.sl