✨ Depth AIG for level computation

CMakeLists.txt

@@ -18,7 +18,7 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 # Set the project name and version
 project(
   aigverse
-  VERSION 0.0.8
+  VERSION 0.0.9
   DESCRIPTION
     "A Python library for working with logic networks, synthesis, and optimization."
   HOMEPAGE_URL "https://github.com/marcelwa/aigverse"

README.md

@@ -94,6 +94,20 @@ for fanin in aig.fanins(f_and):
     print(f"Fanin of {f_and}: {fanin}")
 ```
 
+### Depth and Level Computation
+
+You can compute the depth of the AIG network and the level of each node. Depth information is useful for estimating the
+critical path delay of a respective circuit.
+
+```python
+from aigverse import DepthAig
+
+depth_aig = DepthAig(aig)
+print(f"Depth: {depth_aig.num_levels()}")
+for node in aig.nodes():
+    print(f"Level of {node}: {depth_aig.level(node)}")
+```
+
 ### Logic Optimization
 
 You can optimize AIGs using various algorithms. For example, you can perform resubstitution to simplify logic using

bindings/aigverse/include/aigverse/algorithms/equivalence_checking.hpp

@@ -5,8 +5,6 @@
 #ifndef AIGVERSE_EQUIVALENCE_CHECKING_HPP
 #define AIGVERSE_EQUIVALENCE_CHECKING_HPP
 
-#include <fmt/format.h>
-#include <lorina/aiger.hpp>
 #include <lorina/diagnostics.hpp>
 #include <mockturtle/algorithms/equivalence_checking.hpp>
 #include <mockturtle/algorithms/miter.hpp>
@@ -17,7 +15,6 @@
 #include <cstdint>
 #include <optional>
 #include <stdexcept>
-#include <string>
 
 namespace aigverse
 {

bindings/aigverse/include/aigverse/algorithms/refactoring.hpp

@@ -5,13 +5,11 @@
 #ifndef AIGVERSE_REFACTORING_HPP
 #define AIGVERSE_REFACTORING_HPP
 
-#include <fmt/format.h>
 #include <mockturtle/algorithms/cleanup.hpp>
 #include <mockturtle/algorithms/node_resynthesis/sop_factoring.hpp>
 #include <mockturtle/algorithms/refactoring.hpp>
 #include <mockturtle/networks/aig.hpp>
 #include <pybind11/pybind11.h>
-#include <pybind11/stl.h>
 
 #include <cstdint>
 

bindings/aigverse/include/aigverse/algorithms/resubstitution.hpp

@@ -5,13 +5,11 @@
 #ifndef AIGVERSE_RESUBSTITUTION_HPP
 #define AIGVERSE_RESUBSTITUTION_HPP
 
-#include <fmt/format.h>
 #include <mockturtle/algorithms/aig_resub.hpp>
 #include <mockturtle/algorithms/cleanup.hpp>
 #include <mockturtle/algorithms/resubstitution.hpp>
 #include <mockturtle/networks/aig.hpp>
 #include <pybind11/pybind11.h>
-#include <pybind11/stl.h>
 
 #include <cstdint>
 

bindings/aigverse/include/aigverse/algorithms/rewriting.hpp

@@ -5,13 +5,10 @@
 #ifndef AIGVERSE_REWRITING_HPP
 #define AIGVERSE_REWRITING_HPP
 
-#include <fmt/format.h>
-#include <mockturtle/algorithms/cleanup.hpp>
 #include <mockturtle/algorithms/cut_rewriting.hpp>
 #include <mockturtle/algorithms/node_resynthesis/xag_npn.hpp>
 #include <mockturtle/networks/aig.hpp>
 #include <pybind11/pybind11.h>
-#include <pybind11/stl.h>
 
 #include <cstdint>
 #include <optional>
@@ -46,7 +43,8 @@ void rewriting(pybind11::module& m)
             params.verbose                                 = verbose;
             params.very_verbose                            = very_verbose;
 
-            mockturtle::xag_npn_resynthesis<Ntk, mockturtle::aig_network, mockturtle::xag_npn_db_kind::aig_complete>
+            const mockturtle::xag_npn_resynthesis<Ntk, mockturtle::aig_network,
+                                                  mockturtle::xag_npn_db_kind::aig_complete>
                 aig_npn_resyn_engine{};
 
             ntk = mockturtle::cut_rewriting(ntk, aig_npn_resyn_engine, params);

bindings/aigverse/include/aigverse/io/write_aiger.hpp

@@ -6,7 +6,6 @@
 #define AIGVERSE_WRITE_AIGER_HPP
 
 #include <fmt/format.h>
-#include <lorina/aiger.hpp>
 #include <mockturtle/io/write_aiger.hpp>
 #include <mockturtle/networks/aig.hpp>
 #include <pybind11/pybind11.h>

bindings/aigverse/include/aigverse/networks/logic_networks.hpp

@@ -83,13 +83,6 @@ void network(pybind11::module& m, const std::string& network_name)
         .def("num_pos", &Ntk::num_pos)
         .def("num_cos", &Ntk::num_cos)
 
-        .def("num_levels",
-             [](const Ntk& ntk) -> uint32_t
-             {
-                 mockturtle::depth_view depth_ntk{ntk};
-                 return depth_ntk.depth();
-             })
-
         .def("get_node", &Ntk::get_node, "s"_a)
         .def("make_signal", &Ntk::make_signal, "n"_a)
         .def("is_complemented", &Ntk::is_complemented, "s"_a)
@@ -220,6 +213,23 @@ void network(pybind11::module& m, const std::string& network_name)
             "is_nary_or", [](const Ntk& ntk, const mockturtle::node<Ntk>& n) { return ntk.is_nary_or(n); }, "n"_a)
 
         ;
+
+    /**
+     * Depth Network.
+     */
+    using DepthNtk = mockturtle::depth_view<Ntk>;
+    py::class_<DepthNtk, Ntk>(m, fmt::format("Depth{}", network_name).c_str())
+        .def(py::init<>())
+        .def(py::init<const Ntk&>(), "ntk"_a)
+        .def(py::init<const DepthNtk&>(), "ntk"_a)
+
+        .def("num_levels", &DepthNtk::depth)
+        .def("level", &DepthNtk::level, "n"_a)
+        .def("is_on_critical_path", &DepthNtk::is_on_critical_path, "n"_a)
+        .def("update_levels", &DepthNtk::update_levels)
+        .def("create_po", &DepthNtk::create_po, "f"_a)
+
+        ;
 }
 
 }  // namespace detail

bindings/aigverse/test/networks/test_aig.py

@@ -290,28 +290,21 @@ def test_aig_structural_properties(self):
         self.assertTrue(hasattr(aig, 'num_pis'))
         self.assertTrue(hasattr(aig, 'num_pos'))
         self.assertTrue(hasattr(aig, 'num_gates'))
-        self.assertTrue(hasattr(aig, 'num_levels'))
         self.assertTrue(hasattr(aig, 'fanin_size'))
         self.assertTrue(hasattr(aig, 'fanout_size'))
 
         # Create two primary inputs
         x1 = aig.create_pi()
         x2 = aig.create_pi()
 
-        self.assertEqual(aig.num_levels(), 0)
-
         # Create AND and OR gates
         f1 = aig.create_and(x1, x2)
         f2 = aig.create_or(x1, x2)
 
-        self.assertEqual(aig.num_levels(), 0)
-
         # Create primary outputs
         aig.create_po(f1)
         aig.create_po(f2)
 
-        self.assertEqual(aig.num_levels(), 1)
-
         # Check structural properties
         self.assertEqual(aig.size(), 5)
         self.assertEqual(aig.num_pis(), 2)
@@ -527,5 +520,53 @@ def test_aig_node_signal_iteration(self):
         self.assertEqual(mask, 2)
 
 
+class TestDepthAig(unittest.TestCase):
+    def test_depth_aig(self):
+        aig = DepthAig()
+
+        self.assertTrue(hasattr(aig, 'num_levels'))
+        self.assertTrue(hasattr(aig, 'level'))
+        self.assertTrue(hasattr(aig, 'is_on_critical_path'))
+        self.assertTrue(hasattr(aig, 'update_levels'))
+        self.assertTrue(hasattr(aig, 'create_po'))
+
+        # Create primary inputs
+        x1 = aig.create_pi()
+        x2 = aig.create_pi()
+        x3 = aig.create_pi()
+
+        self.assertEqual(aig.num_levels(), 0)
+
+        # Create AND gates
+        n4 = aig.create_and(~x1, x2)
+        n5 = aig.create_and(x1, n4)
+        n6 = aig.create_and(x3, n5)
+        n7 = aig.create_and(n4, x2)
+        n8 = aig.create_and(~n5, ~n7)
+        n9 = aig.create_and(~n8, n4)
+
+        # Create primary outputs
+        aig.create_po(n6)
+        aig.create_po(n9)
+
+        # Check the depth of the AIG
+        self.assertEqual(aig.num_levels(), 4)
+
+        self.assertEqual(aig.level(aig.get_node(x1)), 0)
+        self.assertEqual(aig.level(aig.get_node(x2)), 0)
+        self.assertEqual(aig.level(aig.get_node(x3)), 0)
+        self.assertEqual(aig.level(aig.get_node(n4)), 1)
+        self.assertEqual(aig.level(aig.get_node(n5)), 2)
+        self.assertEqual(aig.level(aig.get_node(n6)), 3)
+        self.assertEqual(aig.level(aig.get_node(n7)), 2)
+        self.assertEqual(aig.level(aig.get_node(n8)), 3)
+        self.assertEqual(aig.level(aig.get_node(n9)), 4)
+
+        # Copy constructor
+        aig2 = DepthAig(aig)
+
+        self.assertEqual(aig2.num_levels(), 4)
+
+
 if __name__ == '__main__':
     unittest.main()

pyproject.toml

@@ -9,7 +9,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "aigverse"
-version = "0.0.8"
+version = "0.0.9"
 description = "A Python library for working with logic networks, synthesis, and optimization."
 readme = "README.md"
 authors = [

setup.py

@@ -83,7 +83,7 @@ def build_extension(self, ext):
 
 setup(
     name='aigverse',
-    version='0.0.8',
+    version='0.0.9',
     author='Marcel Walter',
     author_email='marcel.walter@tum.de',
     description='A Python library for working with logic networks, synthesis, and optimization.',