--- a
+++ b/deepvariant/python/direct_phasing_pybind.cc
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2024 Google LLC.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "pybind11/cast.h"
+#if true  // Trick to stop tooling from moving the #include around.
+// MUST appear before any standard headers are included.
+#include <pybind11/pybind11.h>
+#endif
+
+#include <pybind11/stl.h>
+
+#include "deepvariant/direct_phasing.h"
+#include "third_party/nucleus/core/python/type_caster_nucleus_status.h"
+#include "third_party/nucleus/core/python/type_caster_nucleus_statusor.h"
+#include "third_party/nucleus/util/python/type_caster_nucleus_proto_ptr.h"
+#include "pybind11_protobuf/native_proto_caster.h"
+
+namespace py = pybind11;
+
+PYBIND11_MODULE(direct_phasing, m) {
+  pybind11_protobuf::ImportNativeProtoCasters();
+  using namespace ::learning::genomics::deepvariant;  // NOLINT
+
+  py::class_<PhasedVariant>(m, "PhasedVariant")
+      .def_readwrite("position", &PhasedVariant::position)
+      .def_readwrite("phase_1_bases", &PhasedVariant::phase_1_bases)
+      .def_readwrite("phase_2_bases", &PhasedVariant::phase_2_bases);
+
+  py::classh<DirectPhasing>(m, "DirectPhasing")
+      .def(py::init<>())
+      .def("graphviz", &DirectPhasing::GraphViz)
+      .def("get_phased_variants", &DirectPhasing::GetPhasedVariants)
+      .def("phase", &DirectPhasing::PhaseReadsPython, py::arg("candidates"),
+           py::arg("reads"));
+}