gnu: Add onnx-optimizer.

* gnu/packages/machine-learning.scm (onnx-optimizer): New variable.
* gnu/packages/patches/onnx-optimizer-system-library.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -1512,6 +1512,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/ocaml-dose3-Install-mli-cmx-etc.patch	\
   %D%/packages/patches/omake-fix-non-determinism.patch	\
   %D%/packages/patches/oneko-remove-nonfree-characters.patch	\
+  %D%/packages/patches/onnx-optimizer-system-library.patch	\
   %D%/packages/patches/onnx-use-system-googletest.patch	\
   %D%/packages/patches/onnx-shared-libraries.patch	\
   %D%/packages/patches/onnx-skip-model-downloads.patch		\

gnu/packages/machine-learning.scm

@@ -675,6 +675,50 @@ standard data types.")
   ;; headers, hence the name change.
   (deprecated-package "python-onnx" onnx))
 
+(define-public onnx-optimizer
+  (package
+    (name "onnx-optimizer")
+    ;; Note: 0.2.x is *more* recent than 1.5.0.
+    (version "0.2.6")
+    (home-page "https://github.com/onnx/optimizer")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url home-page)
+                    (commit (string-append "v" version))))
+              (sha256
+               (base32
+                "1wkqqdxcxpfbf8zpbdfdd3zz5jkw775g31gyykj11z4y6pp659l6"))
+              (file-name (git-file-name name version))
+              (patches (search-patches "onnx-optimizer-system-library.patch"))
+              (modules '((guix build utils)))
+              (snippet '(delete-file-recursively "third_party"))))
+    (build-system python-build-system)
+    (arguments (package-arguments onnx))          ;reuse build system tweaks
+    (native-inputs
+     `(("cmake" ,cmake)
+       ("python-pytest" ,python-pytest)
+       ("python-pytest-runner" ,python-pytest-runner)
+       ("python-nbval" ,python-nbval)
+       ("python-coverage" ,python-coverage)))
+    (inputs
+     `(("onnx" ,onnx)
+       ("protobuf" ,protobuf)
+       ("pybind11" ,pybind11)))
+    (propagated-inputs
+     `(("python-numpy" ,python-numpy)))
+    (synopsis "Library to optimize ONNX models")
+    (description
+     "This package provides a C++ and Python library for performing arbitrary
+optimizations on ONNX models, as well as a growing list of prepackaged
+optimization passes.
+
+Not all possible optimizations can be directly implemented on ONNX graphs---
+some will need additional backend-specific information---but many can, and the
+aim is to provide all such passes along with ONNX so that they can be re-used
+with a single function call.")
+    (license license:expat)))
+
 (define-public rxcpp
   (package
     (name "rxcpp")

gnu/packages/patches/onnx-optimizer-system-library.patch

@@ -0,0 +1,53 @@
+Arrange so that onnx-optimizer (1) uses our own ONNX build, 
+(2) builds as a shared library, and (3) links against the shared
+libraries of ONNX.
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index c2e48b35..8af51076 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -9,8 +9,6 @@ endif(NOT MSVC)
+ 
+ set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+ 
+-set(ONNX_ROOT ${PROJECT_SOURCE_DIR}/third_party/onnx)
+-add_subdirectory(${ONNX_ROOT})
+ 
+ file(READ "${PROJECT_SOURCE_DIR}/VERSION_NUMBER" ONNX_OPTIMIZER_VERSION)
+ string(STRIP "${ONNX_OPTIMIZER_VERSION}" ONNX_OPTIMIZER_VERSION)
+@@ -21,14 +19,18 @@ file(GLOB_RECURSE onnx_opt_srcs "onnxoptimizer/*.cc"
+ list(REMOVE_ITEM onnx_opt_srcs "${PROJECT_SOURCE_DIR}/onnxoptimizer/cpp2py_export.cc")
+ 
+ add_library(onnx_optimizer ${onnx_opt_srcs})
+-target_link_libraries(onnx_optimizer PUBLIC onnx)
++target_link_libraries(onnx_optimizer PUBLIC onnx onnx_proto)
+ target_include_directories(onnx_optimizer PUBLIC
+     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>
+     $<INSTALL_INTERFACE:include>
+     )
+ 
++# These cpp macros must be defined so the ONNX headers behave
++# correctly.
++set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DONNX_ML=1 -DONNX_NAMESPACE=onnx")
++
+ add_executable(onnx_optimizer_exec examples/onnx_optimizer_exec.cpp)
+-target_link_libraries(onnx_optimizer_exec onnx_optimizer)
++target_link_libraries(onnx_optimizer_exec onnx_optimizer protobuf)
+ 
+ if(BUILD_ONNX_PYTHON)
+   if("${PY_EXT_SUFFIX}" STREQUAL "")
+@@ -79,11 +81,10 @@ if(BUILD_ONNX_PYTHON)
+                           PRIVATE $<TARGET_OBJECTS:onnx_optimizer>)
+   else()
+     # Assume everything else is like gcc
+-    target_link_libraries(onnx_opt_cpp2py_export
+-                          PRIVATE "-Wl,--whole-archive" $<TARGET_FILE:onnx_optimizer>
+-                                  "-Wl,--no-whole-archive")
++    target_link_libraries(onnx_opt_cpp2py_export PRIVATE onnx_optimizer)
+     set_target_properties(onnx_opt_cpp2py_export
+-                          PROPERTIES LINK_FLAGS "-Wl,--exclude-libs,ALL")
++                          PROPERTIES LINK_FLAGS
++			  "-Wl,-rpath=${CMAKE_INSTALL_PREFIX}/lib")
+   endif()
+ 
+   target_link_libraries(onnx_opt_cpp2py_export PRIVATE onnx_optimizer)