gnu: Add python-onnx.

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

Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>

gnu/local.mk

@@ -1464,6 +1464,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/python-memcached-syntax-warnings.patch	\
   %D%/packages/patches/python-mox3-python3.6-compat.patch	\
   %D%/packages/patches/python-testtools.patch			\
+  %D%/packages/patches/python-onnx-use-system-googletest.patch	\
   %D%/packages/patches/python-packaging-test-arch.patch		\
   %D%/packages/patches/python2-parameterized-docstring-test.patch	\
   %D%/packages/patches/python-paste-remove-timing-test.patch	\

gnu/packages/machine-learning.scm

@@ -15,6 +15,7 @@
 ;;; Copyright © 2019 Brett Gilio <brettg@gnu.org>
 ;;; Copyright © 2020 Konrad Hinsen <konrad.hinsen@fastmail.net>
 ;;; Copyright © 2020 Edouard Klein <edk@beaver-labs.com>
+;;; Copyright © 2020 Vinicius Monego <monego@posteo.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -53,6 +54,7 @@
   #:use-module (gnu packages boost)
   #:use-module (gnu packages check)
   #:use-module (gnu packages compression)
+  #:use-module (gnu packages cmake)
   #:use-module (gnu packages cran)
   #:use-module (gnu packages databases)
   #:use-module (gnu packages dejagnu)
@@ -70,6 +72,7 @@
   #:use-module (gnu packages pkg-config)
   #:use-module (gnu packages protobuf)
   #:use-module (gnu packages python)
+  #:use-module (gnu packages python-check)
   #:use-module (gnu packages python-science)
   #:use-module (gnu packages python-web)
   #:use-module (gnu packages python-xyz)
@@ -576,6 +579,46 @@ tools.  This enables both rapid prototyping of data pipelines and extensibility
 in terms of new algorithms.")
     (license license:gpl3+)))
 
+(define-public python-onnx
+  (package
+    (name "python-onnx")
+    (version "1.7.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "onnx" version))
+       ;; ONNX will build googletest from a git checkout.  Patch CMake
+       ;; to use googletest from Guix and enable tests by default.
+       (patches (search-patches "python-onnx-use-system-googletest.patch"))
+       (sha256
+        (base32 "0j6rgfbhsw3a8id8pyg18y93k68lbjbj1kq6qia36h69f6pvlyjy"))))
+    (build-system python-build-system)
+    (native-inputs
+     `(("cmake" ,cmake)
+       ("googletest" ,googletest)
+       ("pybind11" ,pybind11)
+       ("python-coverage" ,python-coverage)
+       ("python-nbval" ,python-nbval)
+       ("python-pytest" ,python-pytest)
+       ("python-pytest-runner" ,python-pytest-runner)))
+    (inputs
+     `(("protobuf" ,protobuf)))
+    (propagated-inputs
+     `(("python-numpy" ,python-numpy)
+       ("python-protobuf" ,python-protobuf)
+       ("python-six" ,python-six)
+       ("python-tabulate" ,python-tabulate)
+       ("python-typing-extensions"
+        ,python-typing-extensions)))
+    (home-page "https://onnx.ai/")
+    (synopsis "Open Neural Network Exchange")
+    (description
+     "Open Neural Network Exchange (ONNX) provides an open source format for
+AI models, both deep learning and traditional ML.  It defines an extensible
+computation graph model, as well as definitions of built-in operators and
+standard data types.")
+    (license license:expat)))
+
 (define-public rxcpp
   (package
     (name "rxcpp")

gnu/packages/patches/python-onnx-use-system-googletest.patch

@@ -0,0 +1,54 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 0aa9fda2..a573170c 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -22,7 +22,7 @@ option(BUILD_ONNX_PYTHON "Build Python binaries" OFF)
+ option(ONNX_GEN_PB_TYPE_STUBS "Generate protobuf python type stubs" ON)
+ option(ONNX_WERROR "Build with Werror" OFF)
+ option(ONNX_COVERAGE "Build with coverage instrumentation" OFF)
+-option(ONNX_BUILD_TESTS "Build ONNX C++ APIs Tests" OFF)
++option(ONNX_BUILD_TESTS "Build ONNX C++ APIs Tests" ON)
+ option(ONNX_USE_LITE_PROTO "Use lite protobuf instead of full." OFF)
+ option(ONNXIFI_ENABLE_EXT "Enable onnxifi extensions." OFF)
+ if(NOT DEFINED ONNX_ML)
+@@ -82,8 +82,10 @@ if(CMAKE_SYSTEM_NAME STREQUAL "AIX")
+ endif()
+
+ if(ONNX_BUILD_TESTS)
+-  list(APPEND CMAKE_MODULE_PATH ${ONNX_ROOT}/cmake/external)
+-  include(googletest)
++  find_package(GTest REQUIRED)
++  if(NOT GTest_FOUND)
++    message(FATAL_ERROR "cannot find googletest")
++  endif()
+ endif()
+
+ if((ONNX_USE_LITE_PROTO AND TARGET protobuf::libprotobuf-lite) OR ((NOT ONNX_USE_LITE_PROTO) AND TARGET protobuf::libprotobuf))
+diff --git a/cmake/unittest.cmake b/cmake/unittest.cmake
+index e29a93ff..ae146390 100644
+--- a/cmake/unittest.cmake
++++ b/cmake/unittest.cmake
+@@ -6,8 +6,8 @@ include(${ONNX_ROOT}/cmake/Utils.cmake)
+
+ find_package(Threads)
+
+-set(${UT_NAME}_libs ${googletest_STATIC_LIBRARIES})
+-set(${ONNXIFI_TEST_DRIVER}_libs ${googletest_STATIC_LIBRARIES})
++set(${UT_NAME}_libs ${GTEST_LIBRARIES})
++set(${ONNXIFI_TEST_DRIVER}_libs ${GTEST_LIBRARIES})
+
+ list(APPEND ${UT_NAME}_libs onnx)
+ list(APPEND ${UT_NAME}_libs onnx_proto)
+@@ -31,10 +31,10 @@ function(AddTest)
+   list(REMOVE_DUPLICATES _UT_SOURCES)
+
+   add_executable(${_UT_TARGET} ${_UT_SOURCES})
+-  add_dependencies(${_UT_TARGET} onnx onnx_proto googletest)
++  add_dependencies(${_UT_TARGET} onnx onnx_proto)
+
+   target_include_directories(${_UT_TARGET}
+-                             PUBLIC ${googletest_INCLUDE_DIRS}
++                             PUBLIC ${GTEST_INCLUDE_DIRS}
+                                     ${ONNX_INCLUDE_DIRS}
+                                     ${PROTOBUF_INCLUDE_DIRS}
+                                     ${ONNX_ROOT}