gnu: python-pytorch: Unbundle NNPACK.

* gnu/packages/machine-learning.scm (python-pytorch)[source]: Delete
"third_party/NNPACK".
[inputs]: Add NNPACK.
[propagated-inputs]: Remove PYTHON-PEACHPY.
* gnu/packages/patches/python-pytorch-system-libraries.patch: Remove
hunk modifying NNPACK; add hunk to allow the use of our own NNPACK.

gnu/packages/machine-learning.scm

@@ -2668,7 +2668,7 @@ (define-public python-pytorch
                               ;; needs these.
                               ;; "FP16" "FXdiv" "gemmlowp" "psimd"
 
-                              "gloo" "googletest" "ios-cmake"
+                              "gloo" "googletest" "ios-cmake" "NNPACK"
                               "onnx" "protobuf" "pthreadpool"
                               "pybind11" "python-enum" "python-peachpy"
                               "python-six" "tbb" "XNNPACK" "zstd"))
@@ -2733,6 +2733,7 @@ (define-public python-pytorch
        ("googletest" ,googletest)
        ("googlebenchmark" ,googlebenchmark)
        ("gloo" ,gloo)
+       ("nnpack" ,nnpack)
        ("openblas" ,openblas)
        ("openmpi" ,openmpi)
        ("pthreadpool" ,pthreadpool)
@@ -2746,7 +2747,6 @@ (define-public python-pytorch
        ("python-numpy" ,python-numpy)
        ("python-pyyaml" ,python-pyyaml)
        ("python-cffi" ,python-cffi)
-       ("python-peachpy" ,python-peachpy)
        ("python-typing-extensions" ,python-typing-extensions)
        ("python-future" ,python-future)
        ("python-six" ,python-six)

gnu/packages/patches/python-pytorch-system-libraries.patch

@@ -81,7 +81,7 @@ diff --git a/torch/lib/c10d/test/CMakeLists.txt b/torch/lib/c10d/test/CMakeLists
 index b74d4b65f7..fc7c207505 100644
 --- a/torch/lib/c10d/test/CMakeLists.txt
 +++ b/torch/lib/c10d/test/CMakeLists.txt
-@@ -16,25 +16,25 @@ function(c10d_add_test test_src)
+@@ -16,24 +16,24 @@ function(c10d_add_test test_src)
    add_test(NAME ${test_name} COMMAND $<TARGET_FILE:${test_name}>)
  endfunction()
  
@@ -115,17 +115,25 @@ index b74d4b65f7..fc7c207505 100644
    endif()
  endif()
 
-diff --git a/CMakeLists.txt b/CMakeLists.txt
+diff --git a/cmake/External/nnpack.cmake b/cmake/External/nnpack.cmake
-index 5ecd2df..24feae3 100644
+index a41343cbb5..6075bdd0a4 100644
---- a/third_party/NNPACK/CMakeLists.txt
+--- a/cmake/External/nnpack.cmake
-+++ b/third_party/NNPACK/CMakeLists.txt
++++ b/cmake/External/nnpack.cmake
-@@ -427,8 +427,7 @@ IF(NNPACK_BACKEND STREQUAL "x86-64")
+@@ -40,7 +40,7 @@ endif()
-       FILE(MAKE_DIRECTORY ${obj_dir})
+ # (3) Android, iOS, Linux, macOS - supported
-       ADD_CUSTOM_COMMAND(
+ ##############################################################################
-         OUTPUT ${obj}
+ 
--        COMMAND "PYTHONPATH=${PEACHPY_PYTHONPATH}"
+-if(ANDROID OR IOS OR ${CMAKE_SYSTEM_NAME} STREQUAL "Linux" OR ${CMAKE_SYSTEM_NAME} STREQUAL "Darwin")
--          ${PYTHON_EXECUTABLE} -m peachpy.x86_64
++if(FALSE)
-+        COMMAND ${PYTHON_EXECUTABLE} -m peachpy.x86_64
+   message(STATUS "Brace yourself, we are building NNPACK")
-             -mabi=sysv -g4 -mimage-format=${PEACHPY_IMAGE_FORMAT}
+   set(CAFFE2_THIRD_PARTY_ROOT ${PROJECT_SOURCE_DIR}/third_party)
-             "-I${PROJECT_SOURCE_DIR}/src" "-I${PROJECT_SOURCE_DIR}/src/x86_64-fma" "-I${FP16_SOURCE_DIR}/include"
+ 
-             -o ${obj} "${PROJECT_SOURCE_DIR}/${src}"
+@@ -114,6 +114,5 @@ endif()
+ # (4) Catch-all: not supported.
+ ##############################################################################
+ 
+-message(WARNING "Unknown platform - I don't know how to build NNPACK. "
+-                "See cmake/External/nnpack.cmake for details.")
+-set(USE_NNPACK OFF)
++set(NNPACK_FOUND TRUE)
++set(USE_NNPACK ON)