gnu: tensorflow-lite: Add python output.

This output corresponds to the pypi "tflite-runtime" package.

* gnu/packages/machine-learning.scm (tensorflow-lite):
[outputs]: Add "python".
[arguments]<#:imported-modules, #:modules>: Add pyproject modules.
<#:phases>: Add 'build-python, 'install-python,
'add-install-to-pythonpath and 'python-sanity-check phases.
[inputs]: Replace python by python-wrapper. Add zlib.
[propagated-inputs]: Add python-numpy.
[native-inputs]: Add pybind11, python-wheel, swig.

Signed-off-by: Andreas Enge <andreas@enge.fr>

gnu/packages/machine-learning.scm

@@ -3206,12 +3206,16 @@ Python.")
         (base32
          "07f4x4g3kwhfjz7iadhqrv97zmw0blacixvca1gdqkqqi7aipxis"))))
     (build-system cmake-build-system)
+    (outputs (list "out" "python"))
     (arguments
      (list
       #:build-type "Release"
+      #:imported-modules (append %cmake-build-system-modules
+                                 %pyproject-build-system-modules)
       #:modules '((ice-9 match)
                   (guix build utils)
-                  (guix build cmake-build-system))
+                  (guix build cmake-build-system)
+                  ((guix build pyproject-build-system) #:prefix py:))
       #:configure-flags
       #~(list
          ;; "-DTFLITE_KERNEL_TEST=ON"  ; TODO: build tests
@@ -3328,17 +3332,46 @@ find_library(ML_DTYPES_LIBRARIES
             (lambda _
               (invoke "cmake" "--build" "." "--target" "benchmark_model"
                       "-j" (number->string (parallel-job-count)))))
-
+          (add-after 'build-benchmark-model 'build-python
+            (lambda* (#:key configure-flags #:allow-other-keys)
+              (let ((script (string-append "../lite/tools/pip_package/"
+                                           "build_pip_package_with_cmake.sh")))
+                (substitute* script
+                  (("\"\\$\\{TENSORFLOW_LITE_DIR\\}\"" all)
+                   (string-append "${CMAKE_ADDITIONAL_CONFIGURE_FLAGS} "
+                                  all)))
+                (setenv "BUILD_NUM_JOBS" (number->string (parallel-job-count)))
+                (setenv "CMAKE_ADDITIONAL_CONFIGURE_FLAGS"
+                        (string-join configure-flags " "))
+                (invoke "sh" script))))
           (add-after 'install 'install-extra
             (lambda _
               (install-file "../build/c/libtensorflowlite_c.so"
                             (string-append #$output "/lib"))
               (install-file "../build/tools/benchmark/benchmark_model"
                             (string-append #$output "/bin"))))
+          (add-after 'install-extra 'install-python
+            (lambda* (#:key inputs outputs #:allow-other-keys)
+              (with-directory-excursion
+                  "../lite/tools/pip_package/gen/tflite_pip/python3"
+                ((assoc-ref py:%standard-phases 'install)
+                 #:inputs inputs
+                 #:outputs `(("out" . ,#$output:python))))))
           (replace 'check
             (lambda* (#:key tests? #:allow-other-keys)
               (when tests?
-                (invoke "ctest" "-L" "plain")))))))
+                (invoke "ctest" "-L" "plain"))))
+          (add-after 'install-python 'add-install-to-pythonpath
+            (lambda* (#:key inputs #:allow-other-keys)
+              ((assoc-ref py:%standard-phases 'add-install-to-pythonpath)
+               #:inputs inputs
+               #:outputs `(("out" . ,#$output:python)))))
+          (add-after 'add-install-to-pythonpath 'python-sanity-check
+            (lambda* (#:key tests? inputs #:allow-other-keys)
+              ((assoc-ref py:%standard-phases 'sanity-check)
+               #:inputs `(("sanity-check.py" . ,#$(default-sanity-check.py))
+                          ,@inputs)
+               #:outputs `(("out" . ,#$output:python))))))))
     (inputs
      (list abseil-cpp
            cpuinfo
@@ -3353,15 +3386,21 @@ find_library(ML_DTYPES_LIBRARIES
            opencl-headers
            opencl-icd-loader
            pthreadpool
-           python
+           python-wrapper
            python-ml-dtypes
            ruy
            re2
            xnnpack
-           vulkan-headers))
+           vulkan-headers
+           zlib))
+    (propagated-inputs
+     (list python-numpy))
     (native-inputs
      `(("pkg-config" ,pkg-config)
        ("googletest" ,googletest)
+       ("pybind11" ,pybind11)
+       ("python-wheel" ,python-wheel)
+       ("swig" ,swig)
        ("farmhash-src"
         ,(let ((commit "816a4ae622e964763ca0862d9dbd19324a1eaf45"))
            (origin