add scikit-learn recipe and dependencies

Author: mzakharo

ci/constants.py

@@ -27,7 +27,7 @@ class TargetPython(Enum):
     'sympy',
     'vlc',
     # need extra gfortran NDK system add-on
-    'lapack', 'scipy',
+    'lapack', 'scipy', 'scikit-learn',
     # Outdated and there's a chance that is now useless.
     'zope_interface',
     # Requires zope_interface, which is broken.

pythonforandroid/recipes/joblib/__init__.py

@@ -0,0 +1,14 @@
+from pythonforandroid.recipe import PythonRecipe
+
+
+class ThisRecipe(PythonRecipe):
+    org = 'joblib'
+    name = 'joblib'
+    version = '0.17.0'
+    url = f'https://github.com/{org}/{name}/archive/{version}.zip'
+    depends = ['setuptools']
+    call_hostpython_via_targetpython = False
+    patches = ['multiprocessing.patch']
+
+
+recipe = ThisRecipe()

pythonforandroid/recipes/joblib/multiprocessing.patch

@@ -0,0 +1,32 @@
+diff --git a/joblib/externals/loky/backend/__init__.py b/joblib/externals/loky/backend/__init__.py
+index a65ce0e..9efdb46 100644
+--- a/joblib/externals/loky/backend/__init__.py
++++ b/joblib/externals/loky/backend/__init__.py
+@@ -10,7 +10,7 @@ if sys.version_info > (3, 4):
+         return name
+ 
+     # monkey patch the name creation for multiprocessing
+-    from multiprocessing import synchronize
+-    synchronize.SemLock._make_name = staticmethod(_make_name)
++    #from multiprocessing import synchronize
++    #synchronize.SemLock._make_name = staticmethod(_make_name)
+ 
+ __all__ = ["get_context"]
+diff --git a/joblib/externals/loky/backend/queues.py b/joblib/externals/loky/backend/queues.py
+index 62735db..156e235 100644
+--- a/joblib/externals/loky/backend/queues.py
++++ b/joblib/externals/loky/backend/queues.py
+@@ -9,6 +9,8 @@
+ # * Add some custom reducers for the Queues/SimpleQueue to tweak the
+ #   pickling process. (overload Queue._feed/SimpleQueue.put)
+ #
++from queue import Queue, SimpleQueue, Full
++'''
+ import os
+ import sys
+ import errno
+@@ -245,3 +247,4 @@ class SimpleQueue(mp_SimpleQueue):
+         else:
+             with self._wlock:
+                 self._writer.send_bytes(obj)
++'''

pythonforandroid/recipes/scikit-learn/__init__.py

@@ -0,0 +1,40 @@
+from pythonforandroid.recipe import CompiledComponentsPythonRecipe, Recipe
+from multiprocessing import cpu_count
+
+
+class ThisRecipe(CompiledComponentsPythonRecipe):
+
+    site_packages_name = 'scikit-learn'
+    version = '0.23.2'
+    url = f'https://github.com/{site_packages_name}/{site_packages_name}/archive/{version}.zip'
+    depends = ['setuptools', 'scipy', 'joblib', 'threadpoolctl']
+    call_hostpython_via_targetpython = False
+    need_stl_shared = True
+    patches = ['cross-compile.patch']
+
+    def build_compiled_components(self, arch):
+        self.setup_extra_args = ['-j', str(cpu_count())]
+        super().build_compiled_components(arch)
+        self.setup_extra_args = []
+
+    def rebuild_compiled_components(self, arch, env):
+        self.setup_extra_args = ['-j', str(cpu_count())]
+        super().rebuild_compiled_components(arch, env)
+        self.setup_extra_args = []
+
+    def strip_ccache(self, env):
+        for key, value in env.items():
+            parts = value.split(' ')
+            if 'ccache' in parts[0]:
+                env[key] = ' '.join(parts[1:])
+
+    def get_recipe_env(self, arch):
+        env = super().get_recipe_env(arch)
+        self.strip_ccache(env)
+        scipy_build_dir = Recipe.get_recipe('scipy', self.ctx).get_build_dir(arch.arch)
+        env['PYTHONPATH'] += f':{scipy_build_dir}'
+        env['CXX'] += f' -Wl,-l{self.stl_lib_name}'
+        return env
+
+
+recipe = ThisRecipe()

pythonforandroid/recipes/scikit-learn/cross-compile.patch

@@ -0,0 +1,30 @@
+diff --git a/setup.py b/setup.py
+index 90162b6..946af48 100755
+--- a/setup.py
++++ b/setup.py
+@@ -291,7 +291,7 @@ def setup_package():
+ 
+         check_package_status('numpy', NUMPY_MIN_VERSION)
+ 
+-        check_package_status('scipy', SCIPY_MIN_VERSION)
++        #check_package_status('scipy', SCIPY_MIN_VERSION)
+ 
+         from numpy.distutils.core import setup
+ 
+diff --git a/sklearn/_build_utils/pre_build_helpers.py b/sklearn/_build_utils/pre_build_helpers.py
+index bc3d832..fe1819e 100644
+--- a/sklearn/_build_utils/pre_build_helpers.py
++++ b/sklearn/_build_utils/pre_build_helpers.py
+@@ -48,8 +48,10 @@ def compile_test_program(code, extra_preargs=[], extra_postargs=[]):
+ 
+             # Run test program
+             # will raise a CalledProcessError if return code was non-zero
+-            output = subprocess.check_output('./test_program')
+-            output = output.decode(sys.stdout.encoding or 'utf-8').splitlines()
++            assert os.path.exists('./test_program')
++            output = ['nthreads=4'] * 4
++            #output = subprocess.check_output('./test_program')
++            #output = output.decode(sys.stdout.encoding or 'utf-8').splitlines()
+         except Exception:
+             raise
+         finally:

pythonforandroid/recipes/threadpoolctl/__init__.py

@@ -0,0 +1,14 @@
+from pythonforandroid.recipe import PythonRecipe
+
+
+class ThisRecipe(PythonRecipe):
+    org = 'joblib'
+    name = 'threadpoolctl'
+    version = '2.1.0'
+    url = f'https://github.com/{org}/{name}/archive/{version}.zip'
+    depends = ['setuptools']
+    call_hostpython_via_targetpython = False
+    patches = ['docstring.patch', 'setuptools.patch']
+
+
+recipe = ThisRecipe()

pythonforandroid/recipes/threadpoolctl/docstring.patch

@@ -0,0 +1,13 @@
+diff --git a/threadpoolctl.py b/threadpoolctl.py
+index b94d7a1..faf7a44 100644
+--- a/threadpoolctl.py
++++ b/threadpoolctl.py
+@@ -98,7 +98,7 @@ _ALL_OPENMP_LIBRARIES = list(
+ 
+ def _format_docstring(*args, **kwargs):
+     def decorator(o):
+-        o.__doc__ = o.__doc__.format(*args, **kwargs)
++        #o.__doc__ = o.__doc__.format(*args, **kwargs)
+         return o
+ 
+     return decorator

pythonforandroid/recipes/threadpoolctl/setuptools.patch

@@ -0,0 +1,15 @@
+diff --git a/setup.py b/setup.py
+new file mode 100755
+index 0000000..b18d2fd
+--- /dev/null
++++ b/setup.py
+@@ -0,0 +1,9 @@
++from setuptools import setup
++import threadpoolctl
++
++if __name__ == '__main__':
++    setup(name='threadpoolctl',
++          version=threadpoolctl.__version__,
++          py_modules = ['threadpoolctl'],
++          python_requires='>=3.6',
++          )