hooks: move sklearn hook to a submodule

cx_Freeze/hooks/__init__.py

@@ -466,22 +466,6 @@ def load_sentry(finder: ModuleFinder, module: Module) -> None:
     finder.include_module("sentry_sdk.integrations.threading")
 
 
-def load_sklearn__distributor_init(
-    finder: ModuleFinder, module: Module
-) -> None:
-    """On Windows the sklearn/.libs directory is not copied."""
-    source_dir = module.parent.path[0] / ".libs"
-    if source_dir.exists():
-        # msvcp140 and vcomp140 dlls should be copied
-        finder.include_files(source_dir, "lib")
-        # patch the code to search the correct directory
-        code_string = module.file.read_text(encoding="utf-8")
-        code_string = code_string.replace(
-            "libs_path =", "libs_path = __import__('sys').frozen_dir  #"
-        )
-        module.code = compile(code_string, os.fspath(module.file), "exec")
-
-
 def load_setuptools(finder: ModuleFinder, module: Module) -> None:
     """The setuptools must be loaded as a package, to prevent it to break in
     the future.

cx_Freeze/hooks/sklearn.py

@@ -0,0 +1,26 @@
+"""A collection of functions which are triggered automatically by finder when
+scipy package is included.
+"""
+
+from __future__ import annotations
+
+import os
+
+from ..finder import ModuleFinder
+from ..module import Module
+
+
+def load_sklearn__distributor_init(
+    finder: ModuleFinder, module: Module
+) -> None:
+    """Fix the location of dependent files in Windows."""
+    source_dir = module.parent.path[0] / ".libs"
+    if source_dir.exists():
+        # msvcp140 and vcomp140 dlls should be copied
+        finder.include_files(source_dir, "lib")
+        # patch the code to search the correct directory
+        code_string = module.file.read_text(encoding="utf-8")
+        code_string = code_string.replace(
+            "libs_path =", "libs_path = __import__('sys').frozen_dir  #"
+        )
+        module.code = compile(code_string, os.fspath(module.file), "exec")