[sphinx] Fixed warning

doc/conf.py

@@ -239,7 +239,7 @@ autodoc_default_flags = [
 from bob.extension.utils import link_documentation, load_requirements
 sphinx_requirements = "extra-intersphinx.txt"
 if os.path.exists(sphinx_requirements):
-    intersphinx_mapping = link_documentation(additional_packages=load_requirements(sphinx_requirements))
+    intersphinx_mapping = link_documentation(['python', 'numpy'] + additional_packages=load_requirements(sphinx_requirements))
 else:
     intersphinx_mapping = link_documentation()