diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b1e275c..83662d9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -45,7 +45,7 @@ jobs:
         pre-build-command: |
           apt-get --allow-releaseinfo-change update -y && apt-get install -y git && git --version
           python -m pip install --upgrade pip setuptools wheel
-          python -m pip install -e .[composable,docs]
+          python -m pip install -e .[composable,neural,docs]
         docs-folder: "docs/"
     - name: Publish documentation
       run: |
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 9d86c63..702463c 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -36,6 +36,7 @@ extensions = [
     'sphinx.ext.autosummary',
     'sphinx.ext.viewcode',
     'sphinx.ext.napoleon',
+    'sphinx.ext.intersphinx',
     'myst_parser',
 ]
 
@@ -55,6 +56,10 @@ exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
 html_theme = 'sphinx_rtd_theme'
 # html_theme = 'furo'
 # need to be installed: pip install furo (not working...)
-html_static_path = ['_static']
+# html_static_path = ['_static']
 
+# intersphinx configuration
+intersphinx_mapping = {
+    "sklearn": ("https://scikit-learn.org/stable/", None),
+}
 
diff --git a/docs/source/quapy.method.rst b/docs/source/quapy.method.rst
index 31a357a..ac0dfc8 100644
--- a/docs/source/quapy.method.rst
+++ b/docs/source/quapy.method.rst
@@ -53,7 +53,7 @@ quapy.method.non\_aggregative module
    :show-inheritance:
 
 quapy.method.composable module
-------------------------
+------------------------------
 
 .. automodule:: quapy.method.composable
    :members:
diff --git a/setup.py b/setup.py
index 23aa3ca..aa699e4 100644
--- a/setup.py
+++ b/setup.py
@@ -126,6 +126,7 @@ setup(
     extras_require={  # Optional
        'bayes': ['jax', 'jaxlib', 'numpyro'],
        'composable': ['qunfold @ git+https://github.com/mirkobunse/qunfold@v0.1.3'],
+       'neural': ['torch'],
        'tests': ['certifi'],
        'docs' : ['sphinx-rtd-theme', 'myst-parser'],
     },