Update conf.py

docs/conf.py

@@ -16,6 +16,18 @@
 import sys
 import os
 
+from unittest.mock import MagicMock
+
+class Mock(MagicMock):
+    @classmethod
+    def __getattr__(cls, name):
+            return MagicMock()
+
+MOCK_MODULES = ['lightgbm', 'xgboost','numpy', 'pandas']
+sys.modules.update((mod_name, Mock()) for mod_name in MOCK_MODULES)
+
+
+
 # If extensions (or modules to document with autodoc) are in another
 # directory, add these directories to sys.path here. If the directory is
 # relative to the documentation root, use os.path.abspath to make it