diff --git a/lang/fr/gklearn/preimage/__init__.py b/lang/fr/gklearn/preimage/__init__.py
new file mode 100644
index 0000000..a9284b2
--- /dev/null
+++ b/lang/fr/gklearn/preimage/__init__.py
@@ -0,0 +1,19 @@
+# -*-coding:utf-8 -*-
+"""gklearn - preimage module
+
+Implements pre-image method for graphs.
+
+"""
+
+# info
+__version__ = "0.1"
+__author__ = "Linlin Jia"
+__date__ = "March 2020"
+
+from gklearn.preimage.preimage_generator import PreimageGenerator
+from gklearn.preimage.random_preimage_generator import RandomPreimageGenerator
+from gklearn.preimage.median_preimage_generator import MedianPreimageGenerator
+from gklearn.preimage.median_preimage_generator_py import MedianPreimageGeneratorPy
+from gklearn.preimage.median_preimage_generator_cml import MedianPreimageGeneratorCML
+from gklearn.preimage.kernel_knn_cv import kernel_knn_cv
+from gklearn.preimage.generate_random_preimages_by_class import generate_random_preimages_by_class