diff --git a/onnxmltools/convert/libsvm/__init__.py b/onnxmltools/convert/libsvm/__init__.py
index 11db0855..b4571a32 100644
--- a/onnxmltools/convert/libsvm/__init__.py
+++ b/onnxmltools/convert/libsvm/__init__.py
@@ -1,3 +1,4 @@
 # SPDX-License-Identifier: Apache-2.0
 
+from . import operators_converters, shape_calculators
 from .convert import convert