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diff --git a/ot/gpu/__init__.py b/ot/gpu/__init__.py
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+++ b/ot/gpu/__init__.py
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+# -*- coding: utf-8 -*-
+"""
+
+This module provides GPU implementation for several OT solvers and utility 
+functions. The GPU backend in handled by `cupy 
+<https://cupy.chainer.org/>`_.
+
+.. warning::
+    Note that by default the module is not import in :mod:`ot`. In order to 
+    use it you need to explicitely import :mod:`ot.gpu` .
+
+By default, the functions in this module accept and return numpy arrays 
+in order to proide drop-in replacement for the other POT function but
+the transfer between CPU en GPU comes with a significant overhead.
+
+In order to get the best performances, we recommend to give only cupy 
+arrays to the functions and desactivate the conversion to numpy of the 
+result of the function with parameter ``to_numpy=False``.
+
+"""
+
+# Author: Remi Flamary <remi.flamary@unice.fr>
+#         Leo Gautheron <https://github.com/aje>
+#
+# License: MIT License
+
+from . import bregman
+from . import da
+from .bregman import sinkhorn
+from .da import sinkhorn_lpl1_mm
+
+from . import utils
+from .utils import dist, to_gpu, to_np
+
+
+
+
+
+__all__ = ["utils", "dist", "sinkhorn",
+           "sinkhorn_lpl1_mm", 'bregman', 'da', 'to_gpu', 'to_np']
+