[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

src/qibotn/backends/__init__.py

@@ -1,2 +1,2 @@
-from qibotn.backends.gpu import CuTensorNet
 from qibotn.backends.cpu import QuTensorNet
+from qibotn.backends.gpu import CuTensorNet

src/qibotn/backends/cpu.py

@@ -1,8 +1,6 @@
-import numpy as np
-
 from qibo.backends.numpy import NumpyBackend
-from qibo.states import CircuitResult
 from qibo.config import raise_error
+from qibo.states import CircuitResult
 
 
 class QuTensorNet(NumpyBackend):
@@ -60,7 +58,6 @@ class QuTensorNet(NumpyBackend):
 
         Returns:
             xxx.
-
         """
 
         import qibotn.eval_qu as eval

src/qibotn/backends/gpu.py

@@ -1,8 +1,7 @@
 import numpy as np
-
 from qibo.backends.numpy import NumpyBackend
-from qibo.states import CircuitResult
 from qibo.config import raise_error
+from qibo.states import CircuitResult
 
 
 class CuTensorNet(NumpyBackend):  # pragma: no cover
@@ -107,7 +106,6 @@ class CuTensorNet(NumpyBackend):  # pragma: no cover
 
         Returns:
             xxx.
-
         """
 
         import qibotn.eval as eval