fix: change the order or the inheritance to impose the correct __mro__

src/qibotn/backends/abstract.py

@@ -20,10 +20,16 @@ class QibotnBackend(ABC):
     def set_precision(self, precision):
         if precision != self.precision:
             super().set_precision(precision)
+        self._setup_backend_specifics()
 
     def set_device(self, device):
         self.device = device
+        self._setup_backend_specifics()
 
     def configure_tn_simulation(self, **config):
         """Configure the TN simulation that will be performed."""
         pass
+
+    def _setup_backend_specifics(self):
+        """Configure the backend specific according to the used package."""
+        pass

src/qibotn/backends/cutensornet.py

@@ -8,7 +8,7 @@ from qibotn.backends.abstract import QibotnBackend
 CUDA_TYPES = {}
 
 
-class CuTensorNet(NumpyBackend, QibotnBackend):  # pragma: no cover
+class CuTensorNet(QibotnBackend, NumpyBackend):  # pragma: no cover
     # CI does not test for GPU
     """Creates CuQuantum backend for QiboTN."""
 

src/qibotn/backends/qmatchatea.py

@@ -15,7 +15,7 @@ from qibotn.result import TensorNetworkResult
 
 
 @dataclass
-class QMatchaTeaBackend(NumpyBackend, QibotnBackend):
+class QMatchaTeaBackend(QibotnBackend, NumpyBackend):
 
     def __init__(self):
         super().__init__()
@@ -25,9 +25,7 @@ class QMatchaTeaBackend(NumpyBackend, QibotnBackend):
 
         # Set default configurations
         self.configure_tn_simulation()
-        # TODO: update this function whenever ``set_device`` and ``set_precision``
+        self._setup_backend_specifics()
-        # are set (?)
-        self._setup_qmatchatea_backend()
 
     def configure_tn_simulation(
         self,
@@ -52,7 +50,7 @@ class QMatchaTeaBackend(NumpyBackend, QibotnBackend):
         )
         self.ansatz = ansatz
 
-    def _setup_qmatchatea_backend(self):
+    def _setup_backend_specifics(self):
         """Configure qmatchatea QCBackend object."""
 
         qmatchatea_device = (

src/qibotn/backends/quimb.py

@@ -5,7 +5,7 @@ from qibo.result import QuantumState
 from qibotn.backends.abstract import QibotnBackend
 
 
-class QuimbBackend(NumpyBackend, QibotnBackend):
+class QuimbBackend(QibotnBackend, NumpyBackend):
 
     def __init__(self, runcard):
         super().__init__()