added group commutator tests

```
qiboteam · Apr 25, 2024 · 6a41ccf · 6a41ccf
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diff --git a/examples/dbi/dbi_cost_functions_and_d_gradients_tutorial.ipynb b/examples/dbi/dbi_cost_functions_and_d_gradients_tutorial.ipynb
diff --git a/examples/dbi/dbi_group_commutator_tests.ipynb b/examples/dbi/dbi_group_commutator_tests.ipynb
diff --git a/examples/dbi/dbi_misc.ipynb b/examples/dbi/dbi_misc.ipynb
diff --git a/src/qibo/models/dbi/double_bracket.py b/src/qibo/models/dbi/double_bracket.py
@@ -154,7 +154,7 @@ def backend(self):
 
     def least_squares(self, d: np.array):
         """Least squares cost function. (without the constant term norm(H))"""
-        h_np = np.diag(np.diag(self.backend.to_numpy(self.h.matrix)))
+        h_np = self.backend.to_numpy(self.h.matrix)
 
         return np.real(0.5 * np.linalg.norm(d) ** 2 - np.trace(h_np @ d))