feat: enable initializing NativeGates from list[str]

src/qibo/backends/__init__.py

@@ -1,7 +1,5 @@
 import os
-from functools import reduce
 from importlib import import_module
-from operator import or_
 
 import networkx as nx
 import numpy as np
@@ -146,9 +144,6 @@ def _default_transpiler(cls):
             and natives is not None
             and connectivity_edges is not None
         ):
-            # natives_enum = NativeGates.from_gatelist(natives)
-            natives_enum = reduce(or_, [NativeGates[nat] for nat in natives])
-
             # only for q{i} naming
             node_mapping = {q: i for i, q in enumerate(qubits)}
             edges = [
@@ -162,7 +157,7 @@ def _default_transpiler(cls):
                     Preprocessing(connectivity),
                     Trivial(connectivity),
                     Sabre(connectivity),
-                    Unroller(natives_enum),
+                    Unroller(NativeGates[natives]),
                 ],
             )
 

src/qibo/transpiler/unroller.py

@@ -1,4 +1,6 @@
-from enum import Flag, auto
+from enum import EnumMeta, Flag, auto
+from functools import reduce
+from operator import or_
 
 from qibo import gates
 from qibo.backends import _check_backend
@@ -15,7 +17,14 @@
 )
 
 
-class NativeGates(Flag):
+class FlagMeta(EnumMeta):
+    def __getitem__(self, keys):
+        if isinstance(keys, str):
+            return super().__getitem__(keys)
+        return reduce(or_, [self[key] for key in keys])
+
+
+class NativeGates(Flag, metaclass=FlagMeta):
     """Define native gates supported by the unroller. A native gate set should contain at least
     one two-qubit gate (:class:`qibo.gates.gates.CZ` or :class:`qibo.gates.gates.iSWAP`),
     and at least one single-qubit gate

tests/test_transpiler_unroller.py

@@ -21,9 +21,14 @@ def test_native_gates_from_gatelist_fail():
         NativeGates.from_gatelist([gates.RZ, gates.X(0)])
 
 
-def test_native_gate_str_from_gatelist_fail():
-    with pytest.raises(ValueError):
-        NativeGates.from_gatelist(["qibo"])
+def test_native_gate_str_list():
+    testlist = ["I", "Z", "RZ", "M", "GPI2", "U3", "CZ", "iSWAP", "CNOT"]
+    natives = NativeGates[testlist]
+    for gate in testlist:
+        assert NativeGates[gate] in natives
+
+    with pytest.raises(KeyError):
+        NativeGates[["qi", "bo"]]  # Invalid gate names
 
 
 def test_translate_gate_error_1q():