Remove outdated folding functions in mitiq

examples/15_Zero_Noise_Extrapolation.ipynb

@@ -336,7 +336,7 @@
     "Available options to set up the ZNE with `set_error_mitigation_properties`:\n",
     "\n",
     "- **factory**: The name of the zero-noise extrapolation method. Supported values: \"Richardson\", \"Linear\", \"Poly\", \"Exp\", \"PolyExp\", \"AdaExp\", \"FakeNodes\".\n",
-    "- **scaling**: The name of the function for scaling the noise of a quantum circuit. Supported values: \"fold_gates_at_random\", \"fold_gates_from_right\", \"fold_gates_from_left\".\n",
+    "- **scaling**: The name of the function for scaling the noise of a quantum circuit. Supported values: \"fold_gates_at_random\" (\"fold_gates_from_right\", \"fold_gates_from_left\" not supported as version 0.8).\n",
     "- **scale_factors**: List[int] Sequence of noise scale factors at which expectation values should be measured. For factory = \"AdaExp\", just the first element of the list will be considered.\n",
     "- **order**: Extrapolation order (degree of the polynomial fit). It cannot exceed len(scale_factors) - 1. Only used for factory = \"Poly\" or \"PolyExp\".\n",
     "- **steps**: The number of optimization steps. At least 3 are necessary. Only used for factory = \"AdaExp\"."

src/openqaoa-core/openqaoa/algorithms/baseworkflow.py

@@ -283,7 +283,7 @@ def set_error_mitigation_properties(self, **kwargs):
             factory: str
                 Used in "mitiq_zne". The name of the zero-noise extrapolation method. Supported values: "Richardson", "Linear", "Poly", "Exp", "PolyExp", "AdaExp", "FakeNodes".
             scaling: str
-                Used in "mitiq_zne". The name of the function for scaling the noise of a quantum circuit. Supported values: "fold_gates_at_random", "fold_gates_from_right", "fold_gates_from_left".
+                Used in "mitiq_zne". The name of the function for scaling the noise of a quantum circuit. Supported values: "fold_gates_at_random" ("fold_gates_from_right", "fold_gates_from_left" not supported as version 0.8)
             scale_factors: List[int]
                 Used in "mitiq_zne". Sequence of noise scale factors at which expectation values should be measured.
                 For factory = "AdaExp", just the first element of the list will be considered.

src/openqaoa-core/openqaoa/algorithms/workflow_properties.py

@@ -354,7 +354,7 @@ class MitiqZNEProperties(ErrorMitigationProperties):
     factory: str
         The name of the zero-noise extrapolation method. Supported values: "Richardson", "Linear", "Poly", "Exp", "PolyExp", "AdaExp", "FakeNodes".
     scaling: str
-        The name of the function for scaling the noise of a quantum circuit. Supported values: "fold_gates_at_random", "fold_gates_from_right", "fold_gates_from_left".
+        The name of the function for scaling the noise of a quantum circuit. Supported values: "fold_gates_at_random" ("fold_gates_from_right", "fold_gates_from_left" not supported as version 0.8).
     scale_factors: List[int]
         Sequence of noise scale factors at which expectation values should be measured.
         For factory = "AdaExp", just the first element of the list will be considered.

src/openqaoa-core/openqaoa/backends/wrapper.py

@@ -3,7 +3,7 @@
 import json
 
 from mitiq.zne.inference import RichardsonFactory, LinearFactory, PolyExpFactory, PolyFactory, AdaExpFactory, FakeNodesFactory, ExpFactory
-from mitiq.zne.scaling import fold_gates_at_random, fold_gates_from_left, fold_gates_from_right
+from mitiq.zne.scaling import fold_gates_at_random
 from mitiq.zne import execute_with_zne
 
 import copy
@@ -75,8 +75,6 @@ def exact_solution(self, *args, **kwargs):
 ]
 available_scaling = [
     "fold_gates_at_random",
-    "fold_gates_from_right",
-    "fold_gates_from_left"
 ]
 class ZNEWrapper(BaseWrapper):
     """
@@ -92,7 +90,7 @@ class ZNEWrapper(BaseWrapper):
     factory: str
         The name of the zero-noise extrapolation method. Supported values: "Richardson", "Linear", "Poly", "Exp", "PolyExp", "AdaExp", "FakeNodes".
     scaling: str
-        The name of the function for scaling the noise of a quantum circuit. Supported values: "fold_gates_at_random", "fold_gates_from_right", "fold_gates_from_left".
+        The name of the function for scaling the noise of a quantum circuit. Supported values: "fold_gates_at_random" ("fold_gates_from_right", "fold_gates_from_left" not supported as version 0.8).
     scale_factors: List[int]
         Sequence of noise scale factors at which expectation values should be measured.
         For factory = "AdaExp", just the first element of the list will be considered.
@@ -116,7 +114,7 @@ def __init__(self, backend, factory, scaling, scale_factors, order, steps):
         if(factory not in available_factories):
             raise ValueError("Supported factories are: Poly, Richardson, Exp, FakeNodes, Linear, PolyExp, AdaExp")
         if(scaling not in available_scaling):
-            raise ValueError("Supported scaling methods are: fold_gates_at_random, fold_gates_from_right, fold_gates_from_left")
+            raise ValueError("Supported scaling methods are: fold_gates_at_random")
         if(not isinstance(scale_factors, list) or not all(isinstance(x, int) and x >= 1 for x in scale_factors)): 
             raise ValueError("Scale factor must be a list of ints greater than or equal to 1") 
         if(type(order) != int or order < 1):
@@ -145,10 +143,10 @@ def __init__(self, backend, factory, scaling, scale_factors, order, steps):
         self.scale_noise = None
         if scaling == "fold_gates_at_random":
             self.scale_noise = fold_gates_at_random
-        elif scaling == "fold_gates_from_left":
-            self.scale_noise = fold_gates_from_left
-        elif scaling == "fold_gates_from_right":
-            self.scale_noise = fold_gates_from_right
+        # elif scaling == "fold_gates_from_left":
+        #     self.scale_noise = fold_gates_from_left
+        # elif scaling == "fold_gates_from_right":
+        #     self.scale_noise = fold_gates_from_right
 
         #setting the scale_factors 
         self.scale_factors = scale_factors