Primal: Refactoring

miplearn/components/primal.py

@@ -26,7 +26,13 @@ from miplearn.components import classifier_evaluation_dict
 from miplearn.components.component import Component
 from miplearn.extractors import InstanceIterator
 from miplearn.instance import Instance
-from miplearn.types import TrainingSample, VarIndex, Solution, LearningSolveStats
+from miplearn.types import (
+    TrainingSample,
+    VarIndex,
+    Solution,
+    LearningSolveStats,
+    Features,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -126,7 +132,7 @@ class PrimalSolutionComponent(Component):
                 solution[var_name][idx] = None
 
         # Compute y_pred
-        x = self.x_sample(instance, sample)
+        x = self.x_sample(instance.features, sample)
         y_pred = {}
         for category in x.keys():
             assert category in self.classifiers, (
@@ -213,34 +219,41 @@ class PrimalSolutionComponent(Component):
         assert sample["Solution"] is not None
         return cast(
             Tuple[Dict, Dict],
-            PrimalSolutionComponent._extract(
-                instance,
-                sample,
-                sample["Solution"],
-            ),
+            PrimalSolutionComponent._extract(instance.features, sample),
         )
 
     @staticmethod
     def x_sample(
-        instance: Any,
+        features: Features,
         sample: TrainingSample,
     ) -> Dict:
-        return cast(Dict, PrimalSolutionComponent._extract(instance, sample))
+        return cast(Dict, PrimalSolutionComponent._extract(features, sample))
 
     @staticmethod
     def _extract(
-        instance: Any,
+        features: Features,
         sample: TrainingSample,
-        solution: Optional[Dict] = None,
     ) -> Union[Dict, Tuple[Dict, Dict]]:
         x: Dict = {}
         y: Dict = {}
-        opt_value = 0.0
-        for (var_name, var_dict) in instance.features["Variables"].items():
+        solution: Optional[Solution] = None
+        if "Solution" in sample and sample["Solution"] is not None:
+            solution = sample["Solution"]
+        for (var_name, var_dict) in features["Variables"].items():
             for (idx, var_features) in var_dict.items():
                 category = var_features["Category"]
                 if category is None:
                     continue
+                if category not in x.keys():
+                    x[category] = []
+                    y[category] = []
+                f = var_features["User features"]
+                assert f is not None
+                if "LP solution" in sample and sample["LP solution"] is not None:
+                    lp_value = sample["LP solution"][var_name][idx]
+                    if lp_value is not None:
+                        f += [lp_value]
+                x[category] += [f]
                 if solution is not None:
                     opt_value = solution[var_name][idx]
                     assert opt_value is not None
@@ -250,16 +263,6 @@ class PrimalSolutionComponent(Component):
                         "variables is not currently supported. Please set its "
                         "category to None."
                     )
-                if category not in x.keys():
-                    x[category] = []
-                    y[category] = []
-                features = var_features["User features"]
-                if "LP solution" in sample and sample["LP solution"] is not None:
-                    lp_value = sample["LP solution"][var_name][idx]
-                    if lp_value is not None:
-                        features += [sample["LP solution"][var_name][idx]]
-                x[category] += [features]
-                if solution is not None:
                     y[category] += [[opt_value < 0.5, opt_value >= 0.5]]
         if solution is not None:
             return x, y

miplearn/features.py

@@ -6,7 +6,7 @@ import numbers
 import collections
 from typing import TYPE_CHECKING, Dict
 
-from miplearn.types import ModelFeatures, ConstraintFeatures
+from miplearn.types import Features, ConstraintFeatures
 
 if TYPE_CHECKING:
     from miplearn import InternalSolver, Instance
@@ -19,7 +19,7 @@ class FeaturesExtractor:
     ) -> None:
         self.solver = internal_solver
 
-    def extract(self, instance: "Instance") -> ModelFeatures:
+    def extract(self, instance: "Instance") -> Features:
         return {
             "Constraints": self._extract_constraints(instance),
             "Variables": self._extract_variables(instance),

miplearn/instance.py

@@ -9,7 +9,7 @@ from typing import Any, List, Optional, Hashable
 
 import numpy as np
 
-from miplearn.types import TrainingSample, VarIndex, ModelFeatures
+from miplearn.types import TrainingSample, VarIndex, Features
 
 
 # noinspection PyMethodMayBeStatic
@@ -27,7 +27,7 @@ class Instance(ABC):
 
     def __init__(self) -> None:
         self.training_data: List[TrainingSample] = []
-        self.features: ModelFeatures = {}
+        self.features: Features = {}
 
     @abstractmethod
     def to_model(self) -> Any:

miplearn/types.py

@@ -94,8 +94,8 @@ ConstraintFeatures = TypedDict(
     total=False,
 )
 
-ModelFeatures = TypedDict(
-    "ModelFeatures",
+Features = TypedDict(
+    "Features",
     {
         "Variables": Dict[str, Dict[VarIndex, VariableFeatures]],
         "Constraints": Dict[str, ConstraintFeatures],