Add jugs curriculum (#369)

reasoning_gym/algorithmic/jugs.py

@@ -6,6 +6,7 @@ from functools import reduce
 from random import Random
 from typing import Any, Optional
 
+from ..coaching import AttributeType, BaseCurriculum, ScalarAttributeDefinition
 from ..factory import ProceduralDataset, register_dataset
 
 
@@ -280,7 +281,13 @@ Reply as a JSON-parsable list of moves which result in any of the jugs being fil
         return {
             "question": question,
             "answer": json.dumps(solution),  # one possible solution
-            "metadata": {"puzzle": puzzle},
+            "metadata": {
+                "puzzle": puzzle,
+                "difficulty": {
+                    "num_jugs": self.config.num_jugs,
+                    "difficulty": self.config.difficulty,
+                },
+            },
         }
 
     def score_answer(self, answer: Optional[str], entry: dict[str, Any]) -> float:
@@ -310,4 +317,33 @@ Reply as a JSON-parsable list of moves which result in any of the jugs being fil
             return 0.0
 
 
-register_dataset("jugs", JugsDataset, JugsConfig)
+class JugsCurriculum(BaseCurriculum):
+    """Curriculum for Jugs puzzles"""
+
+    def __init__(self):
+        super().__init__(JugsCurriculum.__name__, JugsConfig)
+
+        # Define attributes
+        self._define_attributes(
+            ScalarAttributeDefinition(
+                name="num_jugs",
+                field_name="num_jugs",
+                levels=[3, 4, 5, 7],
+                default_level=0,
+                description="Number of jugs in the puzzle",
+                attr_type=AttributeType.STATIC,
+                min_value=3,
+            ),
+            ScalarAttributeDefinition(
+                name="difficulty",
+                field_name="difficulty",
+                levels=[2, 4, 6, 8],
+                default_level=0,
+                description="Minimum required moves to solve the puzzle",
+                attr_type=AttributeType.STATIC,
+                min_value=10,
+            ),
+        )
+
+
+register_dataset("jugs", JugsDataset, JugsConfig, JugsCurriculum)