Add ephemeral cache to mapping

src/ontogpt/engines/knowledge_engine.py

@@ -106,6 +106,9 @@ class KnowledgeEngine(ABC):
     mappers: Optional[List[BasicOntologyInterface]] = None
     """List of concept mappers, to assist in grounding to desired ID prefix"""
 
+    map_cache: Dict[str, str] = field(default_factory=dict)
+    """Cache of mappings obtained using the specified mappers."""
+
     labelers: Optional[List[BasicOntologyInterface]] = None
     """Labelers that map CURIEs to labels"""
 
@@ -395,6 +398,12 @@ def map_identifier(self, input_id: str, cls: ClassDefinition) -> Iterator[str]:
         :param cls:
         :return:
         """
+        if input_id not in self.map_cache:
+            self.map_cache[input_id] = []
+        else:
+            for obj_id in self.map_cache[input_id]:
+                yield obj_id
+
         try:
             if input_id.startswith("http://purl.bioontology.org/ontology"):
                 # TODO: this should be fixed upstream in OAK
@@ -416,6 +425,7 @@ def map_identifier(self, input_id: str, cls: ClassDefinition) -> Iterator[str]:
             for mapper in self.mappers:
                 if isinstance(mapper, MappingProviderInterface):
                     for mapping in mapper.sssom_mappings([input_id]):
+                        self.map_cache[input_id].append(str(mapping.object_id))
                         yield str(mapping.object_id)
                 else:
                     raise ValueError(f"Unknown mapper type {mapper}")