text: from typing import Optional
  
  from cachetools import LRUCache
  from snorkel.types import DataPoint
  
  from bohr.collection.artifacts.commit import Commit
  from bohr.datamodel.artifact import Artifact
  from bohr.datamodel.artifactmapper import ArtifactMapper
  
  
  class CommitMapper(ArtifactMapper):
      def __init__(self):
          super().__init__(Commit, "commit_id")
  
      cache = LRUCache(512)
  
      def map(self, x: DataPoint) -> Optional[Artifact]:
          return Commit(x.owner, x.repository, x.sha, str(x.message))
  