In case the commit is not found locally, try fetching from remote

Classifier/commit_features.py

@@ -43,7 +43,27 @@ class CommitFeatures:
             if self.repo.bare:
                 raise Exception(f'Found bare repository under "{self.repo_path}"!')
 
-            self.commit = self.repo.commit(self.commit_sha)
+            self.commit = self.get_commit_by_sha()
+
+    def get_commit_by_sha(self):
+        if not self.commit_sha:
+            return None
+
+        try:
+            commit = self.repo.commit(self.commit_sha)
+        except ValueError:
+            try:
+                # Assume orphaned commit, try fetching from origin
+                self.repo.git.fetch("origin", self.commit_sha)
+                commit = self.repo.commit(self.commit_sha)
+            except Exception:
+                # Does not exist or is not reachable
+                commit = None
+        except Exception:
+            # In case of any error, return None
+            commit = None
+
+        return commit
 
     def save_features_to_json(self, path):
         if not os.path.exists(path):