Repository: Marker-Inc-Korea/AutoRAG
Issue: [HotFIx] Resolve error at flag_embedding_run_model
Root cause: Algorithmic Error

```
                             │ /usr/local/lib/python3.10/dist-packages/autorag/nodes/passagereranker/fl │               
                             │ ag_embedding.py:38 in flag_embedding_reranker                            │               
                             │                                                                          │               
                             │   35 │   │   model_name_or_path=model_name, use_fp16=use_fp16            │               
                             │   36 │   )                                                               │               
                             │   37 │   nested_list = [list(map(lambda x: [query, x], content_list)) fo │               
                             │      in zip(queries, contents_list)]                                     │               
                             │ ❱ 38 │   rerank_scores = flatten_apply(flag_embedding_run_model, nested_ │               
                             │      batch_size=batch)                                                   │               
                             │   39 │                                                                   │               
                             │   40 │   df = pd.DataFrame({                                             │               
                             │   41 │   │   'contents': contents_list,                                  │               
                             │                                                                          │               
                             │ /usr/local/lib/python3.10/dist-packages/autorag/utils/util.py:335 in     │               
                             │ flatten_apply                                                            │               
                             │                                                                          │               
                             │   332 │   """                                                            │               
                             │   333 │   df = pd.DataFrame({'col1': nested_list})                       │               
                             │   334 │   df = df.explode('col1')                                        │               
                             │ ❱ 335 │   df['result'] = func(df['col1'].tolist(), **kwargs)             │               
                             │   336 │   return df.groupby(level=0, sort=False)['result'].apply(list).t │               
                             │   337                                                                    │               
                             │   338                                                                    │               
                             │                                                                          │               
                             │ /usr/local/lib/python3.10/dist-packages/autorag/nodes/passagereranker/fl │               
                             │ ag_embedding.py:64 in flag_embedding_run_model                           │               
                             │                                                                          │               
                             │   61 │   │   if batch_size == 1:                                         │               
                             │   62 │   │   │   results.append(pred_scores)                             │               
                             │   63 │   │   else:                                                       │               
                             │ ❱ 64 │   │   │   results.extend(pred_scores)                             │               
                             │   65 │   return results                                                  │               
                             │   66                                                                     │               
                             ╰──────────────────────────────────────────────────────────────────────────╯               
                             TypeError: 'float' object is not iterable 
```