[fix] revert reward update and evaluation (#6295)

* Revert "rewrite reward fn"

This reverts commit d06042b434.

* Revert "upgrade reward math verification"

This reverts commit a6085ff676.

* Revert "fix bug"

This reverts commit 01640ebd65.

* Revert "reuse comm-group"

This reverts commit bd61918dcf.

* Revert "Support evaluation during training"

This reverts commit 57a88395fe.

applications/ColossalChat/coati/distributed/utils.py

@@ -1,10 +1,7 @@
-import json
-import os
 from collections import defaultdict
 from typing import Any, Dict, List
 
 import torch
-from filelock import FileLock
 
 from colossalai.shardformer.layer.loss import dist_log_prob
 
@@ -155,13 +152,3 @@ def masked_sum(tensor: torch.Tensor, mask: torch.Tensor, dim: int = 1) -> torch.
     """
     tensor = tensor * mask
     return tensor.sum(dim=dim)
-
-
-def safe_write_jsonl(file_path, data):
-    with FileLock(file_path + ".lock"):
-        # Ensure file exists
-        os.makedirs(os.path.dirname(file_path), exist_ok=True)
-        with open(file_path, "a", encoding="utf8") as f:
-            for entry in data:
-                json_line = json.dumps(entry, ensure_ascii=False)
-                f.write(json_line + "\n")