diff --git a/to_ids.py b/to_ids.py
index 1726624..6cdea2d 100644
--- a/to_ids.py
+++ b/to_ids.py
@@ -1,5 +1,41 @@
 from tokenizer import BpeTokenizer
+from tqdm import tqdm
+from typing import List
+import pickle as pkl
+import torch
+import os
+
+def fetch_files(directory):
+    return [os.path.join(root, f) for root, _, files in os.walk(directory) for f in files]
+
+def convert_to_ids(tokenizer: BpeTokenizer, file_path, out_file_path):
+    arrows = []
+    with open(file_path, "r") as f:
+        for line in f:
+            ids = tokenizer.encode(line)
+            arrows.append(ids)
+    
+    with open(out_file_path, "w") as f:
+        tensor = torch.tensor(arrows, dtype=torch.int32)
+        pkl.dump(tensor, f)
+        
+def process_files(tokenizer: BpeTokenizer, files: List[str], base_out_dir):
+    for file_path in tqdm(files, desc="Processing files", total=len(files)):
+        out_file_name = os.path.basename(file_path).replace(".jsonl", ".pkl")
+        out_file_path = os.path.join(base_out_dir, out_file_name)
+        convert_to_ids(tokenizer, file_path, out_file_path)
 
 
 if __name__ == "__main__":
-    tokenzier = BpeTokenizer("tokenizer.json")
+    tokenizer = BpeTokenizer("tokenizer.json")
+    base_dir = [
+        os.path.join("dataset", "chinese-c4"),
+        os.path.join("dataset", "english-fineweb")
+    ]
+    base_out_dir = "cache"
+    
+    files = []
+    for dir_path in base_dir:
+        files.extend(fetch_files(dir_path))
+    
+    process_files(tokenizer, files, base_out_dir)
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