diff --git a/examples/iwslt2012/punc0/preprocess.py b/examples/iwslt2012/punc0/preprocess.py
deleted file mode 100644
index c6645bdb..00000000
--- a/examples/iwslt2012/punc0/preprocess.py
+++ /dev/null
@@ -1,27 +0,0 @@
-import argparse
-import os
-
-def process_sentence(line):
-    if line == '': return ''
-    res = line[0]
-    for i in range(1, len(line)):
-        res += (' ' + line[i])
-    return res
-
-if __name__ == "__main__":
-    paser = argparse.ArgumentParser(description = "Input filename")
-    paser.add_argument('-input_file')
-    paser.add_argument('-output_file')
-    sentence_cnt = 0
-    args = paser.parse_args()
-    with open(args.input_file, 'r') as f:
-        with open(args.output_file, 'w') as write_f:
-            while True:
-                line = f.readline()
-                if line:
-                    sentence_cnt += 1 
-                    write_f.write(process_sentence(line))
-                else:
-                    break
-    print('preprocess over')
-    print('total sentences number:', sentence_cnt)