Update tokenization_qwen.py

Download font ttf file if not exists

tokenization_qwen.py

@@ -25,6 +25,11 @@ from matplotlib.font_manager import FontProperties
 
 logger = logging.getLogger(__name__)
 
+if not os.path.exists("SimSun.ttf"):
+    # download if not exists
+    logger.warning("SimSun font is required for Chinese display. Start downloading...")
+    print("wget https://ofasys-wlcb.oss-cn-wulanchabu.aliyuncs.com/Qwen-VL/SimSun.ttf")
+    os.system("wget https://ofasys-wlcb.oss-cn-wulanchabu.aliyuncs.com/Qwen-VL/SimSun.ttf")
 
 VOCAB_FILES_NAMES = {"vocab_file": "qwen.tiktoken", "ttf": "SimSun.ttf"}