train.py 195行 重复下载模型

train.py 第 195行，is_download_data = download_data(data_url, md5_url)
init_model 会反复下载模型，希望作者能解释一下为什么会有这样一个逻辑
我已经下载好所有模型，然后将该行注释掉，验证可以运行程序

Start by reading train.py around line 195 and trace the init_model and download_data calls. Check when the model files are considered present and when downloads are triggered. Done means the existing-model behavior is understood and the issue's expected download behavior is documented or verified.

Written by the indexing model from the issue text.