Could you share the weight file which in(/home/fenglf/PycharmProjects/keras-finetuning-master/model/pretrained/)

[KeuntekLee]

there are some weight files need to run code
/home/fenglf/PycharmProjects/keras-finetuning-master/model/pretrained/
please share h5 file in above path

[fenglf]

it just comes from imagenet.
replace "base_model_name(weights=pretrained_model_dir, include_top=False)"
with "base_model_name(weights='imagenet', include_top=False)"
should solve.