findPositiveSamples() output no data, in p2ch10 (kaggle)

[katychou]

p2ch10_explore_data.ipynb on kaggle
dataset :https://www.kaggle.com/datasets/avc0706/luna16

1.The program executes to line1 np.histogram(diameter_list) ouput is all ok ,

2.mhd_list = glob.glob('/kaggle/input/luna16/subset*/subset*/*.mhd') ouput many mhd files, is ok

3.series_uid='1.3.6.1.4.1.14519.5.2.1.6279.6001.137763212752154081977261297097'
a = glob.glob('/kaggle/input/luna16/subset0/subset0/{}.mhd'.format(series_uid))[0]
a
output:'/kaggle/input/luna16/subset0/subset0/1.3.6.1.4.1.14519.5.2.1.6279.6001.137763212752154081977261297097.mhd' , is ok

but,
run positiveSample_list = findPositiveSamples() ,just init, ouput no data
findPositiveSamples() ,output:[]