|-data
   |---sensor_A
   |-----1.dat
   |-----2.dat
   |-----3.dat
   |---sensor_B
   |-----1.dat
   |-----2.dat
   |-----3.dat

tensorflow.python.framework.errors_impl.NotFoundError: NewRandomAccessFile failed to Create/Open: mock_datasensor_A1.dat : The system cannot find the file specified.
; No such file or directory
     [[{{node ReadFile}}]] [Op:IteratorGetNextSync]

for el in dataset: