Fix import package issues

video_prediction_tools/main_scripts/main_meta_postprocess.py

@@ -10,14 +10,13 @@ __email__ = "b.gong@fz-juelich.de"
 __author__ = "Bing Gong, Yan Ji"
 __date__ = "2020-12-04"
 __update_date__ = "2022-02-02"
-
+import os
 from matplotlib.pylab import plt
 import json
 import numpy as np
 import shutil
 import glob
 from netCDF4 import Dataset
-from  model_modules.video_prediction.metrics import *
 import xarray as xr