diff --git a/extra/union-gt-and-pred.py b/extra/union-gt-and-pred.py
new file mode 100644
index 000000000..40e39fb12
--- /dev/null
+++ b/extra/union-gt-and-pred.py
@@ -0,0 +1,57 @@
+import sys
+import os
+import glob
+
+## This script ensures same number of files in ground-truth and predicted folder.
+## When you encounter file not found error, it's usually because you have
+## mismatched numbers of ground-truth and predicted files.
+## You can use this script to create missing files as empty file. The rationale 
+## behind is the following:
+##  - if a file is missing from the ground truth but is present among the 
+##    predictions it means that we have false positives
+##  - if a file is missing from the predictions but is present in the ground
+##    truth it means that we have a false negative
+
+# change directory to the one with the files to be changed
+path_to_gt = '../ground-truth'
+path_to_pred = '../predicted'
+
+os.chdir(path_to_gt)
+gt_files = glob.glob('*.txt')
+if len(gt_files) == 0:
+    print("Error: no .txt files found in", path_to_gt)
+    sys.exit()
+os.chdir(path_to_pred)
+pred_files = glob.glob('*.txt')
+if len(pred_files) == 0:
+    print("Error: no .txt files found in", path_to_pred)
+    sys.exit()
+
+gt_files = set(gt_files)
+pred_files = set(pred_files)
+print('total ground-truth files:', len(gt_files))
+print('total predicted files:', len(pred_files))
+
+gt_backup = gt_files - pred_files
+pred_backup = pred_files - gt_files
+
+def backup(src_folder, backup_files, dst_folder):
+    # non-intersection files (txt format) will be moved to a backup folder
+    if not backup_files:
+        print('No missing file in', dst_folder)
+        return
+    os.chdir(src_folder)
+    ## create the backup dir if it doesn't exist already
+    for file in backup_files:
+        open(dst_folder + '/' + file, 'w').close()
+    
+backup(path_to_gt, gt_backup, path_to_pred)
+backup(path_to_pred, pred_backup, path_to_gt)
+if gt_backup:
+    print('total predicted added files:', len(gt_backup))
+if pred_backup:
+    print('total ground-truth added files:', len(pred_backup))
+
+union = gt_files | pred_files
+print('total union files:', len(union))
+print("Union completed!")
diff --git a/main.py b/main.py
index 60188f15d..b7c2eb47c 100644
--- a/main.py
+++ b/main.py
@@ -845,7 +845,7 @@ def draw_plot_func(dictionary, n_classes, window_title, plot_title, x_label, out
     plot_title = "mAP = {0:.2f}%".format(mAP*100)
     x_label = "Average Precision"
     output_path = results_files_path + "/mAP.png"
-    to_show = True
+    to_show = False
     plot_color = 'royalblue'
     draw_plot_func(
         ap_dictionary,