diff --git a/frontend/__init__.py b/frontend/__init__.py
index 4d67868..3940816 100644
--- a/frontend/__init__.py
+++ b/frontend/__init__.py
@@ -32,20 +32,23 @@ def normalize_and_colormap(img):
 
 
 def change_epoch():
-    global r
     epoch = input('Enter epoch number or "latest"\n')
     r = requests.post(f'{API_URL}/model/update/{epoch}')
     print(r.text)
 
 
-def extract_data(r):
+def extract_data(data):
     # FIXME yuck, don't json the json
-    data = json.loads(json.loads(r.text))
-    pred_disp = np.asarray(data['disp'], dtype='uint8')
+    duration = data['duration']
+
+    # get result and rotate 90 deg
+    pred_disp = cv2.transpose(np.asarray(data['disp'], dtype='uint8'))
+
+    if input not in data:
+        return pred_disp, duration
+
     in_img = np.asarray(data['input'], dtype='uint8').transpose((2, 0, 1))
     ref_pat = np.asarray(data['reference'], dtype='uint8').transpose((2, 0, 1))
-    duration = data['duration']
-    pred_disp = cv2.transpose(pred_disp)
     return pred_disp, in_img, ref_pat, duration
 
 
@@ -65,32 +68,34 @@ def put_image(img_path):
     r = requests.put(f'{API_URL}/ir', files=openBin)
     print('received response')
     r.raise_for_status()
-    return r
+    data = json.loads(json.loads(r.text))
+    return data
 
 
-while True:
-    for img in os.scandir(img_dir):
-        start = datetime.now()
-        if 'ir' not in img.path:
-            continue
+if __name__ == '__main__':
+    while True:
+        for img in os.scandir(img_dir):
+            start = datetime.now()
+            if 'ir' not in img.path:
+                continue
 
-        # alternatively: use img.path for native size
-        downsize_input_img()
+            # alternatively: use img.path for native size
+            downsize_input_img()
 
-        r = put_image('buffer.png')
-        pred_disp, in_img, ref_pat, duration = extract_data(r)
+            data = put_image('buffer.png')
+            pred_disp, in_img, ref_pat, duration = extract_data(data)
 
-        print(f'inference took {duration:1.4f}s')
-        print(f'pipeline and transfer took another {(datetime.now() - start).total_seconds() - float(duration):1.4f}s')
-        print(f"Pred. Disparity: \n\t{pred_disp.min():.{2}f}/{pred_disp.max():.{2}f}\n")
+            print(f'inference took {duration:1.4f}s')
+            print(f'pipeline and transfer took another {(datetime.now() - start).total_seconds() - float(duration):1.4f}s')
+            print(f"Pred. Disparity: \n\t{pred_disp.min():.{2}f}/{pred_disp.max():.{2}f}\n")
 
-        cv2.imshow('Input Image', in_img)
-        # cv2.imshow('Reference Image', ref_pat)
-        cv2.imshow('Normalized Predicted Disparity', normalize_and_colormap(pred_disp))
-        cv2.imshow('Predicted Disparity', pred_disp)
-        key = cv2.waitKey()
+            cv2.imshow('Input Image', in_img)
+            # cv2.imshow('Reference Image', ref_pat)
+            cv2.imshow('Normalized Predicted Disparity', normalize_and_colormap(pred_disp))
+            cv2.imshow('Predicted Disparity', pred_disp)
+            key = cv2.waitKey()
 
-        if key == 113:
-            quit()
-        elif key == 101:
-            change_epoch()
+            if key == 113:
+                quit()
+            elif key == 101:
+                change_epoch()