Update app.py

app.py

@@ -61,7 +61,7 @@ def predict(pilimg,threshold):
         category_index,
         use_normalized_coordinates=True,
         max_boxes_to_draw=20,
-        min_score_thresh=threshold,
+        min_score_thresh=threshold.astype(float),
         agnostic_mode=False,
         line_thickness=2)