fix image_size usage

utils.py

@@ -14,15 +14,16 @@ def sahi_mmdet_inference(
     overlap_height_ratio=0.2,
     overlap_width_ratio=0.2,
     image_size=640,
-    postprocess_type="UNIONMERGE",
+    postprocess_type="GREEDYNMM",
     postprocess_match_metric="IOS",
     postprocess_match_threshold=0.5,
     postprocess_class_agnostic=False,
 ):
 
     # standard inference
+    detection_model.image_size = image_size
     prediction_result_1 = sahi.predict.get_prediction(
-        image=image, detection_model=detection_model, image_size=image_size
+        image=image, detection_model=detection_model
     )
     visual_result_1 = sahi.utils.cv.visualize_object_predictions(
         image=numpy.array(image),
@@ -34,7 +35,6 @@ def sahi_mmdet_inference(
     prediction_result_2 = sahi.predict.get_sliced_prediction(
         image=image,
         detection_model=detection_model,
-        image_size=image_size,
         slice_height=slice_height,
         slice_width=slice_width,
         overlap_height_ratio=overlap_height_ratio,