Fix masks merging in ZSL VPT (#200)

* Fix masks merging

* Update refs for zsl

* Del redundant mask clip

Author: sovrasov

model_api/python/model_api/models/visual_prompting.py

@@ -286,8 +286,7 @@ def learn(
                     masks = _polygon_to_mask(inputs_decoder["polygon"], *original_shape)
                 else:
                     raise RuntimeError("Unsupported type of prompt")
-                ref_mask[masks] += 1
-            ref_mask = np.clip(ref_mask, 0, 1)
+                ref_mask = np.where(masks, 1, ref_mask)
 
             ref_feat: np.ndarray | None = None
             cur_default_threshold_reference = self._default_threshold_reference

tests/python/accuracy/public_scope.json

@@ -406,7 +406,7 @@
         "test_data": [
             {
                 "image": "coco128/images/train2017/000000000471.jpg",
-                "reference": ["mask sum: 14991; [385.0, 315.0] iou: 0.930 [44.0, 205.0] iou: 0.665 [605.0, 224.0] iou: 0.653, mask sum: 248221; [374.0, 365.0] iou: 0.901 [335.0, 34.0] iou: 0.901 [354.0, 135.0] iou: 0.709"]
+                "reference": ["mask sum: 108565; [385.0, 315.0] iou: 0.930 [335.0, 414.0] iou: 0.763 [44.0, 205.0] iou: 0.665 [605.0, 224.0] iou: 0.653, mask sum: 73920; [175.0, 215.0] iou: 0.781 [124.0, 165.0] iou: 0.651"]
             }
         ]
     },