fix detection_map. test=develop (#22705)

paddle/fluid/operators/detection_map_op.h

@@ -420,8 +420,11 @@ class DetectionMAPOpKernel : public framework::OpKernel<T> {
     for (auto it = label_pos_count.begin(); it != label_pos_count.end(); ++it) {
       int label = it->first;
       int label_num_pos = it->second;
-      if (label_num_pos == background_label ||
-          true_pos.find(label) == true_pos.end()) {
+      if (label_num_pos == background_label) {
+        continue;
+      }
+      if (true_pos.find(label) == true_pos.end()) {
+        count++;
         continue;
       }
       auto label_true_pos = true_pos.find(label)->second;

python/paddle/fluid/tests/unittests/test_detection_map_op.py

@@ -181,7 +181,10 @@ class TestDetectionMAPOp(OpTest):
             false_pos[label].append([score, fp])
 
         for (label, label_pos_num) in six.iteritems(label_count):
-            if label_pos_num == 0 or label not in true_pos: continue
+            if label_pos_num == 0: continue
+            if label not in true_pos:
+                count += 1
+                continue
             label_true_pos = true_pos[label]
             label_false_pos = false_pos[label]
 
@@ -281,5 +284,30 @@ class TestDetectionMAPOpMultiBatch(TestDetectionMAPOp):
         self.false_pos = [[0.7, 0.], [0.3, 1.], [0.2, 0.], [0.8, 1.], [0.1, 0.]]
 
 
+class TestDetectionMAPOp11PointWithClassNoTP(TestDetectionMAPOp):
+    def init_test_case(self):
+        self.overlap_threshold = 0.3
+        self.evaluate_difficult = True
+        self.ap_type = "11point"
+
+        self.label_lod = [[2]]
+        # label difficult xmin ymin xmax ymax
+        self.label = [[2, 0, 0.3, 0.3, 0.6, 0.5], [1, 0, 0.7, 0.1, 0.9, 0.3]]
+
+        # label score xmin ymin xmax ymax difficult
+        self.detect_lod = [[1]]
+        self.detect = [[1, 0.2, 0.8, 0.1, 1.0, 0.3]]
+
+        # label score true_pos false_pos
+        self.tf_pos_lod = [[3, 4]]
+        self.tf_pos = [[1, 0.2, 1, 0]]
+
+        self.class_pos_count = []
+        self.true_pos_lod = [[]]
+        self.true_pos = [[]]
+        self.false_pos_lod = [[]]
+        self.false_pos = [[]]
+
+
 if __name__ == '__main__':
     unittest.main()