Merge pull request #3515 from LDOUBLEV/fix_qa_bugs

Fix qa bugs

configs/det/det_mv3_db.yml

@@ -128,4 +128,4 @@ Eval:
     drop_last: False
     batch_size_per_card: 1 # must be 1
     num_workers: 8
-    use_shared_memory: False
+    use_shared_memory: False

ppocr/data/imaug/label_ops.py

@@ -53,9 +53,11 @@ class DetLabelEncode(object):
                 txt_tags.append(True)
             else:
                 txt_tags.append(False)
+        if len(boxes) == 0:
+            return None
         boxes = self.expand_points_num(boxes)
-        #boxes = np.array(boxes, dtype=np.float32)
-        #txt_tags = np.array(txt_tags, dtype=np.bool)
+        boxes = np.array(boxes, dtype=np.float32)
+        txt_tags = np.array(txt_tags, dtype=np.bool)
 
         data['polys'] = boxes
         data['texts'] = txts