Add evaluation script test_net.py

Author: roytseng-tw

.vscode/settings.json

@@ -1,4 +1,5 @@
 {
     "python.linting.pylintEnabled": true,
     "python.linting.flake8Enabled": false,
+    "python.autoComplete.extraPaths": ["${workspaceRoot}/lib"],
 }

lib/core/test.py

@@ -346,6 +346,9 @@ def segm_results(cls_boxes, masks, ref_boxes, im_h, im_w):
 
             # Get RLE encoding used by the COCO evaluation API
             rle = mask_util.encode(np.array(im_mask[:, :, np.newaxis], order='F'))[0]
+            # For dumping to json, need to decode the byte string.
+            # https://github.com/cocodataset/cocoapi/issues/70
+            rle['counts'] = rle['counts'].decode('ascii')
             segms.append(rle)
 
             mask_ind += 1