fix: modalities taxonomy, task_type, url consolidation, structural corrections

metadata.json

@@ -7,7 +7,7 @@
         "en"
       ],
       "modalities": [
-        "image"
+        "single_image_start"
       ],
       "task_type": "multiple_choice_vqa",
       "prompt_template": "<image>{{ question }}\nAnswer with the option's letter from the given choices directly.",
@@ -38,11 +38,9 @@
         },
         "source": {
           "format": "huggingface",
-          "links": {
-            "val": "https://huggingface.co/datasets/Lin-Chen/MMStar/viewer/val"
-          },
-          "repo": "Lin-Chen/MMStar",
-          "url": "https://huggingface.co/datasets/Lin-Chen/MMStar"
+          "url": {
+            "val": "https://huggingface.co/datasets/Lin-Chen/MMStar"
+          }
         }
       }
     }