updated loading script

EMT.py

@@ -55,7 +55,7 @@ class EMT(datasets.GeneratorBasedBuilder):
                     "image": datasets.Image(),
                     "objects": datasets.Sequence(
                         {
-                            "bbox": datasets.Sequence(datasets.Float32()),
+                            "bbox": datasets.Sequence(datasets.Value("float32")),
                             "class_id": datasets.Value("int32"),
                             "track_id": datasets.Value("int32"),
                             "class_name": datasets.Value("string"),