Update config.json

config.json

@@ -1,5 +1,5 @@
 {
-    "model": "Tfdf.keras.GradientBoostedTreesModel()",
+    "model": ["Tfdf.keras.GradientBoostedTreesModel"],
     "growing_strategy": "BEST_FIRST_GLOBAL",
     "num_trees": "250",
     "min_examples": "6",
@@ -11,5 +11,4 @@
     "num_epochs": "1",
     "task": "tfdf.keras.Task.CLASSIFICATION",
     "loss": "DEFAULT"
-
 }