Remove metadata JSON files

test_metadata.json

@@ -1,48 +0,0 @@
-{
-  "x_offsets": [
-    -11,
-    -10,
-    -9,
-    -8,
-    -7,
-    -6,
-    -5,
-    -4,
-    -3,
-    -2,
-    -1,
-    0
-  ],
-  "y_offsets": [
-    1,
-    2,
-    3,
-    4,
-    5,
-    6,
-    7,
-    8,
-    9,
-    10,
-    11,
-    12
-  ],
-  "x_shape": [
-    10419,
-    12,
-    325,
-    2
-  ],
-  "y_shape": [
-    10419,
-    12,
-    325,
-    2
-  ],
-  "num_samples": 10419,
-  "input_length": 12,
-  "output_length": 12,
-  "num_nodes": 325,
-  "input_dim": 2,
-  "output_dim": 2
-}