Update model.json

model.json

@@ -13,7 +13,7 @@
     "text_encoder_num_heads" : 4,
     "text_encoder_dim" : 192,
     "query_head_dim" : 32,
-    "value_head_dim" : 32,
+    "value_head_dim" : 12,
     "pos_head_dim" : 4,
     "pos_dim" : 48,
     "time_embed_dim" : 192,