name : "MultiSlotDataFeed" batch_size : 32 multi_slot_desc {
  slots {
  name:
    "target" type : "uint64" is_dense : false is_used : false
  }
  slots {
  name:
    "context" type : "uint64" is_dense : false is_used : false
  }
  slots {
  name:
    "path_table" type : "uint64" is_dense : false is_used : false
  }
  slots {
  name:
    "path_code" type : "uint64" is_dense : false is_used : false
  }
}