def concat(values, axis, name: "concat")
      if values.is_a?(Array)
        _op(:concat, axis, *values, name: name)
      else
        _op(:concat, axis, values, name: name)
      end
    end
def concat(values, axis, name: "concat")
      if values.is_a?(Array)
        _op(:concat, axis, *values, name: name)
      else
        _op(:concat, axis, values, name: name)
      end
    end
Concatenates tensors along one dimension.