def concatenate(inputs, axis=-1, **kwargs):
  """Functional interface to the `Concatenate` layer.

  Arguments:
      inputs: A list of input tensors (at least 2).
      axis: Concatenation axis.
      **kwargs: Standard layer keyword arguments.

  Returns:
      A tensor, the concatenation of the inputs alongside axis `axis`.
  """
  return Concatenate(axis=axis, **kwargs)(inputs)