In this task, you are given a paper review. Based on the review, your job is to identify language and generate "en" if the review is in English or generate "es" if the review is in Spanish. Note that URLs in the text have been replaced with [Link].

Let me give you an example: Este articulo no es un articulo de investigacion, ya que solo muestra como programar un robot mediante la herramienta de logica difusa. Este tema ya ha sido propuesto como solucion en navegacion de robots.
The answer to this example can be: es
Here is why: This review is written in spanish. Hence, the label is 'es'.

OK. solve this:
Paper Strengths: -- Elegant use of MoE for expanding model capacity and enabling training large models necessary for exploiting very large datasets in a computationally feasible manner -- The effective batch size for training the MoE drastically increased also -- Interesting experimental results on the effects of increasing the number of MoEs, which is expected. Paper Weaknesses: --- there are many different ways of increasing model capacity to enable the exploitation of very large datasets; it would be very nice to discuss the use of MoE and other alternatives in terms of computational efficiency and other factors.
Answer:
en