code: def gen_caches(self, key):
      caches = [
          encoder_layer.gen_cache(key)
          for encoder_layer in self.encoder_layers
      ]
      return caches
  
imports: from collections import namedtuple
  import paddle
  import paddle.nn
  import paddle.nn.functional
label_desc: Use image node_id 4 for calling the Plato2Encoder obj's underlying member method code with example usage: obj.gen_caches(key) and returns: caches