code: def gen_cache(self, key):
      return self.self_attn.gen_cache(key)
  
imports: from collections import namedtuple
  import paddle
  import paddle.nn
  import paddle.nn.functional
label_desc: Use image node_id 3 for calling the Plato2EncoderLayer obj's underlying member method code with example usage: obj.gen_cache(key) and returns: self