code: def forward(self, x, attn_mask, cache):
      query = self.pre_norm_layer(x)
      attn_output, new_cache = self.self_attn(
          query, None, None, attn_mask, cache
      )
      attn_output = self.dropout_layer(attn_output)
      attn_output = attn_output + x
      ffd_input = self.post_norm_layer(attn_output)
  
      ffd_output = self.fc1(ffd_input)
      ffd_output = self.gelu_layer(ffd_output)
      ffd_output = self.dropout_layer(ffd_output)
  
      ffd_output = self.fc2(ffd_output)
      ffd_output = self.dropout_layer(ffd_output)
      out = ffd_output + attn_output
  
      return out, new_cache
  
imports: from collections import namedtuple
  import paddle
  import paddle.nn
  import paddle.nn.functional
label_desc: Use image node_id 2 for calling the Plato2EncoderLayer obj's underlying member method code with example usage: obj.forward(x, attn_mask, cache) and returns: out,  new_cache