code: def forward(self, enc_inputs):
      conv_features, src_pos, src_slf_attn_bias = enc_inputs
      enc_input = self.prepare_encoder(conv_features, src_pos)
      enc_output = self.encoder(enc_input, src_slf_attn_bias)
      return enc_output
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import math
  import paddle
  from paddle import ParamAttr, nn
  from paddle import nn, ParamAttr
  from paddle.nn import functional
  import numpy
label_desc: Use image node_id 2 for calling the WrapEncoderForFeature obj's underlying member method code with example usage: obj.forward(enc_inputs) and returns: enc_output