code: def forward(self, batch_x):
      for lin in self.enc_lins:
          batch_x = lin(batch_x)
      batch_x = self.drop(batch_x)
      return batch_x
  
imports: import pgl
  import paddle
  import paddle.nn
  import paddle.nn.functional
  import numpy
  from pgl.utils.logger import log
  import pgl.nn
  import math
label_desc: Use image node_id 2 for calling the Encoder obj's underlying member method code with example usage: obj.forward(batch_x) and returns: batch_x