code: def forward(self, x):
      x_embedding = []
      for i in range(x.shape[1]):
          x_embedding.append(self.atom_embedding_list[i](x[:, i]))
  
      x_embedding = paddle.concat(x_embedding, axis=1)
  
      return self.mlp(x_embedding)
  
imports: import numpy
  import paddle
  import paddle.nn
  import paddle.distributed
  from pgl.utils.logger import log
  import features.local_feature
label_desc: Use image node_id 2 for calling the CatAtomEncoder obj's underlying member method code with example usage: obj.forward(x) and returns: self