code: def __call__(self, x):
      return self.forward(x)
  
file_path: PGL/examples/metapath2vec/model.py
imports: import math
  import time
  import paddle
  import paddle.nn
  import paddle.nn.functional
label_desc: Use image node_id 3 for calling the SparseEmbedding obj's underlying member method code with example usage: obj.__call__(x) and returns: self