code: def net(obs, act_dim):
      hid1_size = act_dim * 10
      hid1 = fluid.layers.fc(obs, size=hid1_size)
      prob = fluid.layers.fc(hid1, size=act_dim, act="softmax")
      return prob
  
label_desc: Use image node_id 1 for calling a global function with example usage: net(obs, act_dim) and returns: prob