code: def get_act(identifier):
      if identifier == "prelu":
          return PReLU()
      else:
          return Activation(identifier)
  
file_path: spektral/spektral/models/general_gnn.py
imports: from tensorflow.keras import Model, Sequential
  from tensorflow.keras.layers import Activation, Add, BatchNormalization, Concatenate, Dense, Dropout, PReLU
  from spektral.layers import GeneralConv
  from spektral.layers.pooling import global_pool
label_desc: Use image node_id 1 for calling a global function with example usage: get_act(identifier) and returns: PReLU, Activation