code: def activation(_input, activation="relu"):
      if activation == "relu":
          return tf.nn.relu(_input)
      elif activation == "tanh":
          return tf.tanh(_input)
      elif activation == "sigmoid":
          return tf.sigmoid(_input)
      elif activation == "softmax":
          return tf.nn.softmax(_input)
      elif activation is None:
          return _input
      else:
          raise ValueError("Do not support %s" % activation)
  
imports: import os
  import shutil
  import tensorflow
  import numpy
  import time
  from datetime import timedelta
  import json
  import pickle
label_desc: Use image node_id 24 for calling the BasicModel obj's underlying member method code with example usage: obj.activation(_input, activation) and returns: tf, tf, tf, tf, _input