code: def gelu(x):
      """An approximation of gelu.
      See: https://arxiv.org/pdf/1606.08415.pdf
      """
      return (
          0.5
          * x
          * (
              1.0
              + K.tanh(
                  math.sqrt(2.0 / math.pi)
                  * (x + 0.044715 * K.pow(x, 3))
              )
          )
      )
  
file_path: delta/delta/layers/utils.py
imports: import math
  import delta.compat
  from tensorflow.python.keras import backend
  import delta.utils
label_desc: Use image node_id 1 for calling a global function with example usage: gelu(x) and returns: unknown