code: def cast_simplify(expr):
      """Replaces (<wrapped cast>, (.)) with (.)."""
      if isinstance(expr[0], tf.Tensor) and expr[0].op.type == "Cast":
          return expr[1]
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  import tensorflow
label_desc: Use image node_id 25 for calling a global function with example usage: cast_simplify(expr) and returns: expr