code: def tanh(x):
      """Evaluates the hyperbolic tan of an interval"""
      np = import_module("numpy")
      if isinstance(x, (int, float)):
          return interval(np.tanh(x), np.tanh(x))
      elif isinstance(x, interval):
          return interval(
              np.tanh(x.start), np.tanh(x.end), is_valid=x.is_valid
          )
      else:
          raise NotImplementedError
  
imports: from functools import reduce
  from sympy.plotting.intervalmath import interval
  from sympy.external import import_module
label_desc: Use image node_id 14 for calling a global function with example usage: tanh(x) and returns: interval, interval