code: def exp(x):
      """evaluates the exponential of an interval"""
      np = import_module("numpy")
      if isinstance(x, (int, float)):
          return interval(np.exp(x), np.exp(x))
      elif isinstance(x, interval):
          return interval(
              np.exp(x.start), np.exp(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 2 for calling a global function with example usage: exp(x) and returns: interval, interval