code: def exponential(x, rate):
      return rate * exp(-rate * x)
  
file_path: sympy/sympy/benchmarks/bench_meijerint.py
imports: from sympy.core.numbers import oo, pi
  from sympy.core.symbol import Symbol, symbols
  from sympy.functions.elementary.exponential import exp
  from sympy.functions.elementary.miscellaneous import sqrt
  from sympy.functions.special.bessel import besseli
  from sympy.functions.special.gamma_functions import gamma
  from sympy.integrals.integrals import integrate
  from sympy.integrals.transforms import mellin_transform, inverse_fourier_transform, inverse_mellin_transform, laplace_transform, inverse_laplace_transform, fourier_transform
  from sympy.abc import x, y
  from time import time
  from sympy.core.cache import clear_cache
  import sys
label_desc: Use image node_id 2 for calling a global function with example usage: exponential(x, rate) and returns: unknown