code: def test_user_init_different_initial_values():
      posterior = stan.build(program_code, data=data, random_seed=2)
  
      mu1 = posterior.sample(
          num_chains=1, num_samples=10, init=[{"mu": 3}]
      )["mu"].ravel()
      mu2 = posterior.sample(
          num_chains=1, num_samples=10, init=[{"mu": 4}]
      )["mu"].ravel()
      assert mu1[0] != mu2[0]
  
imports: import numpy
  import stan
label_desc: Use image node_id 3 for calling a global function with example usage: test_user_init_different_initial_values() without return types