code: def test_kh_food_beta():
      search_space = search.SearchSpace(
          n_agents=5,
          n_variables=2,
          lower_bound=[0, 0],
          upper_bound=[10, 10],
      )
  
      new_kh = kh.KH()
      new_kh.compile(search_space)
  
      beta = new_kh._food_beta(
          search_space.agents[0],
          search_space.agents[-1],
          search_space.agents[0],
          search_space.agents[0],
          1,
      )
  
      assert beta.shape == (2, 1)
  
imports: import numpy
  from opytimizer.optimizers.swarm import kh
  from opytimizer.spaces import search
label_desc: Use image node_id 10 for calling a global function with example usage: test_kh_food_beta() without return types