code: def create(max_kl, cg_iters, line_search_iters, cg_damping, entropy_coef, vf_iters, discount_factor,
             gae_lambda=1.0, improvement_acceptance_ratio=0.1, max_grad_norm=0.5):
      
      return TrpoPolicyGradient(
          max_kl, int(cg_iters), int(line_search_iters), cg_damping, entropy_coef, vf_iters,
          discount_factor=discount_factor,
          gae_lambda=gae_lambda,
          improvement_acceptance_ratio=improvement_acceptance_ratio,
          max_grad_norm=max_grad_norm
      )
docs: Vel factory function