code: def create_slab() -> tuple[Atoms, float]:
      calculator = EMT()
      bulk_atoms = bulk("Pt", cubic=True)
      bulk_atoms.calc = calculator
  
      a = np.mean(np.diag(bulk_atoms.cell))
      slab = fcc111(
          "Pt", a=a, size=(4, 4, 4), vacuum=40.0, periodic=True
      )
      slab.calc = calculator
      E_slab = get_opt_energy(slab, fmax=1e-4)
      return slab, E_slab
  
imports: from __future__ import annotations
  import io
  import logging
  import os
  import sys
  import uuid
  from ase import Atoms
  from ase.build import bulk, fcc111, molecule, add_adsorbate
  from ase.calculators.emt import EMT
  from ase.io import write, read
  from ase.optimize import LBFGS
  import numpy
  from optuna.artifacts import FileSystemArtifactStore
  from optuna.artifacts import upload_artifact
  from optuna.logging import get_logger
  from optuna import create_study
  from optuna import Trial
label_desc: Use image node_id 2 for calling a global function with example usage: create_slab() and returns: slab,  E_slab