old_contents: from .base import BaseRegularization, BaseComboRegularization
  from .regularization_mesh import RegularizationMesh
  from .tikhonov import (
      SimpleSmall,
      SimpleSmoothDeriv,
      Simple,
      Small,
      SmoothDeriv,
      SmoothDeriv2,
      Tikhonov,
  )
  from .sparse import SparseSmall, SparseDeriv, Sparse
  
new_contents: from .base import BaseRegularization, BaseComboRegularization
  from .regularization_mesh import RegularizationMesh
  from .tikhonov import (
      SimpleSmall,
      SimpleSmoothDeriv,
      Simple,
      Small,
      SmoothDeriv,
      SmoothDeriv2,
      Tikhonov,
  )
  from .sparse import SparseSmall, SparseDeriv, Sparse
  from .coupling import CrossGradient, Linear
  
subject: Update __init__.py