      """
      return _FS_BACKEND
  
  
  def set_backend(backend):
      """ Override the configured backend with the given backend.
  
      Parameters
      ----------
      backend: ["amd", "cpu", "nvidia", "apple_silicon"]
 
</s> remove     _FS_BACKEND = backend.lower()
 </s> add     backend = cast(ValidBackends, backend.lower())
    _FS_BACKEND = backend </s> remove def get_backend():
 </s> add def get_backend() -> ValidBackends: </s> remove _FS_BACKEND = _Backend().backend
 </s> add _FS_BACKEND: ValidBackends = _Backend().backend </s> remove     def __init__(self):
 </s> add     def __init__(self) -> None:
def set_backend(backend: str) -> None:
      """
      return _FS_BACKEND
  
  
def set_backend(backend: str) -> None:
      """ Override the configured backend with the given backend.
  
      Parameters
      ----------
      backend: ["amd", "cpu", "nvidia", "apple_silicon"]
keep keep keep keep replace keep keep keep keep keep
 lib.Utils - add DPI detector 
lib/utils.py