content: from typing import *
  
  BACKEND = 'xformers' 
  DEBUG = False
  
  def __from_env():
      import os
      
      global BACKEND
      global DEBUG
      
      env_attn_backend = os.environ.get('ATTN_BACKEND')
      env_sttn_debug = os.environ.get('ATTN_DEBUG')
      
      if env_attn_backend is not None and env_attn_backend in ['xformers', 'flash_attn', 'sdpa', 'naive']:
          BACKEND = env_attn_backend
      if env_sttn_debug is not None:
          DEBUG = env_sttn_debug == '1'
  
      print(f"[ATTENTION] Using backend: {BACKEND}")
          
  
  __from_env()
      
  
  def set_backend(backend: Literal['xformers', 'flash_attn']):
      global BACKEND
      BACKEND = backend
  
  def set_debug(debug: bool):
      global DEBUG
      DEBUG = debug
  
  
  from .full_attn import *
  from .modules import *
  