docstr: Returns a unique identifier for this backend
docstr_tok: ["Returns","a","unique","identifier","for","this","backend"]
code: def hash(self) -> str:
      """Returns a unique identifier for this backend"""
      raise NotImplementedError
  
file_path: triton/python/triton/backends/compiler.py
imports: from abc import ABCMeta, abstractmethod, abstractclassmethod
  import os
  import subprocess
  import re
label_desc: Use image node_id 4 for calling the BaseBackend obj's underlying member method code with example usage: obj.hash() without return types