code: def bin_depth_threshold_hook(self, expr, **kwargs):
      if expr in self._cached_expr_results:
          return self._cached_expr_results[expr].var_name
      result = self._do_interpret(expr, **kwargs)
      return self._cache_reused_expr(expr, result)
  
file_path: m2cgen/m2cgen/interpreters/elixir/interpreter.py
imports: from pathlib import Path
  from m2cgen.ast import BinNumOpType
  from m2cgen.interpreters.elixir.code_generator import ElixirCodeGenerator
  from m2cgen.interpreters.interpreter import FunctionalToCodeInterpreter
  from m2cgen.interpreters.mixins import BinExpressionDepthTrackingMixin, LinearAlgebraMixin, PowExprFunctionMixin
  from m2cgen.interpreters.utils import get_file_content
label_desc: Use image node_id 8 for calling the ElixirInterpreter obj's underlying member method code with example usage: obj.bin_depth_threshold_hook(expr) and returns: self, self