docstr: return the smaller of left and right, and guard on that choice
code: def evaluate_min(self, left: Expr, right: Expr) -> Expr:
      """return the smaller of left and right, and guard on that choice"""
      lv = self.size_hint(left)
      rv = self.size_hint(right)
      if lv <= rv:
          self.guard_leq(left, right)
          return left
      else:
          self.guard_leq(right, left)
          return right
  
imports: import functools
  import itertools
  import logging
  from typing import Any, Callable, Dict, Iterable, List, Optional, Set, Tuple, Union
  import sympy
  from sympy import Expr
  from torch.fx.experimental.symbolic_shapes import ShapeEnv
  from torch.utils._sympy.functions import FloorDiv, ModularIndexing
  from torch.utils._sympy.value_ranges import bound_sympy
  from .utils import sympy_subs, sympy_symbol, VarRanges
  from .virtualized import V
label_desc: Use image node_id 20 for calling the SizeVarAllocator obj's underlying member method code with example usage: obj.evaluate_min(left, right) and returns: left, right