docstr: Check this optimizer is available.
  
  Returns
  -------
  is_available : bool
      Available.
code: def is_available(cls) -> bool:
      """
      Check this optimizer is available.
  
      Returns
      -------
      is_available : bool
          Available.
      """
  
file_path: mars/mars/optimization/physical/core.py
imports: from abc import ABC, abstractmethod
  from typing import List, Tuple, Dict, Type
  from ...core import ChunkGraph, ChunkType, OperandType
  from ...utils import build_fuse_chunk
label_desc: Use image node_id 2 for calling the RuntimeOptimizer obj's underlying member method code with example usage: obj.is_available(cls) without return types