code: def _build_envs(cls, ctx, op):
      # set mars envs
      envs = dict()
      envs["RANK"] = str(op.rank)
      envs["WORLD_SIZE"] = str(op.world_size)
      return envs
  
imports: import os
  import sys
  from typing import Any, BinaryIO, Dict, List, TextIO, Union
  import numpy
  from ..None import opcodes
  from ..core import OutputType, TILEABLE_TYPE
  from ..core.context import Context
  from ..core.operand import MergeDictOperand
  from ..serialization.serializables import BytesField, ListField, Int32Field, DictField, BoolField
  from ..typing import TileableType, SessionType
  from ..utils import to_binary, build_fetch_tileable
label_desc: Use image node_id 11 for calling the RunScript obj's underlying member method code with example usage: obj._build_envs(cls, ctx, op) and returns: envs