code: def from_yaml_str(config_contents: str) -> "SelectiveBuilder":
      contents = yaml.safe_load(config_contents)
      return SelectiveBuilder.from_yaml_dict(contents)
  
imports: from collections import defaultdict
  from collections.abc import Iterable
  from dataclasses import dataclass
  from typing import Dict, List, Optional, Set, Tuple
  import yaml
  from torchgen.model import NativeFunction
  from torchgen.selective_build.operator import merge_debug_info, merge_operator_dicts, SelectiveBuildOperator, strip_operator_overload_name
label_desc: Use image node_id 3 for calling the SelectiveBuilder obj's underlying member method code with example usage: obj.from_yaml_str(config_contents) and returns: SelectiveBuilder