code: def get_keys(self):
      for name, definition in self.definitions.items():
          if isinstance(
              definition, (ForeachDefinition, MatrixDefinition)
          ):
              yield from definition.get_generated_names()
              continue
          yield name
  
imports: import logging
  import os
  from collections.abc import Mapping, Sequence
  from copy import deepcopy
  from itertools import product
  from typing import TYPE_CHECKING, Any, Dict, List, NamedTuple, Optional, Tuple, Type, Union
  from funcy import collecting, first, isa, join, reraise
  from dvc.exceptions import DvcException
  from dvc.log import logger
  from dvc.parsing.interpolate import ParseError
  from dvc.utils.objects import cached_property
  from .context import Context, ContextError, KeyNotInContext, MergeError, Node, VarsAlreadyLoaded
  from .interpolate import check_recursive_parse_errors, is_interpolated_string, recurse, to_str
label_desc: Use image node_id 6 for calling the DataResolver obj's underlying member method code with example usage: obj.get_keys() without return types