class_docstr: Abstract class for Backend Storage.
  This class defines the API interface for front ends to connect with various types of backends.
docstr: Return runs that match the given list of search expressions within the experiments, as
  well as a pagination token (indicating where the next page should start). Subclasses of
  ``AbstractStore`` should implement this method to support pagination instead of
  ``search_runs``.
  
  See ``search_runs`` for parameter descriptions.
  
  :return: A tuple of ``runs`` and ``token`` where ``runs`` is a list of
      :py:class:`mlflow.entities.Run` objects that satisfy the search expressions,
      and ``token`` is the pagination token for the next page of results.
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code: def _search_runs(
      self,
      experiment_ids,
      filter_string,
      run_view_type,
      max_results,
      order_by,
      page_token,
  ):
      """
      Return runs that match the given list of search expressions within the experiments, as
      well as a pagination token (indicating where the next page should start). Subclasses of
      ``AbstractStore`` should implement this method to support pagination instead of
      ``search_runs``.
  
      See ``search_runs`` for parameter descriptions.
  
      :return: A tuple of ``runs`` and ``token`` where ``runs`` is a list of
          :py:class:`mlflow.entities.Run` objects that satisfy the search expressions,
          and ``token`` is the pagination token for the next page of results.
      """
      pass
  
imports: from abc import ABCMeta, abstractmethod
  from typing import List, Optional
  from mlflow.entities import DatasetInput, ViewType
  from mlflow.store.entities.paged_list import PagedList
  from mlflow.store.tracking import SEARCH_MAX_RESULTS_DEFAULT
  from mlflow.utils.annotations import developer_stable, experimental
  from mlflow.utils.async_logging.async_logging_queue import AsyncLoggingQueue
  from mlflow.utils.async_logging.run_operations import RunOperations
label_desc: Use image node_id 23 for calling the AbstractStore obj's underlying member method code with example usage: obj._search_runs(experiment_ids, filter_string, run_view_type, max_results, order_by, page_token) without return types