code: def debug_string(
      self,
      nodes: List[NodeID],
      pending_nodes: Dict[NodeID, int],
      unused_resources_by_ip: Dict[str, ResourceDict],
  ) -> str:
      node_resources, node_type_counts = self.calculate_node_resources(
          nodes, pending_nodes, unused_resources_by_ip
      )
  
      out = "Worker node types:"
      for node_type, count in node_type_counts.items():
          out += "\n - {}: {}".format(node_type, count)
          if pending_nodes.get(node_type):
              out += " ({} pending)".format(pending_nodes[node_type])
  
      return out
  
imports: import collections
  import copy
  import logging
  import os
  from abc import abstractmethod
  from functools import partial
  from typing import Callable, Dict, List, Optional, Tuple
  import ray
  from ray._private.gcs_utils import PlacementGroupTableData
  from ray.autoscaler._private.constants import AUTOSCALER_CONSERVE_GPU_NODES, AUTOSCALER_UTILIZATION_SCORER_KEY
  from ray.autoscaler._private.loader import load_function_or_class
  from ray.autoscaler._private.node_provider_availability_tracker import NodeAvailabilitySummary
  from ray.autoscaler._private.util import NodeID, NodeIP, NodeType, NodeTypeConfigDict, ResourceDict, is_placement_group_resource
  from ray.autoscaler.node_provider import NodeProvider
  from ray.autoscaler.tags import NODE_KIND_HEAD, NODE_KIND_UNMANAGED, NODE_KIND_WORKER, TAG_RAY_NODE_KIND, TAG_RAY_USER_NODE_TYPE
  from ray.core.generated.common_pb2 import PlacementStrategy
label_desc: Use image node_id 11 for calling the ResourceDemandScheduler obj's underlying member method code with example usage: obj.debug_string(nodes, pending_nodes, unused_resources_by_ip) and returns: out