code: def upload_shards(self, part_shard_id, shard):
      partition_idx, shard_idx = part_shard_id
      if partition_idx not in self.partitions:
          self.partitions[partition_idx] = {}
      self.partitions[partition_idx][shard_idx] = shard
      return 0
  
imports: from collections import defaultdict
  import ray
  import ray._private.services
  import uuid
  import random
  from packaging import version
  from zoo.orca.data import XShards
  from zoo.ray import RayContext
  import logging
label_desc: Use image node_id 2 for calling the LocalStore obj's underlying member method code with example usage: obj.upload_shards(part_shard_id, shard) and returns: int