class_docstr: StrategiesConstructor is used to construct the parallelization plan for the model execution.
  
  Args:
      graph (Graph): a Graph object used for analysis and strategy generation.
      device_mesh (DeviceMesh): a DeviceMesh object which contains the meta information about the cluster.
      solver_options (SolverOptions): a SolverOptions object which specifies the preferences for plan searching.
class_docstr_tok: ["StrategiesConstructor","is","used","to","construct","the","parallelization","plan","for","the","model","execution",".","Args",":","graph","(","Graph",")",":","a","Graph","object","used","for","analysis","and","strategy","generation",".","device_mesh","(","DeviceMesh",")",":","a","DeviceMesh","object","which","contains","the","meta","information","about","the","cluster",".","solver_options","(","SolverOptions",")",":","a","SolverOptions","object","which","specifies","the","preferences","for","plan","searching","."]
code: def generate_alias_set(self):
      node_list = [
          strategy_vector.node
          for strategy_vector in self.leaf_strategies
      ]
      common_blocks = find_repeat_blocks(
          node_list, self.root_module, common_length_threshold=10
      )
  
      repeat_block_nums = len(common_blocks)
      alias_set = {}
  
      if repeat_block_nums == 0:
          return alias_set
  
      for index, common_node in enumerate(common_blocks[0]):
          for i in range(1, repeat_block_nums):
              alias_set[
                  node_list.index(common_blocks[i][index])
              ] = node_list.index(common_node)
      return alias_set
  
file_path: ColossalAI/colossalai/auto_parallel/tensor_shard/solver/strategies_constructor.py
imports: import torch
  from torch.fx import Graph
  from colossalai.auto_parallel.tensor_shard.node_handler import GetattrHandler, OutputHandler, PlaceholderHandler, operator_registry
  from colossalai.auto_parallel.tensor_shard.sharding_strategy import StrategiesVector
  from colossalai.auto_parallel.tensor_shard.utils.factory import find_repeat_blocks
  from colossalai.device.device_mesh import DeviceMesh
  from ..options import DataloaderOption, SolverOptions
label_desc: Use image node_id 3 for calling the StrategiesConstructor obj's underlying member method code with example usage: obj.generate_alias_set() and returns: alias_set, alias_set