code: def load_and_parse(self, package_name, root_dir, relative_dirs, tags=None):
          
  
          extension = "[!.#~]*.csv"
          if dbt.flags.STRICT_MODE:
              dbt.contracts.project.ProjectList(**self.all_projects)
  
          file_matches = dbt.clients.system.find_matching(
              root_dir,
              relative_dirs,
              extension)
  
          # we only want to parse seeds if we're inside 'dbt seed'
          should_parse = self.root_project_config.args.which == 'seed'
  
          result = {}
          for file_match in file_matches:
              node, agate_table = self.parse_seed_file(file_match, root_dir,
                                                       package_name,
                                                       should_parse)
              node_path = self.get_path(NodeType.Seed, package_name, node.name)
              parsed = self.parse_node(node, node_path,
                                       self.all_projects.get(package_name),
                                       tags=tags, agate_table=agate_table)
              result[node_path] = parsed
  
          return result
docs: Load and parse seed files in a list of directories. Returns a dict
             that maps unique ids onto ParsedNodes