code: def _init_resdef(self):
      pkg = yaml.safe_load(self.dist.get_metadata("PACKAGE"))
      if pkg:
          data = pkg.get("resources", {}).get(self.name)
      else:
          data = None
      if not data:
          raise ValueError(
              f"undefined resource '{self.name}' in {self.dist}"
          )
      fullname = pkg["package"] + "/" + self.name
      resdef = resourcedef.ResourceDef(self.name, data, fullname)
      resdef.dist = self.dist
      return resdef
  
file_path: guildai/guild/package.py
imports: import logging
  import os
  import subprocess
  import sys
  import yaml
  from guild import resource
  from guild import resourcedef
  from guild import util
label_desc: Use image node_id 1 for calling the PackageResource obj's underlying member method code with example usage: obj._init_resdef() and returns: resdef