code: def is_valid(self):
          
          managed_policy_map = self.managed_policy_loader.load()
  
          sam_translator = Translator(managed_policy_map=managed_policy_map,
                                      sam_parser=self.sam_parser,
                                      plugins=[])
  
          self._replace_local_codeuri()
  
          try:
              template = sam_translator.translate(sam_template=self.sam_template,
                                                  parameter_values={})
              LOG.debug("Translated template is:\n%s", yaml_dump(template))
          except InvalidDocumentException as e:
              raise InvalidSamDocumentException(
                  functools.reduce(lambda message, error: message + ' ' + str(error), e.causes, str(e)))
docs: Runs the SAM Translator to determine if the template provided is valid. This is similar to running a
          ChangeSet in CloudFormation for a SAM Template
  
          Raises
          -------
          InvalidSamDocumentException
               If the template is not valid, an InvalidSamDocumentException is raised