code: def schedule(self, materials=None, variables=None, secure_variables=None):
          
          return self._pipeline.schedule(
              name=self.data.name,
              materials=materials,
              variables=variables,
              secure_variables=secure_variables
          )
docs: Scheduling allows user to trigger a specific pipeline.
  
          :param materials: material revisions to use.
          :param variables: environment variables to set.
          :param secure_variables: secure environment variables to set.
          :return: a text confirmation.