code: def get_learning_rate(self, iter):
      return self.init_lr * (
          (1.0 - iter * 1.0 / self.max_iter) ** self.power
      )
  
file_path: nnabla/python/test/utils/learning_rate_scheduler/test_polynomial_scheduler.py
imports: import pytest
  from learning_rate_scheduler_test_utils import scheduler_tester
  import nnabla.utils.learning_rate_scheduler
label_desc: Use image node_id 2 for calling the RefPolynomial obj's underlying member method code with example usage: obj.get_learning_rate(iter) and returns: unknown