super-gradients/tests/integration_tests/lr_test.py

import shutil
import unittest
import os

from super_gradients.training import models

from super_gradients import Trainer
from super_gradients.training.dataloaders.dataloaders import classification_test_dataloader
from super_gradients.training.metrics import Accuracy, Top5


class LRTest(unittest.TestCase):
    @classmethod
    def setUp(cls):
        # NAMES FOR THE EXPERIMENTS TO LATER DELETE
        cls.folder_name = 'lr_test'
        cls.training_params = {"max_epochs": 1,
                               "silent_mode": True,
                               "initial_lr": 0.1,
                               "loss": "cross_entropy", "train_metrics_list": [Accuracy(), Top5()],
                               "valid_metrics_list": [Accuracy(), Top5()],
                               "metric_to_watch": "Accuracy",
                               "greater_metric_to_watch_is_better": True}

    @classmethod
    def tearDownClass(cls) -> None:
        # ERASE THE FOLDER THAT WAS CREATED DURING THIS TEST
        if os.path.isdir(os.path.join('checkpoints', cls.folder_name)):
            shutil.rmtree(os.path.join('checkpoints', cls.folder_name))

    @staticmethod
    def get_trainer(name=''):
        trainer = Trainer(name)
        model = models.get("resnet18_cifar", num_classes=5)
        return trainer, model

    def test_function_lr(self):
        trainer, model = self.get_trainer(self.folder_name)

        def test_lr_function(initial_lr, epoch, iter, max_epoch, iters_per_epoch, **kwargs):
            return initial_lr * (1 - ((epoch * iters_per_epoch + iter) / (max_epoch * iters_per_epoch)))

        # test if we are able that lr_function supports functions with this structure
        training_params = {**self.training_params, "lr_mode": "function", "lr_schedule_function": test_lr_function}
        trainer.train(model=model, training_params=training_params, train_loader=classification_test_dataloader(),
                      valid_loader=classification_test_dataloader())
        # test that we assert lr_function is callable
        training_params = {**self.training_params, "lr_mode": "function"}
        with self.assertRaises(AssertionError):
            trainer.train(model=model, training_params=training_params, train_loader=classification_test_dataloader(),
                          valid_loader=classification_test_dataloader())

    def test_cosine_lr(self):
        trainer, model = self.get_trainer(self.folder_name)
        training_params = {**self.training_params, "lr_mode": "cosine", "cosine_final_lr_ratio": 0.01}
        trainer.train(model=model, training_params=training_params, train_loader=classification_test_dataloader(),
                      valid_loader=classification_test_dataloader())

    def test_step_lr(self):
        trainer, model = self.get_trainer(self.folder_name)
        training_params = {**self.training_params, "lr_mode": "step", "lr_decay_factor": 0.1, "lr_updates": [4]}
        trainer.train(model=model, training_params=training_params, train_loader=classification_test_dataloader(),
                      valid_loader=classification_test_dataloader())


if __name__ == '__main__':
    unittest.main()