Add test_hyperopt_optuna_requeue_zombie_trials

test/hyperopt_test.py

@@ -1,5 +1,8 @@
 import os
 import importlib
+import sqlite3
+
+import optuna
 
 import mala
 import numpy as np
@@ -375,3 +378,126 @@ def __optimize_hyperparameters(hyper_optimizer):
         test_trainer.train_network()
         test_parameters.show()
         return test_trainer.final_test_loss
+
+    def test_hyperopt_optuna_requeue_zombie_trials(self, tmp_path):
+
+        ##tmp_path = os.environ["HOME"]
+
+        db_filename = f"{tmp_path}/test_ho.db"
+
+        # Set up parameters.
+        test_parameters = mala.Parameters()
+        test_parameters.data.data_splitting_type = "by_snapshot"
+        test_parameters.data.input_rescaling_type = "feature-wise-standard"
+        test_parameters.data.output_rescaling_type = "normal"
+        test_parameters.running.max_number_epochs = 2
+        test_parameters.running.mini_batch_size = 40
+        test_parameters.running.learning_rate = 0.00001
+        test_parameters.running.trainingtype = "Adam"
+        test_parameters.hyperparameters.n_trials = 2
+        test_parameters.hyperparameters.hyper_opt_method = "optuna"
+        test_parameters.hyperparameters.study_name = "test_ho"
+        test_parameters.hyperparameters.rdb_storage = (
+            f"sqlite:///{db_filename}"
+        )
+
+        # Load data.
+        data_handler = mala.DataHandler(test_parameters)
+        data_handler.add_snapshot(
+            "Be_snapshot0.in.npy",
+            data_path,
+            "Be_snapshot0.out.npy",
+            data_path,
+            "tr",
+        )
+        data_handler.add_snapshot(
+            "Be_snapshot1.in.npy",
+            data_path,
+            "Be_snapshot1.out.npy",
+            data_path,
+            "va",
+        )
+        data_handler.add_snapshot(
+            "Be_snapshot2.in.npy",
+            data_path,
+            "Be_snapshot2.out.npy",
+            data_path,
+            "te",
+        )
+        data_handler.prepare_data()
+
+        # Perform the hyperparameter optimization.
+        test_hp_optimizer = mala.HyperOpt(test_parameters, data_handler)
+        test_hp_optimizer.add_hyperparameter(
+            "float", "learning_rate", 0.0000001, 0.01
+        )
+        test_hp_optimizer.add_hyperparameter(
+            "int", "ff_neurons_layer_00", 10, 100
+        )
+        test_hp_optimizer.add_hyperparameter(
+            "int", "ff_neurons_layer_01", 10, 100
+        )
+        test_hp_optimizer.add_hyperparameter(
+            "categorical", "layer_activation_00", choices=["ReLU", "Sigmoid"]
+        )
+        test_hp_optimizer.add_hyperparameter(
+            "categorical", "layer_activation_01", choices=["ReLU", "Sigmoid"]
+        )
+        test_hp_optimizer.add_hyperparameter(
+            "categorical", "layer_activation_02", choices=["ReLU", "Sigmoid"]
+        )
+
+        def load_study():
+            return optuna.load_study(
+                study_name=test_parameters.hyperparameters.study_name,
+                storage=test_parameters.hyperparameters.rdb_storage,
+            )
+
+        # First run, create database.
+        test_hp_optimizer.perform_study()
+
+        assert (
+            test_hp_optimizer.study.trials_dataframe()["state"].to_list()
+            == ["COMPLETE"] * 2
+        )
+
+        # This is basically the same code as in requeue_zombie_trials() but it
+        # doesn't work. The trials here are FrozenTrial objects (in
+        # requeue_zombie_trials() as well!) and we get
+        #   RuntimeError: Trial#0 has already finished and can not be updated.
+        # However this code below in requeue_zombie_trials() *does* work. Why?
+        #
+        ##study = load_study()
+        ####study = test_hp_optimizer.study
+        ##for trial in study.get_trials():
+        ##    study._storage.set_trial_state_values(
+        ##        trial_id=trial._trial_id, state=optuna.trial.TrialState.RUNNING
+        ##    )
+
+        # Hack the db directly.
+        con = sqlite3.connect(db_filename)
+        cur = con.cursor()
+        cur.execute("update trials set state='RUNNING'")
+        con.commit()
+        con.close()
+
+        assert (
+            load_study().trials_dataframe()["state"].to_list()
+            == ["RUNNING"] * 2
+        )
+
+        test_hp_optimizer.requeue_zombie_trials(
+            study_name=test_parameters.hyperparameters.study_name,
+            rdb_storage=test_parameters.hyperparameters.rdb_storage,
+        )
+        assert (
+            load_study().trials_dataframe()["state"].to_list()
+            == ["WAITING"] * 2
+        )
+
+        # Second run adds one more trial.
+        test_hp_optimizer.perform_study()
+        assert (
+            test_hp_optimizer.study.trials_dataframe()["state"].to_list()
+            == ["COMPLETE"] * 3
+        )