test_trial_runner_exception.py

import random
import time

import tensorflow as tf
from ray import tune


class ExperimentRunner(tune.Trainable):
    def _setup(self, variant):
        self.timestep = 0

    def _train(self):
        self.timestep += 1
        v = tf.tanh(float(self.timestep) / self.config.get("width", 1)).numpy()
        v *= self.config.get("height", 1)

        time.sleep(tf.random.uniform((), minval=0.1, maxval=2.0))

        if self.config['width'] == 10 and 2 < self.timestep:
            raise ValueError("Intentional exception to see if tune fails.")

        return {"episode_reward_mean": v}


def main():
    tune.run(
        ExperimentRunner,
        resources_per_trial={'cpu': 2},
        num_samples=1,
        stop={"training_iteration": 10},
        config={
            "width": tune.grid_search([10, 20, 30]),
            "height": tune.sample_from(lambda spec: int(100 * random.random())),
        },
        local_dir='/tmp/wandb-test',
    )


if __name__ == '__main__':
    main()