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https://github.com/wassname/ray.git
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Robert Nishihara
be4a37bf37
* Remove start_ray_local from ray.init and change default number of workers to 10. * Remove alexnet example. * Move array methods to experimental. * Remove TRPO example. * Remove old files. * Compile plasma when we build numbuf. * Address comments.
90 lines
3.6 KiB
Python
90 lines
3.6 KiB
Python
# Most of the tensorflow code is adapted from Tensorflow's tutorial on using CNNs to train MNIST
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# https://www.tensorflow.org/versions/r0.9/tutorials/mnist/pros/index.html#build-a-multilayer-convolutional-network
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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import numpy as np
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import ray
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import argparse
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import tensorflow as tf
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from tensorflow.examples.tutorials.mnist import input_data
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import hyperopt
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parser = argparse.ArgumentParser(description="Run the hyperparameter optimization example.")
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parser.add_argument("--trials", default=2, type=int, help="The number of random trials to do.")
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parser.add_argument("--steps", default=10, type=int, help="The number of steps of training to do per network.")
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if __name__ == "__main__":
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args = parser.parse_args()
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ray.init(num_workers=10)
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# The number of sets of random hyperparameters to try.
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trials = args.trials
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# The number of training passes over the dataset to use for network.
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steps = args.steps
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# Load the mnist data and turn the data into remote objects.
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print("Downloading the MNIST dataset. This may take a minute.")
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mnist = input_data.read_data_sets("MNIST_data", one_hot=True)
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train_images = ray.put(mnist.train.images)
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train_labels = ray.put(mnist.train.labels)
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validation_images = ray.put(mnist.validation.images)
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validation_labels = ray.put(mnist.validation.labels)
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# Keep track of the best parameters and the best accuracy.
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best_params = None
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best_accuracy = 0
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# This list holds the object IDs for all of the experiments that we have
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# launched and that have not yet been processed.
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remaining_ids = []
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# This is a dictionary mapping the object ID of an experiment to the
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# parameters used for that experiment.
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params_mapping = {}
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# A function for generating random hyperparameters.
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def generate_random_params():
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learning_rate = 10 ** np.random.uniform(-5, 5)
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batch_size = np.random.randint(1, 100)
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dropout = np.random.uniform(0, 1)
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stddev = 10 ** np.random.uniform(-5, 5)
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return {"learning_rate": learning_rate, "batch_size": batch_size, "dropout": dropout, "stddev": stddev}
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# Randomly generate some hyperparameters, and launch a task for each set.
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for i in range(trials):
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params = generate_random_params()
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accuracy_id = hyperopt.train_cnn_and_compute_accuracy.remote(params, steps, train_images, train_labels, validation_images, validation_labels)
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remaining_ids.append(accuracy_id)
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# Keep track of which parameters correspond to this experiment.
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params_mapping[accuracy_id] = params
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# Fetch and print the results of the tasks in the order that they complete.
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for i in range(trials):
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# Use ray.wait to get the object ID of the first task that completes.
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ready_ids, remaining_ids = ray.wait(remaining_ids)
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# Process the output of this task.
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result_id = ready_ids[0]
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params = params_mapping[result_id]
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accuracy = ray.get(result_id)
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print("""We achieve accuracy {:.3}% with
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learning_rate: {:.2}
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batch_size: {}
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dropout: {:.2}
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stddev: {:.2}
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""".format(100 * accuracy, params["learning_rate"], params["batch_size"], params["dropout"], params["stddev"]))
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if accuracy > best_accuracy:
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best_params = params
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best_accuracy = accuracy
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# Record the best performing set of hyperparameters.
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print("""Best accuracy over {} trials was {:.3} with
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learning_rate: {:.2}
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batch_size: {}
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dropout: {:.2}
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stddev: {:.2}
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""".format(trials, 100 * best_accuracy, best_params["learning_rate"], best_params["batch_size"], best_params["dropout"], best_params["stddev"]))
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