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https://github.com/vale981/ray
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e96acc26f7
* Fix MNIST downloading problems in parameter server examples. * Improve seeding. * Fixes.
76 lines
2.4 KiB
Python
76 lines
2.4 KiB
Python
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 argparse
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import numpy as np
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import ray
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import model
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parser = argparse.ArgumentParser(description="Run the synchronous parameter "
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"server example.")
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parser.add_argument("--num-workers", default=4, type=int,
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help="The number of workers to use.")
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parser.add_argument("--redis-address", default=None, type=str,
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help="The Redis address of the cluster.")
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@ray.remote
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class ParameterServer(object):
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def __init__(self, learning_rate):
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self.net = model.SimpleCNN(learning_rate=learning_rate)
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def apply_gradients(self, *gradients):
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self.net.apply_gradients(np.mean(gradients, axis=0))
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return self.net.variables.get_flat()
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def get_weights(self):
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return self.net.variables.get_flat()
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@ray.remote
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class Worker(object):
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def __init__(self, worker_index, batch_size=50):
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self.worker_index = worker_index
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self.batch_size = batch_size
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self.mnist = model.download_mnist_retry(seed=worker_index)
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self.net = model.SimpleCNN()
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def compute_gradients(self, weights):
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self.net.variables.set_flat(weights)
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xs, ys = self.mnist.train.next_batch(self.batch_size)
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return self.net.compute_gradients(xs, ys)
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if __name__ == "__main__":
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args = parser.parse_args()
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ray.init(redis_address=args.redis_address)
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# Create a parameter server.
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net = model.SimpleCNN()
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ps = ParameterServer.remote(1e-4 * args.num_workers)
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# Create workers.
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workers = [Worker.remote(worker_index)
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for worker_index in range(args.num_workers)]
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# Download MNIST.
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mnist = model.download_mnist_retry()
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i = 0
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current_weights = ps.get_weights.remote()
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while True:
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# Compute and apply gradients.
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gradients = [worker.compute_gradients.remote(current_weights)
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for worker in workers]
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current_weights = ps.apply_gradients.remote(*gradients)
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if i % 10 == 0:
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# Evaluate the current model.
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net.variables.set_flat(ray.get(current_weights))
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test_xs, test_ys = mnist.test.next_batch(1000)
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accuracy = net.compute_accuracy(test_xs, test_ys)
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print("Iteration {}: accuracy is {}".format(i, accuracy))
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i += 1
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