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#! /usr/bin/python

# -*- coding: utf-8 -*-

"""Alpha Version for Distributed Training

you can test this example in your local machine using 2 workers and 1 ps like below,

where CUDA_VISIBLE_DEVICES can be used to set the GPUs the process can use.

CUDA_VISIBLE_DEVICES= TF_CONFIG='{"cluster": {"ps": ["127.0.0.1:3001"], "worker": ["127.0.0.1:3002", "127.0.0.1:3003"]}, "task": {"type": "worker", "index": 0}}' python example/tutorial_mnist_distributed.py > output-master 2>&1 &

CUDA_VISIBLE_DEVICES= TF_CONFIG='{"cluster": {"ps": ["127.0.0.1:3001"], "worker": ["127.0.0.1:3002", "127.0.0.1:3003"]}, "task": {"type": "worker", "index": 1}}' python example/tutorial_mnist_distributed.py > output-worker 2>&1 &

CUDA_VISIBLE_DEVICES= TF_CONFIG='{"cluster": {"ps": ["127.0.0.1:3001"], "worker": ["127.0.0.1:3002", "127.0.0.1:3003"]}, "task": {"type": "ps", "index": 0}}' python example/tutorial_mnist_distributed.py > output-ps 2>&1 &

Note: for GPU, please set CUDA_VISIBLE_DEVICES=GPU_ID

"""

import tensorflow as tf

import tensorlayer as tl

# load environment for distributed training

task_spec = tl.distributed.TaskSpec()

task_spec.create_server()

device_fn = task_spec.device_fn() if task_spec is not None else None

# prepare data

X_train, y_train, X_val, y_val, X_test, y_test = \

tl.files.load_mnist_dataset(shape=(-1,784))

# create graph

with tf.device(device_fn):

# define placeholder

x = tf.placeholder(tf.float32, shape=[None, 784], name='x')

y_ = tf.placeholder(tf.int64, shape=[None], name='y_')

# define the network

network = tl.layers.InputLayer(x, name='input')

network = tl.layers.DropoutLayer(network, keep=0.8, name='drop1')

network = tl.layers.DenseLayer(network, 800, tf.nn.relu, name='relu1')

network = tl.layers.DropoutLayer(network, keep=0.5, name='drop2')

network = tl.layers.DenseLayer(network, 800, tf.nn.relu, name='relu2')

network = tl.layers.DropoutLayer(network, keep=0.5, name='drop3')

# the softmax is implemented internally in tl.cost.cross_entropy(y, y_) to

# speed up computation, so we use identity here.

# see tf.nn.sparse_softmax_cross_entropy_with_logits()

network = tl.layers.DenseLayer(network, n_units=10, act=tf.identity, name='output')

# define cost function and metric.

y = network.outputs

cost = tl.cost.cross_entropy(y, y_, name='cost')

correct_prediction = tf.equal(tf.argmax(y, 1), y_)

acc = tf.reduce_mean(tf.cast(correct_prediction, tf.float32))

y_op = tf.argmax(tf.nn.softmax(y), 1)

# define the optimizer

train_params = network.all_params

train_op = tf.train.AdamOptimizer(learning_rate=0.0001).minimize(cost, var_list=train_params)

with tl.distributed.DistributedSession(task_spec=task_spec) as sess:

# print network information

if task_spec.is_master():

network.print_params(session=sess)

network.print_layers()

print_freq = 5

eval_train = False

else:

print_freq = 1000

eval_train = False

# We do not need to initialize the variables as the session does it

#tl.layers.initialize_global_variables(sess)

# train the network

tl.utils.fit(

sess,

network,

train_op,

cost,

X_train,

y_train,

x,

y_,

acc=acc,

batch_size=500,

n_epoch=500,

print_freq=print_freq,

X_val=X_val,

y_val=y_val,

eval_train=eval_train)

if task_spec.is_master():

# evaluation

tl.utils.test(sess, network, acc, X_test, y_test, x, y_, batch_size=None, cost=cost)

# save the network to .npz file

tl.files.save_npz(network.all_params, name='model.npz')