Add iterative search space example (#119)

* update readme in ga_squad

* update readme

* fix typo

* Update README.md

* Update README.md

* Update README.md

* update readme

* add iterative search space example

* update

* update readme

* change name

examples/trials/mnist-cascading-search-space/config.yml

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+authorName: default
+experimentName: mnist-cascading-search-space
+trialConcurrency: 2
+maxExecDuration: 1h
+maxTrialNum: 100
+#choice: local, remote
+trainingServicePlatform: local
+searchSpacePath: search_space.json
+#choice: true, false
+useAnnotation: false
+tuner:
+  #choice: TPE, Random, Anneal, Evolution
+  builtinTunerName: TPE
+  classArgs:
+    #choice: maximize, minimize
+    optimize_mode: maximize
+trial:
+  command: python3 mnist.py
+  codeDir: .
+  gpuNum: 0

examples/trials/mnist-cascading-search-space/mnist.py

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+'''
+mnist.py is an example to show: how to use iterative search space to tune architecture network for mnist.
+'''
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import argparse
+import codecs
+import json
+import logging
+import math
+import sys
+import tempfile
+import tensorflow as tf
+
+from tensorflow.examples.tutorials.mnist import input_data
+
+import nni
+
+
+logger = logging.getLogger('mnist_cascading_search_space')
+FLAGS = None
+
+class MnistNetwork(object):
+    def __init__(self, params, feature_size = 784):
+        config = []
+
+        for i in range(10):
+            config.append(params['layer'+str(i)])
+        self.config = config
+        self.feature_size = feature_size
+        self.label_size = 10
+
+
+    def is_expand_dim(self, input):
+        # input is a tensor
+        shape = len(input.get_shape().as_list())
+        if shape < 4:
+            return True
+        return False
+
+
+    def is_flatten(self, input):
+        # input is a tensor
+        shape = len(input.get_shape().as_list())
+        if shape > 2:
+            return True
+        return False
+
+
+    def get_layer(self, layer_config, input, in_height, in_width, id):
+        if layer_config[0] == 'Empty':
+            return input
+
+        if self.is_expand_dim(input):
+            input = tf.reshape(input, [-1, in_height, in_width, 1])
+        h, w = layer_config[1], layer_config[2]
+
+        if layer_config[0] == 'Conv':
+            conv_filter = tf.Variable(tf.random_uniform([h, w, 1, 1]), name='id_%d_conv_%d_%d' % (id, h, w))
+            return tf.nn.conv2d(input, filter=conv_filter, strides=[1, 1, 1, 1], padding='SAME')
+        if layer_config[0] == 'Max_pool':
+            return tf.nn.max_pool(input, ksize=[1, h, w, 1], strides=[1, 1, 1, 1], padding='SAME')
+        if layer_config[0] == 'Avg_pool':
+            return tf.nn.avg_pool(input, ksize=[1, h, w, 1], strides=[1, 1, 1, 1], padding='SAME')
+
+        print('error:', layer_config)
+        raise Exception('%s layer is illegal'%layer_config[0])
+
+
+    def build_network(self):
+        layer_configs = self.config
+        feature_size = 784
+
+        # define placeholder
+        self.x = tf.placeholder(tf.float32, [None, feature_size], name="input_x")
+        self.y = tf.placeholder(tf.int32, [None, self.label_size], name="input_y")
+        label_number = 10
+
+        # define network
+        input_layer = self.x
+        in_height = in_width = int(math.sqrt(feature_size))
+        for i, layer_config in enumerate(layer_configs):
+            input_layer = tf.nn.relu(self.get_layer(layer_config, input_layer, in_height, in_width, i))
+
+        output_layer = input_layer
+        if self.is_flatten(output_layer):
+            output_layer = tf.contrib.layers.flatten(output_layer)  # flatten
+        output_layer = tf.layers.dense(output_layer, label_number)
+        child_logit = tf.nn.softmax_cross_entropy_with_logits(logits=output_layer, labels=self.y)
+        child_loss = tf.reduce_mean(child_logit)
+
+        self.train_step = tf.train.AdamOptimizer(learning_rate=0.0001).minimize(child_loss)
+        child_accuracy = tf.equal(tf.argmax(output_layer, 1), tf.argmax(self.y, 1))
+        self.accuracy = tf.reduce_mean(tf.cast(child_accuracy, "float"))  # add a reduce_mean
+
+def main(params):
+    # Import data
+    mnist = input_data.read_data_sets(params['data_dir'], one_hot=True)
+
+    # Create the model
+    # Build the graph for the deep net
+    mnist_network = MnistNetwork(params)
+    mnist_network.build_network()
+    print('build network done.')
+
+    # Write log
+    graph_location = tempfile.mkdtemp()
+    #print('Saving graph to: %s' % graph_location)
+    train_writer = tf.summary.FileWriter(graph_location)
+    train_writer.add_graph(tf.get_default_graph())
+
+    test_acc = 0.0
+    with tf.Session() as sess:
+        sess.run(tf.global_variables_initializer())
+        for i in range(params['batch_num']):
+            batch = mnist.train.next_batch(params['batch_size'])
+            mnist_network.train_step.run(feed_dict={mnist_network.x: batch[0], mnist_network.y: batch[1]})
+
+            if i % 100 == 0:
+                train_accuracy = mnist_network.accuracy.eval(feed_dict={
+                    mnist_network.x: batch[0], mnist_network.y: batch[1]})
+                print('step %d, training accuracy %g' % (i, train_accuracy))
+
+        test_acc = mnist_network.accuracy.eval(feed_dict={
+            mnist_network.x: mnist.test.images, mnist_network.y: mnist.test.labels})
+
+        nni.report_final_result(test_acc)
+
+def generate_defualt_params():
+    params = {'data_dir': '/tmp/tensorflow/mnist/input_data',
+              'batch_num': 1000,
+              'batch_size': 200}
+    return params
+
+
+def parse_init_json(data):
+    params = {}
+    for key in data:
+        value = data[key]
+        if value == 'Empty':
+            params[key] = ['Empty']
+        else:
+            params[key] = [value[0], value[1]['_value'], value[1]['_value']]
+    return params
+
+
+if __name__ == '__main__':
+    try:
+        # get parameters form tuner
+        data = nni.get_parameters()
+        logger.debug(data)
+
+        RCV_PARAMS = parse_init_json(data)
+        logger.debug(RCV_PARAMS)
+        params = generate_defualt_params()
+        params.update(RCV_PARAMS)
+        print(RCV_PARAMS)
+
+        main(params)
+    except Exception as exception:
+        logger.exception(exception)
+        raise

examples/trials/mnist-cascading-search-space/requirments.txt

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+tensorflow >= 1.3
+six == 1.11.0
+numpy == 1.13.3

examples/trials/mnist-cascading-search-space/sample.json

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+{"layer2": "Empty", "layer8": ["Conv", {"_index": 0, "_value": 2}], "layer3": ["Avg_pool", {"_index": 2,     "_value": 5}], "layer0": ["Max_pool", {"_index": 2, "_value": 5}], "layer1": ["Conv", {"_index": 0, "_value": 2}], "layer6": ["Max_pool",     {"_index": 1, "_value": 3}], "layer7": ["Max_pool", {"_index": 2, "_value": 5}], "layer9": ["Conv", {"_index": 0, "_value": 2}], "layer4":     ["Avg_pool", {"_index": 1, "_value": 3}], "layer5": ["Avg_pool", {"_index": 2, "_value": 5}]}

examples/trials/mnist-cascading-search-space/search_space.json

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+{
+    "layer0":{"_type":"choice","_value":[
+		"Empty",
+		["Conv", {"_type":"choice","_value":[2,3,5]}],
+		["Max_pool", {"_type":"choice","_value":[2,3,5]}],
+		["Avg_pool", {"_type":"choice","_value":[2,3,5]}]
+	]},
+   "layer1":{"_type":"choice","_value":[
+		"Empty",
+		["Conv", {"_type":"choice","_value":[2,3,5]}],
+		["Max_pool", {"_type":"choice","_value":[2,3,5]}],
+		["Avg_pool", {"_type":"choice","_value":[2,3,5]}]
+	]},
+   "layer2":{"_type":"choice","_value":[
+		"Empty",
+		["Conv", {"_type":"choice","_value":[2,3,5]}],
+		["Max_pool", {"_type":"choice","_value":[2,3,5]}],
+		["Avg_pool", {"_type":"choice","_value":[2,3,5]}]
+	]},
+   "layer3":{"_type":"choice","_value":[
+		"Empty",
+		["Conv", {"_type":"choice","_value":[2,3,5]}],
+		["Max_pool", {"_type":"choice","_value":[2,3,5]}],
+		["Avg_pool", {"_type":"choice","_value":[2,3,5]}]
+	]},
+   "layer4":{"_type":"choice","_value":[
+		"Empty",
+		["Conv", {"_type":"choice","_value":[2,3,5]}],
+		["Max_pool", {"_type":"choice","_value":[2,3,5]}],
+		["Avg_pool", {"_type":"choice","_value":[2,3,5]}]
+	]},
+   "layer5":{"_type":"choice","_value":[
+		"Empty",
+		["Conv", {"_type":"choice","_value":[2,3,5]}],
+		["Max_pool", {"_type":"choice","_value":[2,3,5]}],
+		["Avg_pool", {"_type":"choice","_value":[2,3,5]}]
+	]},
+   "layer6":{"_type":"choice","_value":[
+		"Empty",
+		["Conv", {"_type":"choice","_value":[2,3,5]}],
+		["Max_pool", {"_type":"choice","_value":[2,3,5]}],
+		["Avg_pool", {"_type":"choice","_value":[2,3,5]}]
+	]},
+   "layer7":{"_type":"choice","_value":[
+		"Empty",
+		["Conv", {"_type":"choice","_value":[2,3,5]}],
+		["Max_pool", {"_type":"choice","_value":[2,3,5]}],
+		["Avg_pool", {"_type":"choice","_value":[2,3,5]}]
+	]},
+   "layer8":{"_type":"choice","_value":[
+		"Empty",
+		["Conv", {"_type":"choice","_value":[2,3,5]}],
+		["Max_pool", {"_type":"choice","_value":[2,3,5]}],
+		["Avg_pool", {"_type":"choice","_value":[2,3,5]}]
+	]},
+   "layer9":{"_type":"choice","_value":[
+		"Empty",
+		["Conv", {"_type":"choice","_value":[2,3,5]}],
+		["Max_pool", {"_type":"choice","_value":[2,3,5]}],
+		["Avg_pool", {"_type":"choice","_value":[2,3,5]}]
+	]}
+}