forked from 626_privacy/tensorflow_privacy
179 lines
7 KiB
Python
179 lines
7 KiB
Python
# Copyright 2015 The TensorFlow Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# =============================================================================
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"""Training a deep NN on IMDB reviews with differentially private Adam optimizer."""
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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 tensorflow as tf
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from scipy.stats import norm
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from tensorflow_privacy.privacy.analysis.rdp_accountant import compute_rdp
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from tensorflow_privacy.privacy.analysis.rdp_accountant import get_privacy_spent
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from tensorflow_privacy.privacy.optimizers import dp_optimizer
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from GDprivacy_accountants import *
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from keras.preprocessing import sequence
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#### FLAGS
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tf.flags.DEFINE_boolean('dpsgd', True, 'If True, train with DP-SGD. If False, '
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'train with vanilla SGD.')
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tf.flags.DEFINE_float('learning_rate', 0.02, 'Learning rate for training')
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tf.flags.DEFINE_float('noise_multiplier', 0.56,
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'Ratio of the standard deviation to the clipping norm')
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tf.flags.DEFINE_float('l2_norm_clip', 1, 'Clipping norm')
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tf.flags.DEFINE_integer('epochs', 25, 'Number of epochs')
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tf.flags.DEFINE_integer('max_mu', 2, 'GDP upper limit')
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tf.flags.DEFINE_string('model_dir', None, 'Model directory')
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FLAGS = tf.flags.FLAGS
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microbatches=512
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np.random.seed(0)
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tf.set_random_seed(0)
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max_features = 10000
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# cut texts after this number of words (among top max_features most common words)
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maxlen = 256
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def rnn_model_fn(features, labels, mode):
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# Define CNN architecture using tf.keras.layers.
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input_layer = tf.reshape(features['x'], [-1,maxlen])
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y = tf.keras.layers.Embedding(max_features,16).apply(input_layer)
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y=tf.keras.layers.GlobalAveragePooling1D().apply(y)
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y= tf.keras.layers.Dense(16, activation='relu').apply(y)
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logits= tf.keras.layers.Dense(2).apply(y)
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# Calculate loss as a vector (to support microbatches in DP-SGD).
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vector_loss = tf.nn.sparse_softmax_cross_entropy_with_logits(
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labels=labels, logits=logits)
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# Define mean of loss across minibatch (for reporting through tf.Estimator).
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scalar_loss = tf.reduce_mean(vector_loss)
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# Configure the training op (for TRAIN mode).
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if mode == tf.estimator.ModeKeys.TRAIN:
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if FLAGS.dpsgd:
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# Use DP version of GradientDescentOptimizer. Other optimizers are
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# available in dp_optimizer. Most optimizers inheriting from
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# tf.train.Optimizer should be wrappable in differentially private
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# counterparts by calling dp_optimizer.optimizer_from_args().
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optimizer = dp_optimizer.DPAdamGaussianOptimizer(
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l2_norm_clip=FLAGS.l2_norm_clip,
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noise_multiplier=FLAGS.noise_multiplier,
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num_microbatches=microbatches,
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learning_rate=FLAGS.learning_rate)
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opt_loss = vector_loss
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else:
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optimizer = tf.train.AdamOptimizer(
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learning_rate=FLAGS.learning_rate)
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opt_loss = scalar_loss
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global_step = tf.train.get_global_step()
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train_op = optimizer.minimize(loss=opt_loss, global_step=global_step)
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# In the following, we pass the mean of the loss (scalar_loss) rather than
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# the vector_loss because tf.estimator requires a scalar loss. This is only
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# used for evaluation and debugging by tf.estimator. The actual loss being
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# minimized is opt_loss defined above and passed to optimizer.minimize().
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return tf.estimator.EstimatorSpec(mode=mode,
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loss=scalar_loss,
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train_op=train_op)
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# Add evaluation metrics (for EVAL mode).
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elif mode == tf.estimator.ModeKeys.EVAL:
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eval_metric_ops = {
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'accuracy':
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tf.metrics.accuracy(
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labels=labels,
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predictions=tf.argmax(input=logits, axis=1))
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}
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return tf.estimator.EstimatorSpec(mode=mode,
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loss=scalar_loss,
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eval_metric_ops=eval_metric_ops)
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def load_imdb():
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(train_data,train_labels), (test_data,test_labels) = tf.keras.datasets.imdb.load_data(num_words=max_features)
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train_data = sequence.pad_sequences(train_data, maxlen=maxlen).astype('float32')
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test_data = sequence.pad_sequences(test_data, maxlen=maxlen).astype('float32')
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return train_data,train_labels,test_data,test_labels
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def main(unused_argv):
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tf.logging.set_verbosity(3)
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# Load training and test data.
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train_data,train_labels,test_data,test_labels = load_imdb()
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# Instantiate the tf.Estimator.
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imdb_classifier = tf.estimator.Estimator(model_fn=rnn_model_fn,
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model_dir=FLAGS.model_dir)
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# Create tf.Estimator input functions for the training and test data.
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eval_input_fn = tf.estimator.inputs.numpy_input_fn(
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x={'x': test_data},
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y=test_labels,
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num_epochs=1,
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shuffle=False)
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# Training loop.
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steps_per_epoch = 25000 // 512
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test_accuracy_list = []
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for epoch in range(1, FLAGS.epochs + 1):
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np.random.seed(epoch)
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for step in range(steps_per_epoch):
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tf.set_random_seed(0)
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whether=np.random.random_sample(25000)>(1-512/25000)
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subsampling=[i for i in np.arange(25000) if whether[i]]
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global microbatches
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microbatches=len(subsampling)
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train_input_fn = tf.estimator.inputs.numpy_input_fn(
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x={'x': train_data[subsampling]},
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y=train_labels[subsampling],
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batch_size=len(subsampling),
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num_epochs=1,
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shuffle=False)
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# Train the model for one step.
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imdb_classifier.train(input_fn=train_input_fn, steps=1)
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# Evaluate the model and print results
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eval_results = imdb_classifier.evaluate(input_fn=eval_input_fn)
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test_accuracy = eval_results['accuracy']
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test_accuracy_list.append(test_accuracy)
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print('Test accuracy after %d epochs is: %.3f' % (epoch, test_accuracy))
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# Compute the privacy budget expended so far.
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if FLAGS.dpsgd:
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eps = compute_epsP(epoch,FLAGS.noise_multiplier,25000,512,1e-5)
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mu= compute_muP(epoch,FLAGS.noise_multiplier,25000,512)
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print('For delta=1e-5, the current epsilon is: %.2f' % eps)
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print('For delta=1e-5, the current mu is: %.2f' % mu)
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if mu>FLAGS.max_mu:
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break
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else:
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print('Trained with vanilla non-private SGD optimizer')
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if __name__ == '__main__':
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tf.app.run()
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