TensorLayer is a deep learning library based on Google TensorFlow. It provides rich data pre-processing, training, post-processing and serving modules that help researchers and engineers in building complex machine learning workflows.

What's New

You can now use TensorLayer with TF-Slim and Keras together!
Compatible with TensorFlow 1.0 release.

Why TensorLayer

TensorLayer grow out from our need to combine the power of TensorFlow with the right deep learning modules in crafting diverse machine learning workflows. It is architected by the following design principles:

Simplicity: TensorLayer lifts the dataflow paradigm of TensorFlow to abstracted DL and RL modules. These modules come with detailed examples that can be deployed in minutes. A TensorLayer user may find it easy to bootstrap with our abstracted modules, and then dive into implementation if need.
Composibility: If possible, deep learning modules should be composed, not built. By offering connectors to TF-Slim and Keras, TensorLayer can be used to glue existing pieces together. This yields a much better time to explore ideas and allows easy plug-in of new modules.
Flexibility: A DL workflow usually require many careful tunings. TensorLayer allows users to manipulate the native APIs of TensorFlow and therefore have a flexible control of the engine.
Performance: TensorLayer provides zero-cost compatibility for TensorFlow. It can easily run on heterogeneous platforms or multiple servers without compromise in performance.

A frequent question regarding TensorLayer is that why don't we use existing libraries like Keras and Tflearn. A DL scientist may find it comfortable to start with these libraries. They provide abstractions to lower adoption barrier; but in turn hide the underlying engine. Though good for bootstrap, it becomes hard to tune and modify from the bottom, which is quite necessary in tackling many real-world problems.

In contrast, TensorLayer advocates a more flexible and composable approach where neural network libraries shall be used interchangeably with the native engine. This allows users to enjoy the power of pre-built modules without sacrificing control of the engine. This noninvasive nature makes it viable to consolidate with other TF's libraries such as TF-Slim and Keras. However, flexibility does not always come with the loss of performance. TensorLayer allows seamless distributed and heterogeneous deployment with its zero-cost compatibility to TensorFlow.

TensorLayer is in an active development stage and has received many contributions from an opend community. We are excited to hear about your thoughts and anticipate collaborations to promote its future. :)

Installation

TensorLayer has install prerequisites including TensorFlow, numpy and matplotlib. For GPU support, CUDA and cuDNN are required. Please check here for detailed instructions.

If you already had the pre-requisites ready (numpy, scipy, scikit-image, matplotlib and nltk(optional)), the simplest way to install TensorLayer in your python program is:

[for master version] pip install git+https://github.com/zsdonghao/tensorlayer.git (Highly Recommended)
[for stable version] pip install tensorlayer

Your First Program

The first program trains a multi-layer perception network to solve the MNIST problem. We use the well-known scikit-style functions such as fit() and test(). The program is self-explained.

import tensorflow as tf
import tensorlayer as tl

sess = tf.InteractiveSession()

# Prepare data
X_train, y_train, X_val, y_val, X_test, y_test = tl.files.load_mnist_dataset(shape=(-1,784))

# Define placeholder
x = tf.placeholder(tf.float32, shape=[None, 784], name='x')
y_ = tf.placeholder(tf.int64, shape=[None, ], name='y_')

# Define the neural network structure
network = tl.layers.InputLayer(x, name='input_layer')
network = tl.layers.DropoutLayer(network, keep=0.8, name='drop1')
network = tl.layers.DenseLayer(network, n_units=800, act = tf.nn.relu, name='relu1')
network = tl.layers.DropoutLayer(network, keep=0.5, name='drop2')
network = tl.layers.DenseLayer(network, n_units=800, act = 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_layer')
                                
# Define cost function and metric.
y = network.outputs
cost = tl.cost.cross_entropy(y, y_, '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, beta1=0.9, beta2=0.999,
                            epsilon=1e-08, use_locking=False).minimize(cost, var_list=train_params)

# Initialize all variables in the session
tl.layers.initialize_global_variables(sess)

# Print network information
network.print_params()
network.print_layers()

# Train the network, we recommend to use tl.iterate.minibatches()
tl.utils.fit(sess, network, train_op, cost, X_train, y_train, x, y_,
            acc=acc, batch_size=500, n_epoch=500, print_freq=5,
            X_val=X_val, y_val=y_val, eval_train=False)

# 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')

sess.close()

We provide many helper functions (like fit() , test()) that is similar to Keras to facilitate your development; however, if you want to obtain a fine-grain control over the model or its training process, you can use TensorFlow’s methods like sess.run() in your program directly (tutorial_mnist.py provides more details about this). Many more DL and RL examples can be found here.

Tricks to use TL is also a good introduction to use TensorLayer.

Documentation

The documentation [Online] [PDF] [Epub] [HTML] describes the usages of TensorLayer APIs. It is also a self-contained document that walks through different types of deep neural networks, reinforcement learning and their applications in Natural Language Processing (NLP) problems.

We have included the corresponding modularized implementations of Google TensorFlow Deep Learning tutorial, so you can read the TensorFlow tutorial [en] [cn] along with our document.

Chinese documentation is also available.

More Examples

Note

TensorLayer provides two set of Convolutional layer APIs, see (Professional)and (Simplified) on readthedocs website.
If you get into trouble, you can start a discussion on Gitter, Help Wanted Issues, QQ group and Wechat group.

Basics

Multi-layer perceptron (MNIST). A multi-layer perceptron implementation for MNIST classification task, see tutorial_mnist_simple.py.

Computer Vision

Denoising Autoencoder (MNIST). A multi-layer perceptron implementation for MNIST classification task, see tutorial_mnist.py.
Stacked Denoising Autoencoder and Fine-Tuning (MNIST). A multi-layer perceptron implementation for MNIST classification task, see tutorial_mnist.py.
Convolutional Network (MNIST). A Convolutional neural network implementation for classifying MNIST dataset, see tutorial_mnist.py.
Convolutional Network (CIFAR-10). A Convolutional neural network implementation for classifying CIFAR-10 dataset, see tutorial_cifar10.py and tutorial_cifar10_tfrecord.py.
VGG 16 (ImageNet). A Convolutional neural network implementation for classifying ImageNet dataset, see tutorial_vgg16.py.
VGG 19 (ImageNet). A Convolutional neural network implementation for classifying ImageNet dataset, see tutorial_vgg19.py.
InceptionV3 (ImageNet). A Convolutional neural network implementation for classifying ImageNet dataset, see tutorial_inceptionV3_tfslim.py.
Wide ResNet (CIFAR) by ritchieng.
More CNN implementations of TF-Slim can be connected to TensorLayer via SlimNetsLayer.

Natural Language Processing

Recurrent Neural Network (LSTM). Apply multiple LSTM to PTB dataset for language modeling, see tutorial_ptb_lstm_state_is_tuple.py.
Word Embedding - Word2vec. Train a word embedding matrix, see tutorial_word2vec_basic.py.
Restore Embedding matrix. Restore a pre-train embedding matrix, see tutorial_generate_text.py.
Text Generation. Generates new text scripts, using LSTM network, see tutorial_generate_text.py.
Machine Translation (WMT). Translate English to French. Apply Attention mechanism and Seq2seq to WMT English-to-French translation data, see tutorial_translate.py.

Reinforcement Learning

Deep Reinforcement Learning - Pong Game. Teach a machine to play Pong games, see tutorial_atari_pong.py.

Applications

Image Captioning - Reimplementation of Google's im2txt by zsdonghao.
DCGAN - Generating images by Deep Convolutional Generative Adversarial Networks by zsdonghao.
A simple web service - TensorFlask by JoelKronander

Special Examples

Merge TF-Slim into TensorLayer. tutorial_inceptionV3_tfslim.py.
Merge Keras into TensorLayer. tutorial_keras.py.
MultiplexerLayer. tutorial_mnist_multiplexer.py.
Data augmentation with TFRecord. Effective way to load and pre-process data, see tutorial_tfrecord*.py and tutorial_cifar10_tfrecord.py.
Data augmentation with TensorLayer, see tutorial_image_preprocess.py.

License

TensorLayer is releazed under the Apache 2.0 license.

Contribution Guideline

TensorLayer is a major ongoing research project in Data Science Institute, Imperial College London. TensorLayer contributors are from Imperial College, Tsinghua University, Carnegie Mellon University, Google, Microsoft, Bloomberg and etc. The goal of the project is to develop a compositional language while complex learning systems can be build through composition of neural network modules. The whole development is now participated by numerous contributors here.

🇬🇧 If you are in London, we can discuss in person. Drop us an email to organize a meetup: tensorlayer@gmail.com.
🇨🇳 我们有官方的中文文档。另外, 我们建立了多种交流渠道，如QQ 群和微信群*（申请入群时请star该项目，并告知github用户名）*. 需加入微信群，请将个人介绍和微信号发送到 tensorlayer@gmail.com.
🇹🇭 เราขอเรียนเชิญนักพัฒนาคนไทยทุกคนที่สนใจจะเข้าร่วมทีมพัฒนา TensorLayer ติดต่อสอบถามรายละเอียดเพิ่มเติมได้ที่ tensorlayer@gmail.com.

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