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  • TF-Slim: A high level library to define complex models in TensorFlow
    Posted by Nathan Silberman and Sergio Guadarrama, Google Research

    Earlier this year, we released a TensorFlow implementation of a state-of-the-art image classification model known as Inception-V3. This code allowed users to train the model on the ImageNet classification dataset via synchronized gradient descent, using either a single local machine or a cluster of machines. The Inception-V3 model was built on an experimental TensorFlow library called TF-Slim, a lightweight package for defining, training and evaluating models in TensorFlow. The TF-Slim library provides common abstractions which enable users to define models quickly and concisely, while keeping the model architecture transparent and its hyperparameters explicit.

    Since that release, TF-Slim has grown substantially, with many types of layers, loss functions, and evaluation metrics added, along with handy routines for training and evaluating models. These routines take care of all the details you need to worry about when working at scale, such as reading data in parallel, deploying models on multiple machines, and more. Additionally, we have created the TF-Slim Image Models library, which provides definitions and training scripts for many widely used image classification models, using standard datasets. TF-Slim and its components are already widely used within Google, and many of these improvements have already been integrated into tf.contrib.slim.

    Today, we are proud to share the latest release of TF-Slim with the TF community. Some highlights of this release include:
    Want to get started using TF-Slim? See the README for details. Interested in working with image classification models? See these instructions or this Jupyter notebook.

    The release of the TF-Slim library and the pre-trained model zoo has been the result of widespread collaboration within Google Research. In particular we want to highlight the vital contributions of the following researchers:
    • TF-Slim: Sergio Guadarrama, Nathan Silberman.
    • Model Definitions and Checkpoints: Christian Szegedy, Sergey Ioffe, Vincent Vanhoucke, Jon Shlens, Zbigniew Wojna, Vivek Rathod, George Papandreou, Alex Alemi
    • Systems Infrastructure: Jon Shlens, Matthieu Devin, Martin Wicke
    • Jupyter notebook: Nathan Silberman, Kevin Murphy
    References:
    [1] Going deeper with convolutions, Christian Szegedy, Wei Liu, Yangqing Jia, Pierre Sermanet, Scott Reed, Dragomir Anguelov, Dumitru Erhan, Vincent Vanhoucke, Andrew Rabinovich, CVPR 2015
    [2] Batch Normalization: Accelerating Deep Network Training by Reducing Internal Covariate Shift Sergey Ioffe, Christian Szegedy, ICML 2015
    [3] Rethinking the Inception Architecture for Computer Vision, Christian Szegedy, Vincent Vanhoucke, Sergey Ioffe, Jonathon Shlens, Zbigniew Wojna, arXiv technical report 2015
    [4] Very Deep Convolutional Networks for Large-Scale Image Recognition, Karen Simonyan, Andrew Zisserman, ICLR 2015
    [5] ImageNet Classification with Deep Convolutional Neural Networks, Alex Krizhevsky, Ilya Sutskever, Geoffrey E. Hinton, NIPS 2012
    [6] Deep Residual Learning for Image Recognition, Kaiming He, Xiangyu Zhang, Shaoqing Ren, Jian Sun, CVPR 2016


  • Text summarization with TensorFlow
    Posted by Peter Liu, Software Engineer, Google Brain Team

    Every day, people rely on a wide variety of sources to stay informed -- from news stories to social media posts to search results. Being able to develop Machine Learning models that can automatically deliver accurate summaries of longer text can be useful for digesting such large amounts of information in a compressed form, and is a long-term goal of the Google Brain team.

    Summarization can also serve as an interesting reading comprehension test for machines. To summarize well, machine learning models need to be able to comprehend documents and distill the important information, tasks which are highly challenging for computers, especially as the length of a document increases.

    In an effort to push this research forward, we’re open-sourcing TensorFlow model code for the task of generating news headlines on Annotated English Gigaword, a dataset often used in summarization research. We also specify the hyper-parameters in the documentation that achieve better than published state-of-the-art on the most commonly used metric as of the time of writing. Below we also provide samples generated by the model.

    Extractive and Abstractive summarization

    One approach to summarization is to extract parts of the document that are deemed interesting by some metric (for example, inverse-document frequency) and join them to form a summary. Algorithms of this flavor are called extractive summarization.
    Original Text: Alice and Bob took the train to visit the zoo. They saw a baby giraffe, a lion, and a flock of colorful tropical birds. 
    Extractive Summary: Alice and Bob visit the zoo. saw a flock of birds.
    Above we extract the words bolded in the original text and concatenate them to form a summary. As we can see, sometimes the extractive constraint can make the summary awkward or grammatically strange.

    Another approach is to simply summarize as humans do, which is to not impose the extractive constraint and allow for rephrasings. This is called abstractive summarization.
    Abstractive summary: Alice and Bob visited the zoo and saw animals and birds.
    In this example, we used words not in the original text, maintaining more of the information in a similar amount of words. It’s clear we would prefer good abstractive summarizations, but how could an algorithm begin to do this?

    About the TensorFlow model

    It turns out for shorter texts, summarization can be learned end-to-end with a deep learning technique called sequence-to-sequence learning, similar to what makes Smart Reply for Inbox possible. In particular, we’re able to train such models to produce very good headlines for news articles. In this case, the model reads the article text and writes a suitable headline.

    To get an idea of what the model produces, you can take a look at some examples below. The first column shows the first sentence of a news article which is the model input, and the second column shows what headline the model has written.

    Input: Article 1st sentence
    Model-written headline
    metro-goldwyn-mayer reported a third-quarter net loss of dlrs 16 million due mainly to the effect of accounting rules adopted this year
    mgm reports 16 million net loss on higher revenue
    starting from july 1, the island province of hainan in southern china will implement strict market access control on all incoming livestock and animal products to prevent the possible spread of epidemic diseases
    hainan to curb spread of diseases
    australian wine exports hit a record 52.1 million liters worth 260 million dollars (143 million us) in september, the government statistics office reported on monday
    australian wine exports hit record high in september

    Future Research

    We’ve observed that due to the nature of news headlines, the model can generate good headlines from reading just a few sentences from the beginning of the article. Although this task serves as a nice proof-of-concept, we started looking at more difficult datasets where reading the entire document is necessary to produce good summaries. In those tasks training from scratch with this model architecture does not do as well as some other techniques we’re researching, but it serves as a baseline. We hope this release can also serve as a baseline for others in their summarization research.


  • Meet Parsey’s Cousins: Syntax for 40 languages, plus new SyntaxNet capabilities
    Posted by Chris Alberti, Dave Orr & Slav Petrov, Google Natural Language Understanding Team

    Just in time for ACL 2016, we are pleased to announce that Parsey McParseface, released in May as part of SyntaxNet and the basis for the Cloud Natural Language API, now has 40 cousins! Parsey’s Cousins is a collection of pretrained syntactic models for 40 languages, capable of analyzing the native language of more than half of the world’s population at often unprecedented accuracy. To better address the linguistic phenomena occurring in these languages we have endowed SyntaxNet with new abilities for Text Segmentation and Morphological Analysis.

    When we released Parsey, we were already planning to expand to more languages, and it soon became clear that this was both urgent and important, because researchers were having trouble creating top notch SyntaxNet models for other languages.

    The reason for that is a little bit subtle. SyntaxNet, like other TensorFlow models, has a lot of knobs to turn, which affect accuracy and speed. These knobs are called hyperparameters, and control things like the learning rate and its decay, momentum, and random initialization. Because neural networks are more sensitive to the choice of these hyperparameters than many other machine learning algorithms, picking the right hyperparameter setting is very important. Unfortunately there is no tested and proven way of doing this and picking good hyperparameters is mostly an empirical science -- we try a bunch of settings and see what works best.

    An additional challenge is that training these models can take a long time, several days on very fast hardware. Our solution is to train many models in parallel via MapReduce, and when one looks promising, train a bunch more models with similar settings to fine-tune the results. This can really add up -- on average, we train more than 70 models per language. The plot below shows how the accuracy varies depending on the hyperparameters as training progresses. The best models are up to 4% absolute more accurate than ones trained without hyperparameter tuning.
    Held-out set accuracy for various English parsing models with different hyperparameters (each line corresponds to one training run with specific hyperparameters). In some cases training is a lot slower and in many cases a suboptimal choice of hyperparameters leads to significantly lower accuracy. We are releasing the best model that we were able to train for each language.
    In order to do a good job at analyzing the grammar of other languages, it was not sufficient to just fine-tune our English setup. We also had to expand the capabilities of SyntaxNet. The first extension is a model for text segmentation, which is the task of identifying word boundaries. In languages like English, this isn’t very hard -- you can mostly look for spaces and punctuation. In Chinese, however, this can be very challenging, because words are not separated by spaces. To correctly analyze dependencies between Chinese words, SyntaxNet needs to understand text segmentation -- and now it does.
    Analysis of a Chinese string into a parse tree showing dependency labels, word tokens, and parts of speech (read top to bottom for each word token).
    The second extension is a model for morphological analysis. Morphology is a language feature that is poorly represented in English. It describes inflection: i.e., how the grammatical function and meaning of the word changes as its spelling changes. In English, we add an -s to a word to indicate plurality. In Russian, a heavily inflected language, morphology can indicate number, gender, whether the word is the subject or object of a sentence, possessives, prepositional phrases, and more. To understand the syntax of a sentence in Russian, SyntaxNet needs to understand morphology -- and now it does.
    Parse trees showing dependency labels, parts of speech, and morphology.
    As you might have noticed, the parse trees for all of the sentences above look very similar. This is because we follow the content-head principle, under which dependencies are drawn between content words, with function words becoming leaves in the parse tree. This idea was developed by the Universal Dependencies project in order to increase parallelism between languages. Parsey’s Cousins are trained on treebanks provided by this project and are designed to be cross-linguistically consistent and thus easier to use in multi-lingual language understanding applications.

    Using the same set of labels across languages can help us understand how sentences in different languages, or variations in the same language, convey the same meaning. In all of the above examples, the root indicates the main verb of the sentence and there is a passive nominal subject (indicated by the arc labeled with ‘nsubjpass’) and a passive auxiliary (‘auxpass’). If you look closely, you will also notice some differences because the grammar of each language differs. For example, English uses the preposition ‘by,’ where Russian uses morphology to mark that the phrase ‘the publisher (издателем)’ is in instrumental case -- the meaning is the same, it is just expressed differently.

    Google has been involved in the Universal Dependencies project since its inception and we are very excited to be able to bring together our efforts on datasets and modeling. We hope that this release will facilitate research progress in building computer systems that can understand all of the world’s languages.

    Parsey's Cousins can be found on GitHub, along with Parsey McParseface and SyntaxNet.


  • ACL 2016 & Research at Google
    Posted by Slav Petrov, Research Scientist

    This week, Berlin hosts the 2016 Annual Meeting of the Association for Computational Linguistics (ACL 2016), the premier conference of the field of computational linguistics, covering a broad spectrum of diverse research areas that are concerned with computational approaches to natural language. As a leader in Natural Language Processing (NLP) and a Platinum Sponsor of the conference, Google will be on hand to showcase research interests that include syntax, semantics, discourse, conversation, multilingual modeling, sentiment analysis, question answering, summarization, and generally building better learners using labeled and unlabeled data, state-of-the-art modeling, and learning from indirect supervision.

    Our systems are used in numerous ways across Google, impacting user experience in search, mobile, apps, ads, translate and more. Our work spans the range of traditional NLP tasks, with general-purpose syntax and semantic algorithms underpinning more specialized systems.
    Our researchers are experts in natural language processing and machine learning, and combine methodological research with applied science, and our engineers are equally involved in long-term research efforts and driving immediate applications of our technology.

    If you’re attending ACL 2016, we hope that you’ll stop by the booth to check out some demos, meet our researchers and discuss projects and opportunities at Google that go into solving interesting problems for billions of people. Learn more about Google research being presented at ACL 2016 below (Googlers highlighted in blue), and visit the Natural Language Understanding Team page at g.co/NLUTeam.

    Papers
    Generalized Transition-based Dependency Parsing via Control Parameters
    Bernd Bohnet, Ryan McDonald, Emily Pitler, Ji Ma

    Learning the Curriculum with Bayesian Optimization for Task-Specific Word Representation Learning
    Yulia Tsvetkov, Manaal Faruqui, Wang Ling (Google DeepMind), Chris Dyer (Google DeepMind)

    Morpho-syntactic Lexicon Generation Using Graph-based Semi-supervised Learning (TACL)
    Manaal Faruqui, Ryan McDonald, Radu Soricut

    Many Languages, One Parser (TACL)
    Waleed Ammar, George Mulcaire, Miguel Ballesteros, Chris Dyer (Google DeepMind)*, Noah A. Smith

    Latent Predictor Networks for Code Generation
    Wang Ling (Google DeepMind), Phil Blunsom (Google DeepMind), Edward Grefenstette (Google DeepMind), Karl Moritz Hermann (Google DeepMind), Tomáš Kočiský (Google DeepMind), Fumin Wang (Google DeepMind), Andrew Senior (Google DeepMind)

    Collective Entity Resolution with Multi-Focal Attention
    Amir Globerson, Nevena Lazic, Soumen Chakrabarti, Amarnag Subramanya, Michael Ringgaard, Fernando Pereira

    Plato: A Selective Context Model for Entity Resolution (TACL)
    Nevena Lazic, Amarnag Subramanya, Michael Ringgaard, Fernando Pereira

    WikiReading: A Novel Large-scale Language Understanding Task over Wikipedia
    Daniel Hewlett, Alexandre Lacoste, Llion Jones, Illia Polosukhin, Andrew Fandrianto, Jay Han, Matthew Kelcey, David Berthelot

    Stack-propagation: Improved Representation Learning for Syntax
    Yuan Zhang, David Weiss

    Cross-lingual Models of Word Embeddings: An Empirical Comparison
    Shyam Upadhyay, Manaal Faruqui, Chris Dyer (Google DeepMind)Dan Roth

    Globally Normalized Transition-Based Neural Networks (Outstanding Papers Session)
    Daniel Andor, Chris Alberti, David Weiss, Aliaksei Severyn, Alessandro Presta, Kuzman GanchevSlav Petrov, Michael Collins

    Posters
    Cross-lingual projection for class-based language models
    Beat Gfeller, Vlad Schogol, Keith Hall

    Synthesizing Compound Words for Machine Translation
    Austin Matthews, Eva Schlinger*, Alon Lavie, Chris Dyer (Google DeepMind)*

    Cross-Lingual Morphological Tagging for Low-Resource Languages
    Jan Buys, Jan A. Botha

    Workshops
    1st Workshop on Representation Learning for NLP
    Keynote Speakers include: Raia Hadsell (Google DeepMind)
    Workshop Organizers include: Edward Grefenstette (Google DeepMind), Phil Blunsom (Google DeepMind), Karl Moritz Hermann (Google DeepMind)
    Program Committee members include: Tomáš Kočiský (Google DeepMind), Wang Ling (Google DeepMind), Ankur Parikh (Google), John Platt (Google), Oriol Vinyals (Google DeepMind)

    1st Workshop on Evaluating Vector-Space Representations for NLP
    Contributed Papers:
    Problems With Evaluation of Word Embeddings Using Word Similarity Tasks
    Manaal Faruqui, Yulia Tsvetkov, Pushpendre Rastogi, Chris Dyer (Google DeepMind)*

    Correlation-based Intrinsic Evaluation of Word Vector Representations
    Yulia Tsvetkov, Manaal Faruqui, Chris Dyer (Google DeepMind)

    SIGFSM Workshop on Statistical NLP and Weighted Automata
    Contributed Papers:
    Distributed representation and estimation of WFST-based n-gram models
    Cyril Allauzen, Michael Riley, Brian Roark

    Pynini: A Python library for weighted finite-state grammar compilation
    Kyle Gorman


    * Work completed at CMU


  • Computational Thinking for All Students
    Posted by Maggie Johnson, Director of Education and University Relations, Google

    (Crossposted on the Google for Education Blog, and the the Huffington Post)

    Last year, I wrote about the importance of teaching computational thinking to all K-12 students. Given the growing use of computing, algorithms and data in all fields from the humanities to medicine to business, it’s becoming increasingly important for students to understand the basics of computer science (CS). One lesson we have learned through Google’s CS education outreach efforts is that these skills can be accessible to all students, if we introduce them early in K-5. These are truly 21st century skills which can, over time, produce a workforce ready for a technology-enabled and driven economy.

    How can teachers start introducing computational thinking in early school curriculum? It is already present in many topic areas - algorithms for solving math problems, for example. However, what is often missing in current examples of computational thinking is the explicit connection between what students are learning and its application in computing. For example, once a student has mastered adding multi-digit numbers, the following algorithm could be presented:
    1. Add together the digits in the ones place. If the result is < 10, it becomes the ones digit of the answer. If it's >= 10 or greater, the ones digit of the result becomes the ones digit of the answer, and you add 1 to the next column.
    2. Add together the digits in the tens place, plus the 1 carried over from the ones place, if necessary. If the answer < than 10, it becomes the tens digit of the answer; if it's >= 10, the ones digit becomes the tens digit of the answer and 1 is added to the next column.
    3. Repeat this process for any additional columns until they are all added.
    This allows a teacher to present the concept of an algorithm and its use in computing, as well as the most important elements of any computer program: conditional branching (“if the result is less than 10…”) and iteration (“repeat this process…”). Going a step farther, a teacher translating the algorithm into a running program can have a compelling effect. When something that students have used to solve an instance of a problem can automatically solve all instances of the that problem, it’s quite a powerful moment for them even if they don’t do the coding themselves.

    Google has created an online course for K-12 teachers to learn about computational thinking and how to make these explicit connections for their students. We also have a large repository of lessons, explorations and programs to support teachers and students. Our videos illustrate real-world examples of the application of computational thinking in Google’s products and services, and we have compiled a set of great resources showing how to integrate computational thinking into existing curriculum. We also recently announced Project Bloks to engage younger children in computational thinking. Finally, code.org, for whom Google is a primary sponsor, has curriculum and materials for K-5 teachers and students.

    We feel that computational thinking is a core skill for all students. If we can make these explicit connections for students, they will see how the devices and apps that they use everyday are powered by algorithms and programs. They will learn the importance of data in making decisions. They will learn skills that will prepare them for a workforce that will be doing vastly different tasks than the workforce of today. We owe it to all students to give them every possible opportunity to be productive and successful members of society.


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