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Deep Learning with Python & TensorFlow

Ian Lewis
September 26, 2016

Deep Learning with Python & TensorFlow

Python has lots of scientific, data analysis, and machine learning libraries. But there are many problems. Which do you use? How do they compare to each other? How can you use a model that has been trained in your production application?

TensorFlow is a new Open Source framework created at Google for building Deep Learning applications. Tensorflow allows you to construct easy to understand data flow graphs which form a mathematical and logical pipeline. Creating data flow graphs allow easier visualization of complicated algorithms as well as running the training operations over multiple hardware GPUs.

Tensorflow data flow graphs and operations are written in Python. In this talk I will discuss how you can use TensorFlow to create Deep Learning applications. I will discuss how it compares to other Python machine learning libraries like Theano or Chainer. Finally, I will discuss how trained TensorFlow models could be deployed into a production system using TensorFlow Serve.

Ian Lewis

September 26, 2016

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  8. Confidential & Proprietary Google Cloud Platform 8

  9. Google Cloud Platform 9 (x,y,z,?,?,?,?,...)

  10. Google Cloud Platform 10 v[x] => vector

  11. Google Cloud Platform 11 m[x][y][z] => matrix

  12. Google Cloud Platform 12 t[x][y][z][?][?]... => tensor

  13. Google Cloud Platform 13

  14. Confidential & Proprietary Google Cloud Platform 14

  15. Confidential & Proprietary Google Cloud Platform 15 Breakthroughs

  16. Google Cloud Platform 16 The Inception model (GoogLeNet, 2015)

  17. From: Andrew Ng

  18. DNN = a large matrix ops a few GPUs >>

    CPU (but it still takes hours/days to train) a supercomputer >> a few GPUs (but you don't have a supercomputer) You need Distributed Training
  19. None
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  21. Confidential & Proprietary Google Cloud Platform 21 TensorFlow

  22. 22 Google's open source library for machine intelligence tensorflow.org launched

    in Nov 2015 The second generation Used by many production ML projects What is Tensorflow?
  23. 23 Operates over tensors: n-dimensional arrays Using a flow graph:

    data flow computation framework TensorFlow • Flexible, intuitive construction • automatic differentiation • Support for threads, queues, and asynchronous computation; distributed runtime • Train on CPUs, GPUs • Run wherever you like
  24. Google Cloud Platform 24 Core TensorFlow data structures and concepts...

    - Graph: A TensorFlow computation, represented as a dataflow graph. - collection of ops that may be executed together as a group - Operation: a graph node that performs computation on tensors - Tensor: a handle to one of the outputs of an Operation - provides a means of computing the value in a TensorFlow Session.
  25. Google Cloud Platform 25 Core TensorFlow data structures and concepts

    - Constants - Placeholders: must be fed with data on execution - Variables: a modifiable tensor that lives in TensorFlow's graph of interacting operations. - Session: encapsulates the environment in which Operation objects are executed, and Tensor objects are evaluated.
  26. Google Cloud Platform 26 Category Element-wise math ops Array ops

    Matrix ops Stateful ops NN building blocks Checkpointing ops Queue & synch ops Control flow ops Operations Examples Add, Sub, Mul, Div, Exp, Log, Greater, Less… Concat, Slice, Split, Constant, Rank, Shape… MatMul, MatrixInverse, MatrixDeterminant… Variable, Assign, AssignAdd... SoftMax, Sigmoid, ReLU, Convolution2D… Save, Restore Enqueue, Dequeue, MutexAcquire… Merge, Switch, Enter, Leave...
  27. Google Cloud Platform 27

  28. Distributed Training with TensorFlow

  29. • CPU/GPU scheduling • Communications ◦ Local, RPC, RDMA ◦

    32/16/8 bit quantization • Cost-based optimization • Fault tolerance Distributed Training with TensorFlow
  30. Distributed Training Model Parallelism Sub-Graph • Allows fine grained application

    of parallelism to slow graph components • Larger more complex graph Full Graph • Code is more similar to single process models • Not necessarily as performant (large models) Data Parallelism Synchronous • Prevents workers from “Falling behind” • Workers progress at the speed of the slowest worker Asynchronous • Workers advance as fast as they can • Can result in runs that aren’t reproducible or difficult to debug behavior (large models)
  31. Fully managed, distributed training and prediction for custom TensorFlow graph

    Supports Regression and Classification initially Integrated with Cloud Dataflow and Cloud Datalab Limited Preview - cloud.google.com/ml Cloud Machine Learning (Cloud ML)
  32. Jeff Dean's keynote: YouTube video Define a custom TensorFlow graph

    Training at local: 8.3 hours w/ 1 node Training at cloud: 32 min w/ 20 nodes (15x faster) Prediction at cloud at 300 reqs / sec Cloud ML
  33. Tensor Processing Unit ASIC for TensorFlow Designed by Google 10x

    better perf / watt 8 bit quantization
  34. Confidential & Proprietary Google Cloud Platform 34 Thank You https://www.tensorflow.org/

    https://cloud.google.com/ml/ http://bit.ly/tensorflow-workshop Ian Lewis @IanMLewis