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Copyright © 2017 Google 1
Implementing the TensorFlow
Deep Learning Framework on
Qualcomm’s Low-power DSP
Pete Warden
May 2017
Copyright © 2017 Google 2
• Google’s open source library for machine intelligence
• tensorflow.org launched in Nov 2015
• Used by many production ML projects
2
Copyright © 2017 Google 3
TensorFlow and HVX
Copyright © 2017 Google 4
• Models run 8X faster, and use 1.4 watts versus ~5 watts on CPU
TensorFlow supports Qualcomm’s Hexagon DSP
Qualcomm Snapdragon 820 Processor
featuring the Hexagon DSP
DragonBoard 820c
Copyright © 2017 Google 5
• Started with my Embedded Vision Alliance talk last year
• “Eight bits are enough”
• Became clear from conversations with Qualcomm that there were
possibilities with their existing hardware in the Snapdragon 820
How did this happen?
Copyright © 2017 Google 6
• Qualcomm implemented a quick sanity test using gemmlowp, our
open source math library
• That demonstrated 100 GOPs/second on realistic workloads using
the HVX
• More than 5x speed of CPU
• Power usage expected to be much lower
Next Steps
Copyright © 2017 Google 7
• Gemmlowp project has m, n, k values for InceptionV1 matrix multiplies
Benchmark Details
https://github.com/google/gemmlowp/blob/master/test/benchmark.cc#L283
Copyright © 2017 Google 8
• Gemmlowp results indicated around 200 GOPs/s
(versus 25 GOPs/s on CPU)
• End to end turned out to be around 90 ms, versus 700 ms on CPU
• Was a good predictor of performance
Results
8
Copyright © 2017 Google 9
TensorFlow code is at
https://github.com/tensorflow/tensorflow/tree/master/tensorflow/contrib/hvx
Qualcomm code is
https://source.codeaurora.org/quic/hexagon_nn/nnlib
Copyright © 2017 Google 10
• Works by assembling a batch of ops on the CPU
• Then sends them off to HVX via FastRPC
• HVX runs it within its own code loop
• Signals the AP when it's done
Copyright © 2017 Google 11
• TensorFlow handles splitting up the graph between HVX and CPU
• Same mechanism is available for other accelerators too
Copyright © 2017 Google 12
Copyright © 2017 Google 13
Copyright © 2017 Google 14
Copyright © 2017 Google 15
Embedded TensorFlow
Copyright © 2017 Google 16
We work closely with chip builders
Copyright © 2017 Google 17
• Examples
• ARM’s Compute Library
• Movidius’s mvTensor tool
• CEVA’s conversion tools
• Intel’s contributions to https://github.com/google/gemmlowp
• Qualcomm’s HVX collaboration
We work closely with chip builders
Copyright © 2017 Google 18
Why?
Copyright © 2017 Google 19
• Mobile App Developers (including Snapchat)
• Device builders
• Home
• Drones
• Industrial
• Medical
• Automotive
Lots of demand
Copyright © 2017 Google 20
• Full support for eight bit
• Full stack: researchers, data centers, mobile apps, embedded devices
• Main framework at Google
• Shipping for vision on many apps, including PhotoScan and Snapchat
What’s TensorFlow particularly good at?
Copyright © 2017 Google 21
• Support for eight-bit training
• On-device training (already being used by Google Keyboard)
• Better export pipeline (Graph Transform Tool)
• Raspberry Pi
• Jetson TX1 experimental support
• Other chips?
• Many more examples
Embedded TensorFlow Roadmap
Copyright © 2017 Google 22
• ARM and Intel added code to https://github.com/google/gemmlowp
• Worked with many others to support TensorFlow file format for conversion
pipelines
• We’re always open to conversations about our requirements and porting
Collaborations with hardware vendors
Copyright © 2017 Google 23
• TensorFlow hands-on training class from the Embedded Vision Alliance,
July 13 in Santa Clara
• We’re always looking for chips, tools, systems companies to collaborate
with
• Please get in touch!
• petewarden@google.com
Future

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"Implementing the TensorFlow Deep Learning Framework on Qualcomm’s Low-power DSP," a Presentation from Google

  • 1. Copyright © 2017 Google 1 Implementing the TensorFlow Deep Learning Framework on Qualcomm’s Low-power DSP Pete Warden May 2017
  • 2. Copyright © 2017 Google 2 • Google’s open source library for machine intelligence • tensorflow.org launched in Nov 2015 • Used by many production ML projects 2
  • 3. Copyright © 2017 Google 3 TensorFlow and HVX
  • 4. Copyright © 2017 Google 4 • Models run 8X faster, and use 1.4 watts versus ~5 watts on CPU TensorFlow supports Qualcomm’s Hexagon DSP Qualcomm Snapdragon 820 Processor featuring the Hexagon DSP DragonBoard 820c
  • 5. Copyright © 2017 Google 5 • Started with my Embedded Vision Alliance talk last year • “Eight bits are enough” • Became clear from conversations with Qualcomm that there were possibilities with their existing hardware in the Snapdragon 820 How did this happen?
  • 6. Copyright © 2017 Google 6 • Qualcomm implemented a quick sanity test using gemmlowp, our open source math library • That demonstrated 100 GOPs/second on realistic workloads using the HVX • More than 5x speed of CPU • Power usage expected to be much lower Next Steps
  • 7. Copyright © 2017 Google 7 • Gemmlowp project has m, n, k values for InceptionV1 matrix multiplies Benchmark Details https://github.com/google/gemmlowp/blob/master/test/benchmark.cc#L283
  • 8. Copyright © 2017 Google 8 • Gemmlowp results indicated around 200 GOPs/s (versus 25 GOPs/s on CPU) • End to end turned out to be around 90 ms, versus 700 ms on CPU • Was a good predictor of performance Results 8
  • 9. Copyright © 2017 Google 9 TensorFlow code is at https://github.com/tensorflow/tensorflow/tree/master/tensorflow/contrib/hvx Qualcomm code is https://source.codeaurora.org/quic/hexagon_nn/nnlib
  • 10. Copyright © 2017 Google 10 • Works by assembling a batch of ops on the CPU • Then sends them off to HVX via FastRPC • HVX runs it within its own code loop • Signals the AP when it's done
  • 11. Copyright © 2017 Google 11 • TensorFlow handles splitting up the graph between HVX and CPU • Same mechanism is available for other accelerators too
  • 12. Copyright © 2017 Google 12
  • 13. Copyright © 2017 Google 13
  • 14. Copyright © 2017 Google 14
  • 15. Copyright © 2017 Google 15 Embedded TensorFlow
  • 16. Copyright © 2017 Google 16 We work closely with chip builders
  • 17. Copyright © 2017 Google 17 • Examples • ARM’s Compute Library • Movidius’s mvTensor tool • CEVA’s conversion tools • Intel’s contributions to https://github.com/google/gemmlowp • Qualcomm’s HVX collaboration We work closely with chip builders
  • 18. Copyright © 2017 Google 18 Why?
  • 19. Copyright © 2017 Google 19 • Mobile App Developers (including Snapchat) • Device builders • Home • Drones • Industrial • Medical • Automotive Lots of demand
  • 20. Copyright © 2017 Google 20 • Full support for eight bit • Full stack: researchers, data centers, mobile apps, embedded devices • Main framework at Google • Shipping for vision on many apps, including PhotoScan and Snapchat What’s TensorFlow particularly good at?
  • 21. Copyright © 2017 Google 21 • Support for eight-bit training • On-device training (already being used by Google Keyboard) • Better export pipeline (Graph Transform Tool) • Raspberry Pi • Jetson TX1 experimental support • Other chips? • Many more examples Embedded TensorFlow Roadmap
  • 22. Copyright © 2017 Google 22 • ARM and Intel added code to https://github.com/google/gemmlowp • Worked with many others to support TensorFlow file format for conversion pipelines • We’re always open to conversations about our requirements and porting Collaborations with hardware vendors
  • 23. Copyright © 2017 Google 23 • TensorFlow hands-on training class from the Embedded Vision Alliance, July 13 in Santa Clara • We’re always looking for chips, tools, systems companies to collaborate with • Please get in touch! • petewarden@google.com Future