LEARNING AUTHORS: MARTN ABADI, PAUL BARHAM, JIANMIN CHEN, ZHIFENG - PowerPoint PPT Presentation

Mar 19, 2023 •357 likes •544 views

TENSORFLOW: A SYSTEM FOR LARGE-SCALE MACHINE LEARNING AUTHORS: MARTN ABADI, PAUL BARHAM, JIANMIN CHEN, ZHIFENG CHEN, ANDY DAVIS, JEFFREY DEAN, MATTHIEU DEVIN, SANJAY GHEMAWAT, GEOFFREY IRVING, MICHAEL ISARD, MANJUNATH KUDLUR, JOSH LEVENBERG,

TENSORFLOW: A SYSTEM FOR LARGE-SCALE MACHINE LEARNING AUTHORS: MARTÍN ABADI, PAUL BARHAM, JIANMIN CHEN, ZHIFENG CHEN, ANDY DAVIS, JEFFREY DEAN, MATTHIEU DEVIN, SANJAY GHEMAWAT, GEOFFREY IRVING, MICHAEL ISARD, MANJUNATH KUDLUR, JOSH LEVENBERG, RAJAT MONGA, SHERRY MOORE, DEREK G. MURRAY, BENOIT STEINER, PAUL TUCKER, VIJAY VASUDEVAN, PETE WARDEN, MARTIN WICKE, YUAN YU, AND XIAOQIANG ZHENG
OVERVIEW • Large Scale ML System • Distributed Compute and Training • Multi-node • Heterogenous Environemnts • Dataflow Graphs • Open Source • Mathematically Flexible • Bespoke Loss & Kernels • Fault Tolerant
DATAFLOW GRAPHS Input 2 Input 1 Multiply Add Input 3 Mutability! Output
PRIOR WORK • DistBelief • Architecture • Parameter Server Worker • Workers • Inflexible Layers Parameter Worker Server • Inflexible Training Algorithms • RNNs, LSTMs, GCNs challenging Worker • Optimized for large clusters • Caffe & Theano • Similar TensorFlow is designed to improve flexibility!
DistBelief/Keras/Etc TensorFlow Input 1 Input 2 Input 1 Input 2 Dense Multiply Add Atomic Dense Multiply Add Output Output
ACCELERATOR ABSTRACTION CPU GPU TPU
UNITS OF TENSORFLOW • Graph • Subgraph Partitioned subgraphs are distributed to individual compute devices • Edges • Tensors Multidimensional arrays • Vertices • Operations Add, Multiply, Sigmoid • Automatic Partitioning • Subgraphs distributions maximize compute efficiency
CONTROL FLOW EXECUTION • Graph Partitioned and Distributed • Synchronous Execution • Classically frowned upon • Send + Recv Replace Split Edges • GPUs make appealing • Send • All workers forced to take same • Pushes value from one device to another parameters • Recv • Backup workers stochastically • Blocks until value available eliminate straggling processes • “Deferred execution”
DIFFERENTIATION & BACKPROP • Symbolic representation • Automatically computes backprop code • Like PS architectures, enables distributed training via +/- write operations
IMPLEMENTATION
SINGLE MACHINE BENCHMARKS
SPARSE AND DENSE FETCHES FOR SYNC
CNN IMPLEMENTATIONS
SYNC AND NON-SYNCED PROCESSES
TRAINING LARGE MODELS
CRITICISM • No actual accuracy comparisons • Convergence comparisons in synchrony analysis? • Lacking capability for abstracted computation • Reason why Keras runs on top of TF
CONCLUSION • Built a ML system that is: • Robust • Distributable • Extensible • Fast • In the ensuing years • Used extensively • Extended
REFERECES • TensorFlow: A System for Large-Scale Machine Learning TensorFlow: A system for large-scale machine learning. M. Abadi, P. Barham, J. Chen et al. 2016

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