PyTorch for the IPU: User Guide

• 1. Introduction
  • 1.1. Data batching
  • 1.2. Parallel and Distributed execution
  • 1.3. Constraints
  • 1.4. Other resources
• 2. Installation
  • 2.1. Version compatibility
  • 2.2. Using a Python virtual environment
  • 2.3. Setting the environment variables
  • 2.4. Validating the setup
• 3. From PyTorch to PopTorch
  • 3.1. Preparing your data
  • 3.2. Creating your model
    • 3.2.1. Training
    • 3.2.2. Inference
  • 3.3. The training loop
  • 3.4. Multiple/custom losses
  • 3.5. Optimizers
  • 3.6. Going further
• 4. Features
  • 4.1. Options
    • 4.1.1. Setting options via config file
  • 4.2. Model wrapping functions
    • 4.2.1. poptorch.trainingModel
    • 4.2.2. poptorch.inferenceModel
    • 4.2.3. poptorch.PoplarExecutor
    • 4.2.4. poptorch.isRunningOnIpu
  • 4.3. Error handling
    • 4.3.1. Recoverable runtime errors
    • 4.3.2. Unrecoverable runtime errors
    • 4.3.3. Application and other errors
  • 4.4. Multi-IPU execution strategies
    • 4.4.1. Annotations
      • Model partitioning using blocks
      • poptorch.Stage and poptorch.AutoStage
      • poptorch.Phase
      • Advanced annotation with strings
    • 4.4.2. Available execution strategies
      • Pipelined execution
      • Sharded execution
      • Phased execution
    • 4.4.3. Grouping tensor weights across replicas
  • 4.5. Optimizers
    • 4.5.1. Loss scaling
    • 4.5.2. Velocity scaling (SGD combined variant only)
    • 4.5.3. Accumulation types
    • 4.5.4. Constant attributes
    • 4.5.5. Reading and writing optimizer state
  • 4.6. PopTorch ops
    • 4.6.1. poptorch.ctc_beam_search_decoder
    • 4.6.2. poptorch.ipu_print_tensor
    • 4.6.3. poptorch.identity_loss
    • 4.6.4. poptorch.MultiConv
    • 4.6.5. poptorch.nop
    • 4.6.6. poptorch.dynamic_slice
    • 4.6.7. poptorch.serializedMatMul
    • 4.6.8. poptorch.set_available_memory
    • 4.6.9. Miscellaneous functions
  • 4.7. 16-bit float support
  • 4.8. PyTorch buffers
  • 4.9. Creating custom ops
    • 4.9.1. Implementing the custom op
    • 4.9.2. Make the op available to PyTorch
    • 4.9.3. Passing attributes to the custom op
  • 4.10. Precompilation and caching
    • 4.10.1. Caching
    • 4.10.2. Precompilation
  • 4.11. Environment variables
    • 4.11.1. Logging level
    • 4.11.2. Profiling
    • 4.11.3. IPU Model
    • 4.11.4. Wait for an IPU to become available
    • 4.11.5. Enable executable caching
• 5. Efficient data batching
  • 5.1. poptorch.DataLoader
  • 5.2. poptorch.AsynchronousDataAccessor
    • 5.2.1. Rebatching iterable datasets
  • 5.3. poptorch.Options.deviceIterations
  • 5.4. poptorch.Options.replicationFactor
  • 5.5. poptorch.Options.inputReplicaGrouping
  • 5.6. poptorch.Options.Training.gradientAccumulation
  • 5.7. poptorch.Options.outputMode
• 6. IPU supported operations
  • 6.1. Torch operations
    • 6.1.1. Tensor operations
      • Creation ops
      • Indexing, slicing, joining and mutating ops
      • Random samplers
    • 6.1.2. Math operations
      • Pointwise ops
      • Reduction ops
      • Comparison ops
      • Other ops
      • BLAS and LAPACK Operations
  • 6.2. Torch.nn operations
    • 6.2.1. Containers
    • 6.2.2. Convolution layers
    • 6.2.3. Pooling layers
    • 6.2.4. Padding layers
    • 6.2.5. Activations
    • 6.2.6. Normalization layers
    • 6.2.7. Recurrent layers
    • 6.2.8. Linear layers
    • 6.2.9. Dropout
    • 6.2.10. Sparse layers
    • 6.2.11. Loss functions
    • 6.2.12. Vision Layers
  • 6.3. 16-bit float operations
  • 6.4. 16-bit float migration
  • 6.5. Gradient computation control
• 7. Debugging your model
  • 7.1. Inspecting tensors
  • 7.2. Anchoring tensors
  • 7.3. Retrieving tensors
  • 7.4. Inspecting optimiser state
• 8. Efficient IPU I/O
  • 8.1. Prefetch and Multibuffering
  • 8.2. Overlapping compute and I/O
• 9. Examples
  • 9.1. MNIST example
• 10. Experimental features
  • 10.1. Distributed execution without PopRun
  • 10.2. torch.nn.CTCLoss
• 11. API reference
  • 11.1. Options
  • 11.2. Helpers
  • 11.3. PopTorch Ops
  • 11.4. Model wrapping functions
  • 11.5. Parallel execution
  • 11.6. Optimizers
  • 11.7. Data batching
  • 11.8. Enumerations
• 12. Index
• 13. Trademarks & copyright