PyTorch 1.7.0 Now Available

PyTorch 1.7.0 Now Available

PyTorch is a open source deep learning platform used for easily writing neural network layers in Python. PyTorch 1.7.0, has a number of new highlights including CUDA 11, New APIs for FFTs, Windows support for Distributed training and more. Check out the newest release v1.7.0!

PyTorch 1.7.0

PyTorch is a widely used, open source deep learning platform used for easily writing neural network layers in Python enabling a seamless workflow from research to production. Based on Torch, PyTorch has become a powerful machine learning framework favored by esteemed researchers around the world.

The newest stable release of PyTorch, version 1.7.0, has a number of new highlights including CUDA 11, New APIs for FFTs, Windows support for Distributed training and more.

PyTorch 1.7.0 Release Notes

  • Highlights
  • Backwards Incompatible Change
  • New Features
  • Improvements
  • Performance
  • Documentation

Highlights

The PyTorch 1.7 release includes a number of new APIs including support for NumPy-Compatible FFT operations, profiling tools and major updates to both distributed data parallel (DDP) and remote procedure call (RPC) based distributed training. In addition, several features moved to stable including custom C++ Classes, the memory profiler, the creation of custom tensor-like objects, user async functions in RPC and a number of other features in torch.distributed such as Per-RPC timeout, DDP dynamic bucketing and RRef helper.

A few of the highlights include:

  • CUDA 11 is now officially supported with binaries available at PyTorch.org
  • Updates and additions to profiling and performance for RPC, TorchScript and Stack traces in the autograd profiler
  • (Beta) Support for NumPy compatible Fast Fourier transforms (FFT) via torch.fft
  • (Prototype) Support for Nvidia A100 generation GPUs and native TF32 format
  • (Prototype) Distributed training on Windows now supported

To reiterate, starting PyTorch 1.6, features are now classified as stable, beta and prototype. You can see the detailed announcement here. Note that the prototype features listed in this blog are available as part of this release.

Front End APIs

[Beta] NumPy Compatible torch.fft module

FFT-related functionality is commonly used in a variety of scientific fields like signal processing. While PyTorch has historically supported a few FFT-related functions, the 1.7 release adds a new torch.fft module that implements FFT-related functions with the same API as NumPy.

This new module must be imported to be used in the 1.7 release, since its name conflicts with the historic (and now deprecated) torch.fft function.

Example usage:

>>> import torch.fft>>> t = torch.arange(4)>>> ttensor([0, 1, 2, 3]) >>> torch.fft.fft(t)tensor([ 6.+0.j, -2.+2.j, -2.+0.j, -2.-2.j]) >>> t = tensor([0.+1.j, 2.+3.j, 4.+5.j, 6.+7.j])>>> torch.fft.fft(t)tensor([12.+16.j, -8.+0.j, -4.-4.j, 0.-8.j])
  • Documentation | Link

[Beta] C++ Support for Transformer NN Modules

Since PyTorch 1.5, we’ve continued to maintain parity between the python and C++ frontend APIs. This update allows developers to use the nn.transformer module abstraction from the C++ Frontend. And moreover, developers no longer need to save a module from python/JIT and load into C++ as it can now be used it in C++ directly.

  • Documentation | Link

[Beta] torch.set_deterministic

Reproducibility (bit-for-bit determinism) may help identify errors when debugging or testing a program. To facilitate reproducibility, PyTorch 1.7 adds the torch.set_deterministic(bool) function that can direct PyTorch operators to select deterministic algorithms when available, and to throw a runtime error if an operation may result in nondeterministic behavior. By default, the flag this function controls is false and there is no change in behavior, meaning PyTorch may implement its operations nondeterministically by default.

More precisely, when this flag is true:

  • Operations known to not have a deterministic implementation throw a runtime error;
  • Operations with deterministic variants use those variants (usually with a performance penalty versus the non-deterministic version); and
  • torch.backends.cudnn.deterministic = True is set.

Note that this is necessary, but not sufficient, for determinism within a single run of a PyTorch program. Other sources of randomness like random number generators, unknown operations, or asynchronous or distributed computation may still cause nondeterministic behavior.

See the documentation for torch.set_deterministic(bool) for the list of affected operations.

Performance & Profiling

[Beta] Stack traces added to profiler

Users can now see not only operator name/inputs in the profiler output table but also where the operator is in the code. The workflow requires very little change to take advantage of this capability. The user uses the autograd profiler as before but with optional new parameters: with_stack and group_by_stack_n. Caution: regular profiling runs should not use this feature as it adds significant overhead.

Distributed Training & RPC

[Stable] TorchElastic now bundled into PyTorch docker image

Torchelastic offers a strict superset of the current torch.distributed.launch CLI with the added features for fault-tolerance and elasticity. If the user is not be interested in fault-tolerance, they can get the exact functionality/behavior parity by setting max_restarts=0 with the added convenience of auto-assigned RANK and MASTER_ADDR|PORT (versus manually specified in torch.distributed.launch).

By bundling torchelastic in the same docker image as PyTorch, users can start experimenting with torchelastic right-away without having to separately install torchelastic. In addition to convenience, this work is a nice-to-have when adding support for elastic parameters in the existing Kubeflow’s distributed PyTorch operators.

  • Usage examples and how to get started | Link

[Beta] Support for uneven dataset inputs in DDP

PyTorch 1.7 introduces a new context manager to be used in conjunction with models trained using torch.nn.parallel.DistributedDataParallel to enable training with uneven dataset size across different processes. This feature enables greater flexibility when using DDP and prevents the user from having to manually ensure dataset sizes are the same across different process. With this context manager, DDP will handle uneven dataset sizes automatically, which can prevent errors or hangs at the end of training.

[Beta] NCCL Reliability – Async Error/Timeout Handling

In the past, NCCL training runs would hang indefinitely due to stuck collectives, leading to a very unpleasant experience for users. This feature will abort stuck collectives and throw an exception/crash the process if a potential hang is detected. When used with something like torchelastic (which can recover the training process from the last checkpoint), users can have much greater reliability for distributed training. This feature is completely opt-in and sits behind an environment variable that needs to be explicitly set in order to enable this functionality (otherwise users will see the same behavior as before).

[Beta] TorchScript remote and rpc_sync

torch.distributed.rpc.rpc_async has been available in TorchScript in prior releases. For PyTorch 1.7, this functionality will be extended the remaining two core RPC APIs, torch.distributed.rpc.rpc_sync and torch.distributed.rpc.remote. This will complete the major RPC APIs targeted for support in TorchScript, it allows users to use the existing python RPC APIs within TorchScript (in a script function or script method, which releases the python Global Interpreter Lock) and could possibly improve application performance in multithreaded environment.

  • Documentation | Link
  • Usage examples | Link

[Beta] Distributed optimizer with TorchScript support

PyTorch provides a broad set of optimizers for training algorithms, and these have been used repeatedly as part of the python API. However, users often want to use multithreaded training instead of multiprocess training as it provides better resource utilization and efficiency in the context of large scale distributed training (e.g. Distributed Model Parallel) or any RPC-based training application). Users couldn’t do this with with distributed optimizer before because we need to get rid of the python Global Interpreter Lock (GIL) limitation to achieve this.

In PyTorch 1.7, we are enabling the TorchScript support in distributed optimizer to remove the GIL, and make it possible to run optimizer in multithreaded applications. The new distributed optimizer has the exact same interface as before but it automatically converts optimizers within each worker into TorchScript to make each GIL free. This is done by leveraging a functional optimizer concept and allowing the distributed optimizer to convert the computational portion of the optimizer into TorchScript. This will help use cases like distributed model parallel training and improve performance using multithreading.

Currently, the only optimizer that supports automatic conversion with TorchScript is Adagrad and all other optimizers will still work as before without TorchScript support. We are working on expanding the coverage to all PyTorch optimizers and expect more to come in future releases. The usage to enable TorchScript support is automatic and exactly the same with existing python APIs, here is an example of how to use this:

import torch.distributed.autograd as dist_autogradimport torch.distributed.rpc as rpcfrom torch import optimfrom torch.distributed.optim import DistributedOptimizer with dist_autograd.context() as context_id: ## Forward pass. rref1 = rpc.remote(“worker1”, torch.add, args=(torch.ones(2), 3)) rref2 = rpc.remote(“worker1”, torch.add, args=(torch.ones(2), 1)) loss = rref1.to_here() + rref2.to_here() ## Backward pass. dist_autograd.backward(context_id, [loss.sum()]) ## Optimizer, pass in optim.Adagrad, DistributedOptimizer will ## automatically convert/compile it to TorchScript (GIL-free) dist_optim = DistributedOptimizer( optim.Adagrad, [rref1, rref2], lr=0.05, ) dist_optim.step(context_id)

[Beta] Enhancements to RPC-based Profiling

Support for using the PyTorch profiler in conjunction with the RPC framework was first introduced in PyTorch 1.6. In PyTorch 1.7, the following enhancements have been made:

  • Implemented better support for profiling TorchScript functions over RPC
  • Achieved parity in terms of profiler features that work with RPC
  • Added support for asynchronous RPC functions on the server-side (functions decorated with rpc.functions.async_execution).

User are now able to use familiar profiling tools such as with torch.autograd.profiler.profile() and with torch.autograd.profiler.record_function, and this works transparently with the RPC framework with full feature support, profiles asynchronous functions, and TorchScript functions.

  • Design doc | Link
  • Usage examples | Link

[Prototype] Windows support for Distributed Training

PyTorch 1.7 brings prototype support for DistributedDataParallel and collective communications on the Windows platform. In this release, the support only covers Gloo-based ProcessGroup and FileStore.

To use this feature across multiple machines, please provide a file from a shared file system in init_process_group.

initialize the process groupdist.init_process_group( “gloo”, ## multi-machine example: ## Shared files need six “/” ## init_method = ”file://////{machine}/{share_folder}/file” ## Local file need three “/” init_method=”file:///{your local file path}”, rank=rank, world_size=world_size) model = DistributedDataParallel(local_model, device_ids=[rank])

Mobile

PyTorch Mobile supports both iOS and Android with binary packages available in Cocoapods and JCenter respectively. You can learn more about PyTorch-Mobile here.

[Beta] PyTorch Mobile Caching allocator for performance improvements

On some mobile platforms, such as Pixel, we observed that memory is returned to the system more aggressively. This results in frequent page faults as PyTorch being a functional framework does not maintain state for the operators. Thus outputs are allocated dynamically on each execution of the op, for the most ops. To ameliorate performance penalties due to this, PyTorch 1.7 provides a simple caching allocator for CPU. The allocator caches allocations by tensor sizes and, is currently, available only via the PyTorch C++ API. The caching allocator itself is owned by client and thus the lifetime of the allocator is also maintained by client code. Such a client owned caching allocator can then be used with scoped guard, c10::WithCPUCachingAllocatorGuard, to enable the use of cached allocation within that scope.

Example usage:

#include <c10/mobile/CPUCachingAllocator.h>…..c10::CPUCachingAllocator caching_allocator; // Owned by client code. Can be a member of some client class so as to tie the // the lifetime of caching allocator to that of the class……{ c10::optionalc10::WithCPUCachingAllocatorGuard caching_allocator_guard; if (FLAGS_use_caching_allocator) { caching_allocator_guard.emplace(&caching_allocator); } …. model.forward(..);}…..

NOTE: Caching allocator is only available on mobile builds, thus the use of caching allocator outside of mobile builds won’t be effective.

  • Documentation | Link
  • Usage examples | Link

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