Pytorch-ignite

Bug fixes:

- **BC-breaking** Moved detach outside of loss function computation (1675, 1692)
- Added eps to avoid nans in canberra error (1699)
- Removed size limitation for str on collective ops (1702)
- Fixed imports in docker images and now install Pillow-SIMD (1638, 1639, 1628, 1711)

Doc improvements

- 1645, 1653, 1654, 1671, 1672, 1691, 1687, 1686, 1685, 1684, 1676, 1688

Other improvements

- Fixed artifacts urls for pypi (1629)

---
Acknowledgments

🎉 Thanks to our community and all our contributors for the issues, PRs and 🌟 ⭐️ 🌟 !
💯 We really appreciate your implication into the project (in alphabetical order):

Devanshu24, KickItLikeShika, Moh-Yakoub, OBITORASU, ahmedo42, fco-dv, sparkingdark, touqir14, trsvchn, vfdev-5, y0ast, ydcjeff

🎉 Since september we have a new logo (1324) 🎉

Core

Metrics

- **[BC-breaking]** Made Metrics accumulate values on device specified by user (1238)
- Fixes BC if custom metric returns a dict (1478)
- Added PSNR metric (1570, 1595)

Handlers

- Checkpoint can save model with same filename (1423)
- Add `greater_or_equal` option to Checkpoint handler (1597)
- Update handlers to use setup_logger (1617)
- Added TimeLimit handler (1611)

Distributed helper module

- Distributed cpu tests on windows (1429)
- Added kwargs to idist.auto_model (1552)
- Improved horovod initializer (1559)

Others

- Dropped python 3.5 support (1500)
- Added `torch.cuda.manual_seed_all` to `ignite.utils.manual_seed` (1444)
- Fixed `to_onehot` function to be torch scriptable (1592)
- Introduced standard stream for logger setup helper (1601)

Docker images

- Removed Entrypoint from Dockerfile and images (1475)

Examples

- Added [Cifar10 QAT example](https://github.com/pytorch/ignite/tree/master/examples/contrib/cifar10_qat (#1556)

Contrib

Metrics

- Improved Canberra metric for DDP (1314)
- Improve ManhattanDistance metric for DDP (1320)
- Improve R2Score metric for DDP (1318)

Handlers

- Added new time profiler `HandlersTimeProfiler` which allows per handler time profiling (1398, 1474)
- Fixed `attach_opt_params_handler` to return `RemovableEventHandle` (1502)
- Renamed `TrainsLogger` to `ClearMLLogger` keeping BC (1557, 1560)


Documentation improvements

- 1330, 1337, 1338, 1353, 1360, 1374, 1373, 1394, 1393, 1401, 1435, 1460, 1461, 1465, 1536, 1542 ...
- Update Shpinx to v3.2.1. (1356, 1372)

Codebase is MyPy checked

- 1349, 1351, 1352, 1355, 1362, 1363, 1370, 1379, 1418, 1419, 1416, 1447, 1484

---
Acknowledgments

🎉 Thanks to our community and all our contributors for the issues, PRs and 🌟 ⭐️ 🌟 !
💯 We really appreciate your implication into the project (in alphabetical order):

1nF0rmed, Amab, BanzaiTokyo, Devanshu24, Nic-Ma, RaviTezu, SamuelMarks, abdulelahsm, afzal442, ahmedo42, dgarth, fco-dv, gruebel, harsh8398, ibotdotout, isabela-pf, jkhenning, josselineperdomo, jrieke, n2cholas, ramesht007, rzats, sdesrozis, shngt, sroy8091, theodumont, thescripted, timgates42, trsvchn, uribgp, vcarpani, vfdev-5, ydcjeff, zhxxn

Core

New Features and bug fixes

- Added SSIM metric (1217)
- Added prebuilt Docker images (1218)
- Added distributed support for `EpochMetric` and related metrics (1229)
- Added `required_output_keys` public attribute (1291)

- Pre-built [docker images](https://hub.docker.com/u/pytorchignite) for computer vision and nlp tasks
powered with Nvidia/Apex, Horovod, MS DeepSpeed (1304 1248 1218 )


Handlers and utils

- Allow passing keyword arguments to save function on `Checkpoint` (1245)

Distributed helper module

- Added support of Horovod (1195)
- Added `idist.broadcast` (1237)
- Added `sync_bn` option to `idist.auto_model` (1265)

Contrib

New Features and bug fixes

- Added `EpochOutputStore` handler (1226)
- Improved displayed tag for tqdm progress bar (1279)
- Fixed bug with `ParamGroupScheduler` with schedulers based on different optimizers (1274)


And a lot of house-keeping Pre-September Hacktoberfest contributions

- Added initial Mypy check at CI step (1296)
- Fixed typo in docs (concepts) (1295)
- Fixed link to pytorch documents (1294)
- Removed prints from tests (1292)
- Downgraded tqdm version to stabilize the CI (1293)

---
Acknowledgments

🎉 Thanks to our community and all our contributors for the issues, PRs and 🌟 ⭐️ 🌟 !
💯 We really appreciate your implication into the project (in alphabetical order):

M3L6H, Tawishi, WrRan, ZhiliangWu, benji011, fco-dv, kamahori, kenjihiraoka, kilsenp, n2cholas, nzare, sdesrozis, theodumont, vfdev-5, ydcjeff,

Core

New Features and bug fixes

- Improved docs for custom events (1179)

Handlers and utils
- Added custom filename pattern for saving checkpoints (1127)

Distributed helper module
- Improved namings in _XlaDistModel (1173)
- Minor optimization for `idist.get_*` methods (1196)
- Fixed distributed proxy sampler runtime error (1192)
- Fixes bug using `idist` with "nccl" backend and torch cuda is not available (1166)
- Fixed issue with logging XLA tensors (1207)


Contrib

New Features and bug fixes
- Fixes warning about "TrainsLogger output_handler can not log metrics value" (1170)
- Improved usage of contrib common methods with other save handlers (1171)


Examples
- Improved Pascal Voc example (1193)



---
Acknowledgments

🎉 Thanks to our community and all our contributors for the issues, PRs and 🌟 ⭐️ 🌟 !
💯 We really appreciate your implication into the project (in alphabetical order):

Joel-hanson, WrRan, jspisak, marload, ryanwongsa, sdesrozis, vfdev-5