This is a release candidate for oneDNN v2.7. Please provide feedback and submit defect reports via Github issues.

Performance Optimizations

Intel Architecture Processors
- Improved performance for future Intel Xeon Scalable processors (code name Sapphire Rapids).
- Introduced performance optimizations for bf16 floating point math mode on Intel Xeon Scalable processors (code name Sapphire Rapids). The bf16 math mode allows oneDNN to use bf16 arithmetic and Intel AMX instructions in computations on fp32 data.
Intel Graphics Products
- Improved performance for future Xe Architecture graphics (code name Ponte Vecchio).
- Introduced performance optimizations for tf32 floating point math mode on future Xe Architecture graphics (code name Ponte Vecchio). The tf32 math mode allows oneDNN to use tf32 arithmetic in computations on fp32 data.
- Improved performance for Intel Arc graphics (formerly Alchemist and DG2) and Intel Data Center GPU Flex Series (formerly Arctic Sound-M)
AArch64-based Processors
- Improved convolution and binary primitive performance for processors with SVE 512 support.
- Improved shuffle primitive performance for processors with SVE 256 and SVE 128 support.
- Improved PReLU, batch normalization, and pooling primitives performance via Arm Compute Library (ACL).
- Improved performance of inner product, matmul, convolution, and batch norm primitives with post-ops via ACL.
PowerPC64-based Processors
- Introduced performance optimizations for int8 and bfloat16 GEMM.

Functionality

Introduced runtime output scales support in all primitives.
Introduced scales support in concat primitive.
Extended floating point math mode API with tf32 data type option.
Extended eltwise primitive with support for hardsigmoid algorithm.
Extended layer normalization primitive with support for mixed source and destination data types.
Extended depthwise post-op with support for arbitrary padding size. The implementation is available only on Intel processors.
Added limited fp64 data type support in convolution primitive. Optimized implementation is available for future Xe Architecture graphics (code name Ponte Vecchio).
Extended int8 convolution and deconvolution implementations on GPUs with arbitrary destination data type support.
Extended batch normalization primitive with dnnl_fuse_norm_add_relu flag that allows to fuse sum and relu operations. The implementation is available for Intel GPUs.
Extended GPU deconvolution primitive implementation with support for output scales and zero points.
Introduced threadpool threading support for AArch64-based processors.
Introduced Unified Shared Memory (USM) support for SYCL backend on NVIDIA GPUs.
Introduced initial support for AMD GPUs via MIOpen library. Supported primitives include Local Response Normalization (LRN), softmax, and eltwise.

Introduced annotations for JIT kernels to allow profilers like Linux perf to correctly label JIT code.
Extended verbose logs converter with RNN primitive support.
Added verbose output for dnnl_gemm* calls.
Removed Level Zero headers from the list of build time dependencies.
Adjusted NVIDIA GPU implementation to comply with oneDNN numerical behavior. Implicit downconvert to fp16 and tf32 are now managed via math mode API.

Added benchdnn driver for validation of internal BRGEMM implementation.
Improved benchdnn reference implementation performance with threadpool threading model.
Extended benchdnn performance benchmarking capabilities on GPU with device-side performance measurement mode (mode=po).

Support for SYCL 1.2.1 (aka SYCL 2017 standard) is deprecated and will be removed in the future releases.
Static output scales are deprecated and will be removed in the next release.
Convolution Winograd algorithm implementation for int8 data type is deprecated and will be removed in the next release.

Changed formula for AUGRU RNN cell to align with Tensorflow. See proposal for details.

This release contains contributions from the project core team as well as Aidan Belton @AidanBeltonS, @akshatasangelkar, Alex Bojan @lb991, Crefeda Rodrigues @cfRod, Damian Szwichtenberg @dszwicht, Diana Bite @diaena, Divakar Mariyanna @bmdivakar, Emilio Cota @cota, Gordon Fossum @austinpagan, Hugh Delaney @hdelan, Jacek Czaja @jczaja, @jakpiase, Jonathan Deakin @jondea, Kentaro Kawakami @kawakami-k, Kotha Sowmya @Sowmyakotha1999, Louie Tsai @louie-tsai, Mark Ryan @markdryan, MITSUNARI Shigeo @herumi, Mona Minakshi @monaminakshi, @NaNAGISaSA, Nathan John Sircombe @nSircombe, Peter Caday @petercad, @pgorlani, Sreekanth Yalachigere @sreekanth-yalachigere, Tadej Ciglarič @t4c1, and Thiago Macieira @thiagomacieira. We would also like to thank everyone who asked questions and reported issues.