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NVIDIA CUTLASS Changelog

3.1.0 (2023-04-14)

  • New CUTLASS Python interface that aims to provide an ease-of-use interface for instantiating, emitting, compiling, and running CUTLASS kernels via Python. More details here and new examples.
  • New efficient epilogues using TMA for Hopper.
  • Support for fused epilogues, such Bias, ReLU and GELU, using the new efficient epilogues.
  • New warp-specialized TensorFloat-32 (TF32) GEMM kernels targeting Hopper TMA.
  • New warp-specialized persistent cooperative kernel design that allows for larger tile sizes and improves performance on Hopper.
  • An example showcasing GEMM-Like Tensor-Tensor Contraction (GETT) capability on Hopper.
  • Epilogue builders. Similar to mainloop builders (see example 49), epilogue builders aim to generate the best-possible epilogue while exposing incremental opt-ins for greater customization.
  • Profiler support for overriding kernel and epilogue builder auto schedules for 3.x API kernels, allowing specific policies to be run in the CUTLASS profiler.
  • Performance optimizations for the warp-specialized persistent ping-pong kernel.
  • Changes to the GEMM API 3.x, involving the host-facing arguments and the underlying Params structs.
  • FMHA Backward Pass from Meta xFormers.
  • Streamk GEMM with Broadcast enables epilogue broadcast with StreamK GEMM.
  • Batched B2B GEMM now can run multiple Back-to-Back GEMM with the same problem size in parallel.
  • Batched Strided GEMV support both row major and column major input matrix.
  • Permute + GEMM fusion can fuse Permute with following GEMM now. Before, we only support fusing GEMM with Permute in the epilogue.
  • Row Broadcast can be fused in the epilogue.
  • The GitHub branch is renamed from master to main in this release.
  • Optimal performance using CUDA 12.1
  • Updates and bugfixes from the community (thanks!)

3.0.0 (2023-01-23)

2.11.0 (2022-11-19)

  • Stream-K, which is a new general way to do split-K. It can not only improve performance, but can also significantly reduce the number of tile sizes that need to be profiled to find the best one.

  • Fused multi-head attention Kernel. It has two variants: one uses batched GEMM for the fixed sequence length, and the other one uses group GEMM for the variable sequence length. Both versions just need one kernel.

  • Dual GEMM, which can fuse A x B and A x C into one kernel. Two GEMMs has no producer-consumer dependency.

  • Hopper improves double precision matrix multiplication by 2x compared to Ampere at iso-clocks. It is supported since CUDA 11.8.

  • BLAS3 functions with Hoppers new double precision matrix multiplication instructions.

  • ELL Block Sparse GEMM, which uses an ELL matrix to describe the sparsity of A matrix. B and output matrices are still dense. The block size can be arbitary.

  • Optimized Group Conv for SingleGroup mode, which requires that the output channel per group is a multiple of Threadblock tile N.

  • Optimized DepthWise Conv. Two new modes are added

    • kOptimized - use direct conv to compute instead of implicit GEMM.
      • The restrictions are: 1) input ,output channel and group number should be multiple of (128 / sizeof(input element)). 2) The input filter size should be the same as the template parameter configuration.
    • kFixedStrideDilation - which puts stride and dilation into templates to further improve the performance. In this mode, kernel persistents some inputs into register to squeeze more performance, so large filter/stride/dilation is not recommanded.
      • The restrictions are: 1) input, output channel and group number should be multiple of (128 / sizeof(input element)). 2) input filter size, stride, dilation should same as the template parameter configuration.

  • Scripts to fuse multiple back-to-back GEMM. Its implementation was discussed in a GTC'22 Spring talk.

  • FP8 data type definition and conversion routines.

  • Updates and bugfixes from the community (thanks!). Big shout out to Meta's xFormers.

  • Deprecation announcement: CUTLASS plans to deprecate the following:

    • Maxwell and Pascal GPU architectures
    • Ubuntu 16.04
    • CUDA 10.2

2.10.0 (2022-08-23)

  • CUTLASS Python now supports GEMM, CONV, Group GEMM for different data types as well as different epilogue flavours.
  • Optimizations for CUTLASS's Grouped GEMM kernel. Threadblock scheduling part is improved. Some computation can be moved to the host side if applicable. Grouped Syr2k kernels are added, too.
  • Optimizations for GEMM+Softmax. All the reduction computation is fused into the previous GEMM. More template arguments are provided to fine tune the performance.
  • Grouped GEMM for Multihead Attention. This general group gemm based MHA does not require the sequence length of all GEMMs to be the same which makes it most useful for natural language processing.
  • GEMM + Layer norm fusion for Ampere splits the layernorm into two parts and both of them can be fused into the GEMMs before and after separately. In addition to use square sum to compute variance of layernorm, Shift-K is provided if square sum raise numerical issues.
  • GEMM Epilogue Permutation Fusion can apply user provided permutation layout mapping in the GEMM epilogue.
  • Grouped convolution targeting implicit GEMM introduces the first group convolution implementation to CUTLASS. It is an Analytical implementation, not an Optimized. The restrictions are: 1) input and output channel number should be multiple of group number. 2) split-K is not supported. The implementation has 2 modes:
    • kSingleGroup: output channel per group is multiple of Threadblock tile N.
    • kMultipleGroup: Threadblock tile N is multiple of output channel per group.
  • Depthwise separable convolution introduces the first depthwise convolution which is also Analytical for now. The restrictions are: 1) SIMT only 2) No split-K 3) input channel equals to output channel equals to group number.
  • Standalone Layernorm and Pooling kernels.
  • Back-to-back GEMM/CONV relaxes the requirement that the first GEMM K dimension needs to be the multiple of Threadblock Tile K dimension.
  • Optimal performance using CUDA 11.6u2
  • Updates and bugfixes from the community (thanks!)

2.9.0 (2022-04-21)

  • First layer Convolution kernels specialized for small channel counts and reduced alignment
  • BLAS3 operators accelerated by Tensor Cores
  • CUTLASS Python demonstrating JIT compilation of CUTLASS kernels and a Python-based runtime using CUDA Python
  • GEMM + Softmax example
  • Gather and Scatter Fusion with GEMM can gather inputs and scatters outputs based on indices vectors in the same GEMM kernel.
    • It can select random rows in a row major matrix.
    • It can select random columns in a column major matrix.
  • Back-to-back GEMM/CONV fully supports buffering the first GEMM/CONV results in the shared memory for the latter one to use. It can eliminate register spill when the tile size is big. Additionally, bias vector add is supported in the first GEMM/CONV.
    • Supported kernels: GEMM and CONV.
    • Supported types: fp16 and int8.
    • Supported architectures: Turing and Ampere.
  • Transposed Convolution (a.k.a Deconvolution) support which reuses Dgrad implementation.
  • Utility functions that can pad NHWC and convert between NCHW and NHWC.
  • Small alignment implicit gemm support for Fprop/Dgrad/Wgrad so that padding is no longer mandated to use tensor cores in these kernels.
  • Epilogue enhancement:
    • Eliminate bank conflicts in int8 tensor core kernels.
    • Half2 usage if epilogue compute type is fp16.
    • More activation functions: Silu, Hardswish, Leaky Relu.
    • New elementwise fusion pattern for residual block.
  • Group GEMM thread block number calculation fix which helps to launch the intended number of threadblocks to fully occupy the GPUs.
  • Parallel GEMM splitk support in the CUTLASS profiler.
  • Optimal performance using CUDA 11.6u2
  • Updates and bugfixes from the community (thanks!)

2.8.0 (2021-11-19)

2.7.0 (2021-09-24)

2.6.1 (2021-09-03)

  • Arbitrary padding and striding for CUTLASS Strided DGRAD Convolution operator (Analytic Iterators)
  • Tuning for GEMMs fused with partial reductions
  • Corrections and bug fixes reported by the CUTLASS community
    • Thank you for filing these issues!

2.6.0 (2021-07-22)

  • Optimal performance when compiled with the CUDA 11.4 Toolkit
  • Fused operators with GEMM and Convolution
  • 64b tensor strides and leading dimensions support for GEMMs
  • Affine rank=2 matrix layouts
  • Batched GEMV preview implementation
  • New strided Dgrad implementation
    • Accelerates over previous implementation by cutting down redundant math by 4x
    • Support using new Dy and w analytic iterators and existing cutlass::conv::device::ImplicitGemmConvolution interface
  • Quaternion-valued GEMM and Convolution in single- and double-precision (targeting CUDA Cores)
  • Many improvements to the epilogue.
    • Provide an option to not fully unroll the epilogue to reduce the code size and improve the performance when using complicated elementwise operations
    • Performance improvement for FP16 tensor core kernels
    • Bug fixes
  • Enhanced Clang support and the combination of Clang 13 and CUDA 11.4 can build and run kernels from Pascal and Ampere.
  • Updated minimum CUDA Toolkit requirement to 10.2
  • Corrections and bug fixes reported by the CUTLASS community
    • Thank you for filing these issues!

2.5.0 (2021-02-26)

  • Tensor reductions
    • m-to-n reductions of tensors with affine layout
    • Specializations for reductions including contiguous dimension
    • Specializations for reductions excluding contiguous dimension
    • Custom reduction functors such as cutlass::logical_and
    • Large tensor support, up to 2^63 elements (however, each dimension is limited to an extent of 2^31)
  • Optimizations for 3-D convolution
  • Fused Convolution+Convolution example
  • Corrections and bug fixes reported by the CUTLASS community
    • Thank you for filing these issues!

2.4.0 (2020-11-19)

  • Implicit GEMM convolution kernels supporting CUDA and Tensor Cores on NVIDIA GPUs
    • Operators: forward (Fprop), backward data gradient (Dgrad), and backward weight gradient (Wgrad) convolution
    • Data type: FP32, complex, Tensor Float 32 (TF32), BFloat16 (BF16), Float16, Int4, Int8, Int32
    • Spatial dimensions: 1-D, 2-D, and 3-D
    • Layout: NHWC, NCxHWx
  • Implicit GEMM convolution components:
    • Global memory iterators supporting Fprop, Dgrad, and Wgrad
    • MmaMultistage for implicit GEMM convolution for NVIDIA Ampere architecture
    • MmaPipeline for implicit GEMM convolution for NVIDIA Volta and Turing architectures
    • Documentation describing Implicit GEMM Convolution algorithm and implementation

2.3.0 (2020-09-23)

2.2.0 (2020-06-08)

  • NVIDIA Ampere Architecture features
    • Fast Tensor Core operations:
    • Maximum performance via mma.sync
    • Tensor Float 32, BFloat16, and double-precision data types
    • Mixed integer data types (int8, int4, bin1)
    • Asynchronous copy for deep software pipelines via cp.async
    • Described in GTC 2020 Webinar (SR 21745) (free registration required)
  • Features:
    • SDK examples showing GEMM fused with bias+relu and fused GEMM+GEMM
    • Complex-valued GEMMs targeting NVIDIA Ampere Tensor Cores in double-precision and Tensor Float 32
    • Gaussian complex GEMMs using 3m complex multiply algorithm
    • Universal GEMM kernel supporting two batch modes and two algorithms for parallel reductions
  • Policy updates:
    • CUDA 11 Toolkit needed to enable NVIDIA Ampere Architecture features
    • Disabled F16C by default for compatibility - enable on cmake command line with -DCUTLASS_ENABLE_F16C=ON

2.1.0 (2020-04-06)

  • BLAS-style host-side API added to CUTLASS Library
    • API to launch compiled kernel instances for GEMM and planar complex GEMM
  • Planar Complex GEMM kernels targeting Volta and Turing Tensor Cores
  • Minor enhancements and bug fixes

2.0.0 (2019-11-19)

  • Substantially refactored for
    • Better performance, particularly for native Turing Tensor Cores
    • Robust and durable templates spanning the design space
    • Encapsulated functionality embodying modern C++11 programming techniques
    • Optimized containers and data types for efficient, generic, portable device code
  • Updates to:
  • Native Turing Tensor Cores
    • Efficient GEMM kernels targeting Turing Tensor Cores
    • Mixed-precision floating point, 8-bit integer, 4-bit integer, and binarized operands
  • Coverage of existing CUTLASS functionality
    • GEMM kernels targeting CUDA and Tensor Cores in NVIDIA GPUs
    • Volta Tensor Cores through native mma.sync and through WMMA API
    • Optimizations such as parallel reductions, threadblock rasterization, and intra-threadblock reductions
    • Batched GEMM operations
    • Complex-valued GEMMs
  • Note: a host compiler supporting C++11 or greater is required.

CUTLASS 1.x

1.3.2 (2019-07-09)

  • Performance improvement for Volta Tensor Cores TN and TT layouts.

1.3.1 (2019-04-09)

  • Corrected NVRTC unit tests.

1.3.0 (2019-03-20)

  • Efficient GEMM kernel targeting Volta Tensor Cores via mma.sync instruction added in CUDA 10.1.

1.2.0 (2018-10-26)

  • Parallelized reductions across threadblocks ("Split-K")
    • Improved IGEMM performance
  • Batched strided WMMA GEMMs

1.1.0 (2018-09-19)

  • Turing Features
    • WMMA GEMM targeting TensorCores - INT8, INT4, 1-bit
  • Batched Strided GEMM
  • Threadblock rasterization strategies
    • Improved performance for adverse problem sizes and data layouts
  • Extended CUTLASS Core comonents
    • Tensor views support arbitrary matrix and tensor layouts
    • Zip iterators for structuring multiple data streams
  • Enhanced CUTLASS utilities
    • Reference code for tensor operations in host and device code
    • Added HostMatrix<> for simplified matrix creation
  • Examples
    • Basic GEMM, tensor views, CUTLASS utilities, batched GEMM, WMMA GEMM

1.0.1 (2018-06-11)

  • Intra-threadblock reduction added for small threadblock tile sizes
    • sgemm_64x128x16, sgemm_128x128x16, sgemm_128x64x16, sgemm_128x32x16, sgemm_64x64x16, sgemm_64x32x16
    • igemm_32x32x128
  • GEMM K residue handled during prologue prior to mainloop
  • Replaced Google Test copy with submodule. Use git submodule init --recursive --update

1.0.0 (2018-05-16)

  • Substantial rewrite to accommodate new architecture
  • Kernels: SGEMM, DGEMM, IGEMM, HGEMM, WMMA GEMM
  • Unit and performance tests

0.0.1 (2017-12-04)

  • Initial release

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