This is the release of v4.0.0b4. See here for the complete list of solved issues and merged PRs.

Important Changes

Starting from this release, CuPy supports wheel packages. The packages have different names depending on the CUDA versions. Installation is much faster with wheel packages than with the conventional installation from source.

To install CuPy from a wheel package, first uninstall the existing CuPy if you have, and then type the following command with appropriate CUDA version.

$ pip install --pre cupy-cuda80
$ # or
$ pip install --pre cupy-cuda90

Note: the wheel packages include cuDNN and NCCL2 binaries. These included binaries are automatically used by CuPy instead of those prepared by yourselves.

New Features

• Implement isclose (#825)
• Introduce cupyx namespace (#894)
  • cupy.scatter_add is marked as deprecated. Use cupyx.scatter_add instead.
• Add logic type tests: iscomplex, iscomplexobj, isfortran, isreal, isrealobj (#904)
• Import numpy complex dtypes into cupy namespace. (#907, thanks @ericmjl!)
• Simplify free_all_blocks interface (#918)
• Support CUDA stream on FFT (#926)
• Add forward/backward support for cuDNN clipped ReLU and ELU (#938, thanks @tkerola!)

Improvements

• Simplify __getitem__ and __setitem__ (#724)
• Fix concatenate bug and improve performance (#747)
• Improve cupy.partition performance (#763)
• Support memory pool for FFT functions (#910)
• Implement memory pool index compaction (#912)
• Enable complex tensors for cupy.matmul and cupy.einsum (#921, thanks @hknerdgn!)
• Move cupy.cufft to internal functions of cupy.fft.fft (#924)
• Use cublas*gemmStridedBatched APIs in matmul (#930, thanks @anaruse!)
• Use __dealloc__ in memory object (#934)
• Embed build-time version of CUDA/cuDNN (#937)
• Remove unnecessary code in cupy.fft (#951)
• Prefer data type objects over character codes (#956)
• Prefer double quoted docstring to single quoted docstring (#957)
• Simplify chained comparisons (#958 )
• Remove warning in cupy.core.fusion (#960)

Bug Fixes

• Fix concatenate bug and improve performance (#747)
• Fix scalar broadcast (#789)
• Test sparse with many types of sparse matrices (#833)
• Fix array iteration index overflow (#882)
• Fix get and set method with async mode (#900)
• Fix bug about stream deletion (#917)
• Fix test failure in cuDNN v5 which does not support CUDNN_ACTIVATION_ELU (#959)

Installation

• Improve message during installation (#762)
• Support wheel build (#899)
• Exclude Cython files from sdist (#920)
• Add --cupy-long-description option to inject long description for wheels (#953)

Documentation

• Improve the document of rand/randn with examples (#908)
• Fix typo: nestead -> nested (#943, thanks @rcalland!)
• Use https in supported websites (#948)

Tests

• Test sparse with many types of sparse matrices (#833)
• Fix test failure in cuDNN v5 which does not support CUDNN_ACTIVATION_ELU (#959)