This is the release note of v6.0.0b3. See here for the complete list of solved issues and merged PRs.

New Features

• Implement cupy.put and cupy.place (#1787, thanks @grafi-tt!)
• Add plan argument to FFT functions in cupyx.scipy.fftpack (#1942 #2033, thanks @leofang!)
• Add out argument to ndarray.get for asynchronous device-to-host copy (#1970, thanks @jeng1220)
• Add NCCL 2.4 functions (#1992)

Enhancements

• Remove experimental warning of cupy.fuse (#1379)
• Support comparing complex-number arrays in cupy.allclose (#1947, thanks @leofang!)
• Use version interface in NCCL 2.3.4 (#1985)
• Enhance error messages of elementwise operation in fusion mode (#2007)
• Fix vector handling (#2008)
• Support cuDNN FP16 batch normalization (#2034)
• Avoid import numpy (#2040)
• Avoid using pytest attributes during import (#2055)
• Support Python scalars in iscomplexobj (#1991)

Performance Improvements

• Improve performance of reduction on outer axis (#2010, thanks @grafi-tt!)
• Reduce vector copy in ndarray initialization (#2015)
• Improve kind score operation (#2017)
• Improve dictionary operation (#2018)
• Improve get_ufunc_kernel (#2019)
• Reduce get_device_id call (#2021)
• Improve performance of broadcasting in elementwise kernels (#2022)
• Improve _is_fusing performance (#2023)

Bug Fixes

• Fix cupy.random.randint fail with size zero (#1967)
• Call free_all_blocks to free CUDA memory (#1984)
• Define __dealloc__ instead of __del__ for cdef-classes to fix memory leak (#1995, thanks @msakai!)
• Fix NCCL version assignment for NCCL < 2.3.4 (#2009)
• Fix __array_function__ bug (#2024)
• Fix usage array function for CuPy modules (#2026, thanks @pentschev!)
• Fix random generator seed type (#2036)

Code Fixes

• Remove duplicate declaration of cudaMalloc (#2028, thanks @grlee77!)
• Fix incorrect dtype for ipiv buffer in cupy.linalg.inv (#2043, thanks @msakai!)

Documentation

• Add documentation of cupy.fuse (#1789)
• Fix README image to use URL (#1977)
• Add cupy-cuda100 to README (#1978)
• Document NumPy 1.16 support (#1986)
• Document new features in cupy.fft and cupyx.scipy.fftpack (#2035, thanks @leofang!)
• Fix cupyx.scipy.get_array_module's docstring (#2050, thanks @msakai!)
• Make plan argument in 2D/3D FFT functions experimental (#2056)

Installation

• Eliminate RUNPATH to use correct cuDNN (#1770)
• Fix eliminate-runpath (#2014)
• Fix RPATH not set correctly (#2064)

Examples

• Improve memcpy example (#1999, thanks @grafi-tt!)

Tests

• Fix test of assert_array_list_equal (#1997)
• Fix test with NumPy 1.16.1 (#1998)
• Do not "accept error" if bad kwarg is passed to test itself (#2001)