This is the release note of v7.8.0. See here for the complete list of solved issues and merged PRs.

For those who need to run Chainer on CUDA 11.1+, this release provides "limited" support for CuPy v8/v9. We confirmed that basic tests and examples run fine, but we still encourage Chainer v7 users to stay with CuPy v7.8.0 & CUDA 10.2 or earlier & cuDNN v7.6 if you don't have strong reasons to upgrade. The warning message will be shown if you run Chainer v7 with CuPy v8 or later, but you can disable it by setting the new CHAINER_WARN_VERSION_MISMATCH=0 environment variable. Please also understand that CuPy v10 is not compatible with Chainer.

As announced previously, Chainer is under the maintenance phase. There are no further planned releases for Chainer v7 series.

Enhancements

• Add CHAINER_WARN_VERSION_MISMATCH environment variable (#8588)
• Support importing cuDNN in CuPy v8 (#8590)

Bug Fixes

• Fix chainer.testing requiring pytest installed (#8611)

Code Fixes

• Import cupy.cuda.cudnn first to show preload warning (#8605)
• Fix random for CuPy v8/v9 (#8606)

Documentation

• Fix simple typo, cotiguousness -> contiguousness (#8595, thanks @timgates42!)
• Add CuPy version recommendation (#8608)

Installation

• Add detection of cupy-cuda110 (#8580)
• Add recent CuPy packages (#8609)

Examples

• Update Optuna examples (#8597)

Tests

• Update [jenkins] requirement (#8585)
• Ignore CuPy deprecation warnings in tests (#8589)
• Use Python 3.7 in ReadTheDocs (#8591)
• Use stable CuPy v7 in ONNX test (#8592)
• Avoid pytest.PytestUnknownMarkWarning (#8599)
• Remove travis for macOS (#8600)
• Fix broken skip condition (#8607)
• Fix debug print tests (#8610)

Others

• Mitigate breaking changes in CuPy v8 (#8583)
• Ignore NumPy 1.20 deprecations (#8598)