Released Chainer v7.1.0

[ecas...@preferred.jp]

We have released Chainer v7.1.0, please find attached the release note.

This is the release note of v7.1.0. See here for the complete list of solved issues and merged PRs.

Enhancements

• Support custom initializers in NStepRNN (#8489)
• Support n_step_gru function on exporting ONNX (#8492, thanks @msakai!)
• Extend ONNX-Chainer's TransposeSequence converter to support more cases (#8493, thanks @msakai!)
• Add NStepGRU link converter example to ONNX-Chainer test (#8494, thanks @msakai!)
• Allow ONNX-Chainer's patch_functions to patch functions in modules other than chainer.functions (#8495, thanks @msakai!)
• Replaced n_fold with n_folds (#8516, thanks @Saanidhyavats!)
• Remove trailing whitespaces (#8536)

Performance Improvements

• Fast IndexIterator for ChainerX CUDA (#8360)

Bug Fixes

• Fix CooMatrix.to_dense for duplicate indices (#8187)
• Add try/finally block to yield in reporter.py (#8508)

Documentation

• Fix several documentation errors in chainer.functions.rnn.* (#8454, thanks @msakai!)
• Fix typo: chainermn.extension -> chainermn.extensions (#8526, thanks @msakai!)
• Remove '--pre' from 'pip install' commands in ChainerX installation document (#8527, thanks @msakai!)

Installation

• Do not install chainer>=7.0.0 in python2 (#8517, thanks @knorth55!)

Tests

• Add chainerx test in observation_aggregator (#8384)
• Fix flaky TestZeta (#8514)
• Fix flaky test: TestCholesky (#8520)
• Skip chainerx.fromfile test when dtype is bool_ and mode is text (#8521)
• Use FunctionTestCase to test F.decov (#8522)