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I rewrote the at() method using C language with this pull request.
Please confirm.
This is a pull request with the same content as ruby-numo/numo-narray#138.
The result is up to x21.8 times faster.
cumo benchmark
cumo benchmark code
red-chainer benchmark
1 epoch
20 epoch
cumo 0.4.3 & red-chainer
cumo 0.4.3 & red-chainer patch (replace from to_a to at() method.)
cumo 0.5.0 & red-chainer patch (replace from to_a to at() method.)
Red-chainer Patch : replace from to_a to at() method.