fix simple data source shuffle problem

sony / nnabla

Neural Network Libraries

https://nnabla.org/

Apache License 2.0

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fix simple data source shuffle problem #1187

Closed TomonobuTsujikawa closed 1 year ago

TomonobuTsujikawa commented 1 year ago

The PR: https://github.com/sony/nnabla/pull/1160 introduced a bug that SimpleDataSource must have different order after 16 epochs. So, this PR fixes the problem in simple data source shuffle, and adds test code for this feature.