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1

The main reason to use powers of 2 is in the way existing hardware and software are made, there isn't any purely mathematical reason. CPUs, GPUs, memories, and internal buses all use a size that's the power of 2 since that's the most efficient way to address them.


4

The choice of the batch size to be a power of 2 is not due the quality of predictions . The larger the batch_size is - the better is the estimate of the gradient, but a noise can be beneficial to escape local minima. However, there won't be much difference in optimization procedure for batch_size=61 and batch_size=64, since the amount of stochasticity would ...


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