[Numpy-discussion] reseed random generator (1.19)

Neal Becker ndbecker2 at gmail.com
Sat Jul 4 14:37:49 EDT 2020

On Sat, Jul 4, 2020 at 1:56 PM Robert Kern <robert.kern at gmail.com> wrote:

> 3. Is there a way of telling the number of draws a generator did?
>> The use case is to checkpoint the number of draws and `.advance` the
>> bit generator when resuming from the checkpoint. (The runs are longer
>> then the batch queue limits).
> There are computations you can do on the internal state of PCG64 and
> Philox to get this information, but not in general, no. I do recommend
> serializing the Generator or BitGenerator (or at least the BitGenerator's
> .state property, which is a nice JSONable dict for PCG64) for checkpointing
> purposes. Among other things, there is a cached uint32 for when odd numbers
> of uint32s are drawn that you might need to handle. The state of the
> default PCG64 is much smaller than MT19937. It's less work and more
> reliable than computing that distance and storing the original seed and the
> distance.
> --
> Robert Kern

Sorry, you lost me here.  If I want to save, restore the state of a
generator, can I use pickle/unpickle?

*Those who don't understand recursion are doomed to repeat it*
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