Fix unhashable JIT argument

[blakeelias]

No description provided.

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[pengxk]

There is still some unhashable problem when running LFADS tutorial, which happens in these codes:
key = random.PRNGKey(onp.random.randint(0, utils.MAX_SEED_INT))
trained_params, opt_details =
optimize_lfads(key, init_params, lfads_hps, lfads_opt_hps,
train_data, eval_data)