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s/Three-fry/Threefry/ (#3918)

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Per http://www.thesalmons.org/john/random123/
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docs/notebooks/Common_Gotchas_in_JAX.ipynb
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@ -805,7 +805,7 @@
},
"source": [
"\n",
"JAX instead implements an _explicit_ PRNG where entropy production and consumption are handled by explicitly passing and iterating PRNG state. JAX uses a modern [Three-fry counter-based PRNG](https://github.com/google/jax/blob/master/design_notes/prng.md) that's __splittable__. That is, its design allows us to __fork__ the PRNG state into new PRNGs for use with parallel stochastic generation.\n",
"JAX instead implements an _explicit_ PRNG where entropy production and consumption are handled by explicitly passing and iterating PRNG state. JAX uses a modern [Threefry counter-based PRNG](https://github.com/google/jax/blob/master/design_notes/prng.md) that's __splittable__. That is, its design allows us to __fork__ the PRNG state into new PRNGs for use with parallel stochastic generation.\n",
"\n",
"The random state is described by two unsigned-int32s that we call a __key__:"
]
@ -2804,4 +2804,4 @@
},
"nbformat": 4,
"nbformat_minor": 1
}
}