message: Add a note detailing semantics of RNG_ALG_PHILOX.
diff: @@ -193,10 +193,12 @@ class Generator(tracking.AutoTrackable):
  copy_from: a generator to be copied from.
  state: a vector of dtype STATE_TYPE representing the initial state of the
  RNG, whose length and semantics are algorithm-specific.
  - alg: the RNG algorithm. Possible values are RNG_ALG_PHILOX for the
  - Philox algorithm and RNG_ALG_THREEFRY for the ThreeFry
  + alg: the RNG algorithm. Possible values are `RNG_ALG_PHILOX` for the
  + Philox algorithm and `RNG_ALG_THREEFRY` for the ThreeFry
  algorithm (see paper 'Parallel Random Numbers: As Easy as 1, 2, 3'
  [https://www.thesalmons.org/john/random123/papers/random123sc11.pdf]).
  + Note `RNG_ALG_PHILOX` guarantees the same numbers are produced (given
  + the same random state) across all architextures (CPU, GPU, XLA etc).
  """
  if copy_from is not None:
  # All other arguments should be None
  