code: def threefry_key(seed):
      """Create a new Threefry random number generator key.
  
      Example
      -------
  
      .. code-block:: python
  
          gen = threefry_key(0)
          _, random_number = threefry_generate(gen, (4,))
  
      Parameters
      ----------
      seed : int
          Starting seed for the key
  
      Returns
      -------
      key : relay.Expr
          New key to pass to future uses of :py:func:`threefry_split` or
          :py:func:`threefry_generate`.
      """
      s = np.frombuffer(
          seed.to_bytes(32, sys.byteorder), dtype="uint64"
      )
      a = np.concatenate(
          (s, np.array([0, 0, 0, 0, 1 << 63, 0], dtype="uint64"))
      )
      return Constant(nd.array(a))
  
file_path: tvm/python/tvm/relay/op/random/kernel.py
imports: from __future__ import absolute_import
  import sys
  import numpy
  from ...expr import Constant, Expr, const
  from ....None import nd
  from .None import _make
label_desc: Use image node_id 1 for calling a global function with example usage: threefry_key(seed) and returns: Constant