message: Documentation for Cholesky configiuration options
  Summary: FIX T35272
  Reviewers: #tensorflow, simonl, #framework_ip_review_-_any_oss_or_third-party_code_use_has_been_approved, georgep, vladimirm, jamiep
  Maniphest Tasks: T35272
diff: @@ -500,9 +500,23 @@ def set_optimization_options(opts,
  gather_simplifier: Will enable more aggressive optimisations for embedding
  lookups.
  triangular_solve_expander_block_size: Defines size for triangular solver
  - expander blocks. 0 - implementation defined default.
  - cholesky_block_size: Defines size for cholesky factoriser.
  - 0 - implementation defined default.
  + expander blocks. The processing within each block is performed on a
  + single tile. The control code for performing computations over blocks
  + are unrolled on the device. For a matrix of rank ``N`` and block size
  + ``B``, there are ``log2(N/B)`` iterations of the control code. The choice
  + of this parameter therefore has to balance between the amount of data in
  + a tile (lower value is better, gives better parallelism) and the amount
  + of control code (larger value is better, less control code). A value of 0
  + selects an implementation defined default.
  + cholesky_block_size: Defines the block size for the Cholesky factoriser.
  + The processing within each block is performed on a single tile. The
  + control code for performing computations over blocks are unrolled on the
  + device. For a matrix of rank ``N`` and block size ``B``, there are
  + ``N/B`` iterations of the control code. The choice of this parameter
  + therefore has to balance between the amount of data in a tile (lower
  + value is better, gives better parallelism) and the amount of control code
  + (larger value is better, less control code). A value of 0 selects an
  + implementation defined default.
  enable_fast_math: Enables optimizations which allow arbitrary reassociations
  and transformations of mathemtical operations with no accuracy guarantees.
  Enabling this option can result in incorrect output for programs that
  