Blurb::
Filename for a YAML file that specifies Gaussian process options

Description::
The YAML file contains configuration options
that are used to populate a Teuchos ParameterList used by the Gaussian process
that will override other keyword-specified parameters.
Missing options in the YAML file are set to default values.

Examples::

\verbatim
# FILE: gp_options.yaml

GP Parameters:
  Sigma Bounds: 
    lower bound: 1.0e-2
    upper bound: 1.0e2
  scaler name: standardization
  num restarts: 20
  Nugget: 
    fixed nugget: 0.0
    estimate nugget: true
    Bounds: 
      lower bound: 3.17e-8
      upper bound: 1.0e-2
  gp seed: 42
  standardize response: false
  Trend: 
    estimate trend: true
    Options: 
      max degree: 2
      reduced basis: false
      p-norm: 1.0
      scaler type: none
      regression solver type: SVD
      verbosity: 1
  kernel type: squared exponential
  Length-scale Bounds: 
    lower bound: 1.0e-2
    upper bound: 1.0e2
  verbosity: 1
\endverbatim

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