Ax 1.2.0

New features

• DerivedParameterConfig allows users to specify parameters which are not tuned,
  instead taking the value of some expression of other tunable parameters (#4454)
• New argument simplify_parameter_changes in client.configure_generation_strategy
  (defaulted to False) which when True informs Ax to change as few parameters as
  possible relative to the status quo without degrading optimization performance. Has
  a near-zero effect on generation time (#4409)
• Default to qLogNParEgo acquisition function for multi-objective optimization in
  multi-objective optimization when the number of objectives is > 4, leading to
  improved walltime performance (#4347)

Bug fixes

• Fix issue during candidate generation involving MapMetrics providing progressions
  at different scales i.e. one progression goes up to 10^9 and the other goes up to
  10^6 by normalizing to [0, 1] (#4458)

Other changes

• Improve visual clarity in ArmEffectsPlot by removing certain elements including
  red "infeasibility" halos and optional cumulative best line (#4397, #4398)
• Instructions on citing Ax included in README.md and ax.dev (#4317, #4357)
• New "Using external methods for candidate generation in Ax" tutorial on website (#4298)