Github user davies commented on a diff in the pull request:

    https://github.com/apache/spark/pull/9581#discussion_r48631929
  
    --- Diff: python/pyspark/ml/param/shared.py ---
    @@ -603,19 +603,19 @@ class HasSolver(Params):
         """
     
         # a placeholder to make it appear in the generated doc
    -    solver = Param(Params._dummy(), "solver", "the solver algorithm for 
optimization. If this is not set or empty, default value is 'auto'.")
    +    solver = Param(Params._dummy(), "solver", "the solver algorithm for 
optimization. If this is not set or empty, default value is 'auto'.", str)
     
         def __init__(self):
             super(HasSolver, self).__init__()
             #: param for the solver algorithm for optimization. If this is not 
set or empty, default value is 'auto'.
    -        self.solver = Param(self, "solver", "the solver algorithm for 
optimization. If this is not set or empty, default value is 'auto'.")
    +        self.solver = Param(self, "solver", "the solver algorithm for 
optimization. If this is not set or empty, default value is 'auto'.", str)
             self._setDefault(solver='auto')
     
         def setSolver(self, value):
             """
             Sets the value of :py:attr:`solver`.
             """
    -        self._paramMap[self.solver] = value
    +        self._set(**{"solver": value})
    --- End diff --
    
    Why not this one?
    ```
    self._set(solver=value)
    ```


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