The current 'evaluate' keyword seems to confuse some people. 
I think following behavior is more logical and it would be
easy to implement. 

----------------------------------------------------------
evaluate P0 [, P1 [, P2]]
  P0: case (0)     : no warnings
      case (non 0) : same as the current version
      default value:1

  P1: case (0)    : no dynamic max_gradient estimation
                           (i.e. fixed max_gradient)
      case (non 0): same as the current version 
      default value:0

  P2: same as the current version
      default value:1
----------------------------------------------------------

Then, we can use "evaluate on", "evaluate off".

R. Suzuki

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