Hardwired value of Sigmoid parameter used instead of value specified in parameters

[mjmckp]

machinelearning/src/Microsoft.ML.LightGBM/LightGbmBinaryTrainer.cs

Line 133 in 5123aee

var cali = new PlattCalibrator(Host, -0.5, 0);

The hardwired value 0.5 in the line above should instead be the value of the Sigmoid parameter specified when the model was trained (the default value of which is 1, but used to be 0.5).

[mjmckp]

Same issue exists here as well:

machinelearning/src/Microsoft.ML.LightGBM/LightGbmMulticlassTrainer.cs

Line 101 in 5123aee

var cali = new PlattCalibrator(Host, -0.5, 0);