Opencv3.0 LogisticRegression svm scaling

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I am trying to use cv::ml::LogisticRegression to scale the weights given by a SVM. To train the model I am passing the weight data in the range of [-inf, inf] and the labels (-1 or 1) to the function cv::ml::LogisticRegression::train()

Till now everything works fine, but when I try to predict a sample by using cv::ml::LogisticRegression::predict() I allways get the result -1 or 1. Thus exactly the same result as from the SVM. In my opinion the result should be a probability between 0 and 1.

Used parameters for cv::ml::LogisticRegression():

• learning rate: 0.001
• iterations: 1000
• train method: BATCH
• regularisation: REG_L2
• minibatch_size: 1

Am I doing anythin wrong ?