[REVIEW] Fix SVC decision function data type #2586
Merged
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This PR fixes the SVC decision function data type. Without this fix, the decision function is incorrect if we have integer labels.
The predict function of SVMBase can provide either the predictions (class labels for SVC) or the decision function values. While the labels can be any numerical type, the decision function values are expected to be floats. This has to be considered when we configure the output data type.
A unit test is added to prevent similar errors in the future.
Additional unrelated changes: