Each t-SNE class should have a isInitialized() member
Each t-SNE class should check if a preset initial embedding is set before randomly initializing (same fix as f97954da8ee9eb08e83ed56a7421c37d9ab6eea1 but now for the other classes, too)
WeightedTSNE used it's own parameter class that was identical to the TsneParameters class
isInitialized()memberWeightedTSNEused it's own parameter class that was identical to theTsneParametersclass