problems with class weight dict

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i am training on dataset which has three classes :class, sum of labels0, 31321, 492-1, 12as you can see there is huge unbalance here so wanted to fix it using class weights (maybe there is better way). So i created dict:{-1: 85.27777777777777,0: 0.3919315715562364,1: 2.2893363161819535}