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Hello! The SoftLabelCRF algorithm is useful when your sequence labeling task may require multiple ground truth labels on the same token/span.
If this is the case for your NER task, you can try using a learnable matrix as your transition matrix. (We use a model to predict each entry of this matrix, but for NER since the labels are pre-defined you can use something simpler.) You may also enforce the value of some entries by rules (e.g. O->I should have zero transition probability, or equivalently, negative infinity transition potential).
You may refer to our paper for a more intuitive understanding of the algorithm. The code is a vectorized implementation so it may be hard to read.
Hope that helps!
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