This method is intended for use cases after when the statistics of a matrix are calcuated and then used to transform that matrix, but where new vector data could be transformed by the same procedure. For example, a {@link TfIdfTransform} could be applied to a term document space tocreate the transform state necessary for calculating the {@code idf}; then, the same weighting could be applied to a new document. @throws IllegalStateException if this {@code Transform} instances doesnot yet have sufficient state to transform a new document. That is, the {@code transform} method has yet to be called.
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