viterbi() {
        const len = this.len;
        let pos = 0;
        while (pos <= len) {
            if (this.beginNodes[pos].length == 0) {
                return [];
            }
            for (let rnode of this.beginNodes[pos]) {
                rnode.prev = null;
                let bestScore = 0.0;
                let bestNode = null;
                for (let lnode of this.endNodes[pos]) {
                    const score = lnode.backtraceScore + rnode.score;
                    if (bestNode === null || score > bestScore) {
                        bestNode = lnode.clone();
                        bestScore = score;
                    }
                }

                if (bestNode !== null) {
                    rnode.prev = bestNode;
                    rnode.backtraceScore = bestScore;
                } else {
                    return [];
                }
            }
            ++pos;
        }

        const results = [];
        const root = this.beginNodes[len][0];
        const prev = root.prev;
        if (prev === null) {
            return [];
        }

        let node = prev.clone();
        while (node.prev !== null) {
            results.push(node.clone());
            const n = node.clone();
            node = n.prev.clone();
        }

        results.reverse();
        return results;
    }
Implements the Viterbi algorithm to compute the most likely sequence of tokens.

@returns {TokenLatticeNode[]} The most likely sequence of tokens.