You will be shown an excerpt from a computer science scientific research paper, followed by a question about the paper. Please answer the question. Do not include any text in your response other than the answer.

Context: This is identical to QGen, but instead of using the pure neural model, we train the hybrid model in Section 4.4 setting \lambda=1.0 for all models to avoid any domain-targeted tuning. We train the term and neural components independently, combing them only at inference.

Question: How did the authors decide lambda, and what is the optimal value?
lambda=1.0 is used to avoid any domain-targeted tuning. Authors train the term and neural components independently, combing them only at inference.