arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.16409q-fin.CPcs.CEcs.LG
收藏

基于强化学习的衍生品深度对冲

Deep Hedging of Derivatives Using Reinforcement Learning

University of Toronto(多伦多大学)

Jay Cao, Jacky Chen, John Hull, Zissis Poulos

摘要:

本文展示了如何强化学习可以用来推导出最优套期保值策略的衍生品时,有交易成本。本文通过展示使用德尔塔对冲和最优对冲之间的差异,在一个看涨期权的空头头寸时,目标是最小化一个函数等于平均对冲成本加上一个常数乘以标准差的对冲成本的方法。考虑两种情况。在第一种情况下,资产价格遵循几何布朗运动。在第二种情况下,资产价格遵循随机波动率过程。本文以多种方式扩展了基本的强化学习方法。首先,它使用两个不同的Q函数,以便针对不同的状态/动作组合跟踪成本的期望值和成本的平方的期望值。这种方法增加了可以使用的目标函数的范围。其次,它使用了一种允许连续状态和动作空间的学习算法。第三,它比较了会计损益法(在每个步骤中对套期头寸进行估值)和现金流量法(使用现金流入和流出)。我们发现,一个混合的方法,涉及使用会计损益法,结合了一个相对简单的估值模型工作得很好。估值模型不必与为基础资产价格假设的过程相对应。

英文摘要:

This paper shows how reinforcement learning can be used to derive optimal hedging strategies for derivatives when there are transaction costs. The paper illustrates the approach by showing the difference between using delta hedging and optimal hedging for a short position in a call option when the objective is to minimize a function equal to the mean hedging cost plus a constant times the standard deviation of the hedging cost. Two situations are considered. In the first, the asset price follows a geometric Brownian motion. In the second, the asset price follows a stochastic volatility process. The paper extends the basic reinforcement learning approach in a number of ways. First, it uses two different Q-functions so that both the expected value of the cost and the expected value of the square of the cost are tracked for different state/action combinations. This approach increases the range of objective functions that can be used. Second, it uses a learning algorithm that allows for continuous state and action space. Third, it compares the accounting P&L approach (where the hedged position is valued at each step) and the cash flow approach (where cash inflows and outflows are used). We find that a hybrid approach involving the use of an accounting P&L approach that incorporates a relatively simple valuation model works well. The valuation model does not have to correspond to the process assumed for the underlying asset price.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑