Alibaba Group Holding Ltd. is rolling out its second major price cut for cloud services in years, aiming to win back users from rivals like Tencent Holdings Ltd. competing to provide the tools critical to training artificial intelligence.The Chinese internet pioneer will slash prices starting Thursday on scores of internet-based services by as much as 55%, and by 20% on average. The discounts span more than 100 products, including data storage and elastic computing options for online processing ...