为给定的英文文本生成摘要，使得摘要包含文本的核心意思，但长度不超过原文本的30%。


英文文本：Machine learning is the study of computer algorithms that improve automatically through experience. It is seen as a subset of artificial intelligence. Machine learning algorithms build a mathematical model based on sample data, known as "training data", in order to make predictions or decisions without being explicitly programmed to perform the task.
Machine learning is a subset of artificial intelligence that focuses on computer algorithms that improve through experience. These algorithms build a mathematical model using training data to make predictions or decisions without explicit programming.