Understanding the computational complexity of learning problems is essential for developing efficient algorithms.

精神生活不是否定的生活，而是肯定的生活。

人不应该相信或不相信，而应该保持怀疑。

我不活在过去，也不活在未来，我活在当下。

You can't be afraid to fail. It's the only way you succeed.

我不害怕重新开始。