This is typically achieved by a classical machine learning technique that we call a convolutional neural network.

这通常是用一种经典的名为卷积神经网络的机器学习技术完成的。

I used classical techniques, translated from my college days spent in the darkroom into Photoshop, to achieve the black-and-white image.

我将大学在暗室中度过的时光转化成图片处理软件的技巧，并用这经典的技巧，将其变成了黑白图像。

Metric learning is a classical technique in the field of machine learning, where we're trying to learn distances between things where distance is mathematically ill-defined.

“度量学习”是机器学习领域的一个经典技术，用来解决那些我们想去学习的不同参数状态的距离，而这些距离又没有明确数学定义的情况。