These sets of vectorish things, like arrows or lists of numbers or functions, are called vector spaces.

这些向量集合 如箭头 字列表或函 被称为向量空间。

This collection here of the averaged nudges to each weight and bias is, loosely speaking, the negative gradient of the cost function referenced in the last video, or at least something proportional to it.

宽松地说，这里对每个权重和偏差平均微调集合是上一个视频中引本函负梯度，或者至少是与比例东西。

The function that answers it is called " n choose 4" which by definition  counts the number of quadruplets from a set of size N and the way to calculate it is similar  to what we saw before.

回答这个问题函称为“n select 4”，根据定义，它计算大小为 N 集合中四联体量，计算方法与我们前看到类似。