• 2022-07-28
    ( )不属于词向量。
    A: one-hot
    B: word2vec
    C: Bag of word
    D: jieba
  • D

    内容

    • 0

      如果曲面$S$由参数方程给出:$x=u+v,\ y=uv,\ z=u-v$,则在任意一点的单位法向量为( ) A: $\pm \frac{(-u-v)\vec{i}+2\vec{j}+(u-v)\vec{k}}{\sqrt{2{{u}^{2}}+2{{v}^{2}}+4}}$ B: $\pm\frac{(u+v)\vec{i}+2\vec{j}+(-u-v)\vec{k}}{\sqrt{2{{u}^{2}}+2{{v}^{2}}+4}}$ C: $\pm \left[ (-u-v)\vec{i}+2\vec{j}+(u+v)\vec{k} \right]$ D: $\pm \left[ (u+v)\vec{i}+2\vec{j}+(-u-v)\vec{k} \right]$

    • 1

      Read the first three sentences of the text to find out one word in two different senses.[ ] A: sun B: hot C: competition

    • 2

      已知向量\(|\vec {a}|=13,|\vec{b}|=19,|\overrightarrow{a+b}|=24 ,则向量|\overrightarrow{a-b}|=\)

    • 3

      已知`\vec\alpha _1,\vec\alpha _2,\vec\beta _1,\vec\beta _2`是4维列向量,设`\| alpha _1,alpha _2,alpha _3,beta | = a,| beta + gamma ,alpha _3,alpha _2,alpha _1| = b`,则`\| 2\gamma ,alpha _1,alpha _2,alpha _3 | = ` ( ) A: \[(a - b)\] B: \[2(a - b)\] C: \[(a + b)\] D: \[2(a + b)\]

    • 4

      "star" 与 "sun" 两个单词的one-hot词向量的夹角余弦值是多少? A: 0 B: 1 C: -1