擅长:python、mysql、java
<p>您可以用多种方式向向量添加新轴:例如使用<a href="https://docs.scipy.org/doc/numpy-1.15.1/reference/generated/numpy.reshape.html" rel="nofollow noreferrer">^{<cd1>}</a></p>
<pre><code>x = np.zeros(784)
x0 = x.reshape(784, 1) # shape: (784, 1)
</code></pre>
<p>或在切片时使用<a href="https://docs.scipy.org/doc/numpy-1.13.0/reference/arrays.indexing.html#numpy.newaxis" rel="nofollow noreferrer">^{<cd2>}</a>:</p>
^{pr2}$