擅长:python、mysql、java
<p>那<a href="http://docs.scipy.org/doc/numpy/reference/generated/numpy.expand_dims.html" rel="nofollow">expand_dims</a>呢?</p>
<pre><code>np.expand_dims(np.array([1,2,3,4]), 0)
</code></pre>
<p>具有形状<code>(1,4)</code>,而</p>
<pre><code>np.expand_dims(np.array([1,2,3,4]), 1)
</code></pre>
<p>具有形状<code>(4,1)</code>。</p>