Tuple error (numpy)
<p>I padded my data using <code>np.pad(x,[(0,0)], mode='constant')</code> and got this error:</p>

<pre><code>ValueError: Unable to create correctly shaped tuple from [(0, 0).
</code></pre>

<p>My <code>x</code> has  shape (21, 4) and I want to pad it to get a shape of (22,4).</p>

<p>Does anyone know what is happening?</p>