Hi in the docs online, the figure displayed following the code for "Plot the frequency response of the filters" seems to be showing a set of 2D filters which are not actually produced by that code.
i.e., the figure on the page looks like this:

when it should look like something like this (what you get from running the code):

Even the text captions don't match the code.
Similarly, the next figure is also erroneously for a 2D wavelet that doesn't match the code. It looks like this:

when it should look like

Perhaps there's some kind of mixup in the sphinx build process?