Error encountered with plot_function()

Continuing the discussion from Lesson 4 official topic:

Please could somebody tell me why this doesn’t work and how to correct it

Many thanks in advance

All the best


Hi Julian,

Could you please be a bit more specific. I replicated the notebook and ran it without errors.



Hi Sahil

Many thanks for taking a look at this - much appreciated

It’s odd. In the version I shared there should be a cell

plot_function(f, ‘x’, ‘x**2’)


def f(x): return x**2

for some unknown reason it doesn’t seem to be showing up but it throws an error

NameError: name ‘plot_function’ is not defined

I’m using kaggle

All the best


That’s strange!? The notebook is still the same from my end. If you are still having this issue could you try sharing the link to an updated notebook?

1 Like

Hi Sunil

Sorry about that. I think it was because I was including “commit” in the save instruction rather than just doing a quick save

Please could you try it now?

Many thanks, once again, for your help

All the best


Ah, so I think that the function is not in any of the fastai modules anymore so you have to define it yourself. This should work.

def plot_function(f, title=None, min=-2.1, max=2.1, color='r', ylim=None):
    x = torch.linspace(min,max, 100)[:,None]
    if ylim: plt.ylim(ylim)
    plt.plot(x, f(x), color)
    if title is not None: plt.title(title)

To plot the function you can use: plot_function(f)

Hi Sahil

Many thanks for taking the trouble to help me with this. It is much appreciated

All the best


Hello Sahil. Thanks for this bug fix