[BUG] NameError: name 'DATA_URL' is not defined

[calpa]

When I follow the example in Chapter 2.4 Calculus, the first block can not be executed.

%matplotlib inline

import d2l
from IPython import display
from mxnet import np, npx
npx.set_np()

def f(x):
    return 3 * x ** 2 - 4 * x

Which prompts the following error:

/usr/local/lib/python3.6/dist-packages/d2l/d2l.py in <module>()
    359 # Defined in file: ./chapter_multilayer-perceptrons/kaggle-house-price.md
    360 DATA_HUB['kaggle_house_train'] = (
--> 361     DATA_URL+'kaggle_house_pred_train.csv',
    362     '585e9cc93e70b39160e7921475f9bcd7d31219ce')
    363 

NameError: name 'DATA_URL' is not defined

https://github.com/d2l-ai/d2l-en/blob/master/d2l/d2l.py#L361

The DATA_URL is defined in chapter_multilayer-perceptrons/kaggle-house-price.md, but not in the d2l.py.

[astonzhang]

Thanks. We are adding those back
bca6cfb

[ezzatmostafa96]

So what's the answer to such a problem?

[calpa]

@ezzatmostafa96 downgrade d2l to 0.11.0, i.e. pip install d2l==0.11.0 or wait the new patch.

[astonzhang]

To always get the most updated d2l lib (sometimes we may not promptly upload the patch to pypi), simply

git clone https://github.com/d2l-ai/d2l-en.git
cd d2l-en
python setup.py develop

Below lists the uploaded versions of d2l on pypi that you can pip install:
https://pypi.org/project/d2l/#history

For now, you may get the most updated version by

pip install d2l --upgrade

[astonzhang]

@ezzatmostafa96 see my comment above. thanks