Kernel dies in the 3-logreg-nb-imdb.ipynb notebook of "A Code-first Introduction to NLP"

Kernel dies at this step in the 3-logreg-nb-imdb.ipynb notebook, between the second “Naive Bayes” section and the second “Binarized Naive Bayes” section (running Windows 10 Home edition, 64-bit):

p0 = np.squeeze(np.array(xx[neg].sum(0)))
p1 = np.squeeze(np.array(xx[pos].sum(0)))

I created this as issue #31 at https://github.com/fastai/course-nlp/issues