fairseq_sagemaker_translate_de2en.ipynb failed CI

Link to the notebook:
https://github.com/aws/amazon-sagemaker-examples/blob/master/advanced_functionality/fairseq_translation/fairseq_sagemaker_translate_de2en.ipynb

Error:

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Exception encountered at "In [2]":
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CalledProcessError Traceback (most recent call last)
in
----> 1 get_ipython().run_cell_magic('sh', '', '\n# First we download fairseq in order to have access to the scripts\ngit clone https://github.com/pytorch/fairseq.git fairseq-git\ncd fairseq-git\n\n# Binarize the dataset:\nTEXT=../data/iwslt14.token

[...]

CalledProcessError: Command 'b'\n# First we download fairseq in order to have access to the scripts\ngit clone https://github.com/pytorch/fairseq.git fairseq-git\ncd fairseq-git\n\n# Binarize the dataset:\nTEXT=../data/iwslt14.tokenized.de-en\npython preprocess.py --source-lang de --target-lang en \\\n --trainpref $TEXT/train --validpref $TEXT/valid --testpref $TEXT/test \\\n --destdir ..data/iwslt14.tokenized.de-en\n'' returned non-zero exit status 2.

Start with advanced_functionality/fairseq_translation/fairseq_sagemaker_translate_de2en.ipynb and inspect the failing In [2] shell cell, especially the reported fairseq preprocessing command. Reproduce the CI failure and identify why that command exits with status 2; done means the notebook completes successfully in CI.

Written by the indexing model from the issue text.