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This ensures compatibility with zsh.

Fix #2316.

Use -e only in docs targeted at contributors.

If a user copy-pastes  command line with [--editable], they will hit
an error. If they don't know the --editable option, we're giving them
a choice to make before they can move forwards, but this isn't a choice
they need to make right now.

Also provide shortcuts in a Makefile.

Just say “the following” so that this intro doesn't so easily fall out of date :) )

cf https://github.com/huggingface/transformers/commit/855ff0e91d8b3bd75a3b1c1316e2efd814373764#commitcomment-36452545

ping @lysandrejik @thomwolf

Is this clear enough? Anything we should add?

* Switch to plain unittest for skipping slow tests.

Add a RUN_SLOW environment variable for running them.

* Switch to plain unittest for PyTorch dependency.

* Switch to plain unittest for TensorFlow dependency.

* Avoid leaking open files in the test suite.

This prevents spurious warnings when running tests.

* Fix unicode warning on Python 2 when running tests.

The warning was:

    UnicodeWarning: Unicode equal comparison failed to convert both arguments to Unicode - interpreting them as being unequal

* Support running PyTorch tests on a GPU.

Reverts 27e015bd.

* Tests no longer require pytest.

* Make tests pass on cuda

Co-Authored-By: Santosh-Gupta <San.Gupta.ML@gmail.com>

see also https://github.com/salesforce/ctrl/pull/50

Co-authored-by: Thomas Wolf @thomwolf