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This looks like debug code accidentally committed in b18509c2.

Refs #2250.

This looks like a copy/paste mistake. Probably this test was never run.

Refs #2250.

Since the file is written to the filesystem, a filesystem lock is the
way to go here. Add a dependency on the third-party filelock library to
get cross-platform functionality.

Caching models across test cases and across runs of the test suite makes
slow tests somewhat more bearable.

Use gettempdir() instead of /tmp in tests. This makes it easier to
change the location of the cache with semi-standard TMPDIR/TEMP/TMP
environment variables.

Fix #2222.

This allows moving the file instead of copying it, which is more
reliable. Also it avoids writing large amounts of data to /tmp,
which may not be large enough to accomodate it.

Refs #2222.

This looks like it could be expensive, so don't run it twice.

- Create the output directory (whose name is passed by the user in the "save_directory" parameter) where it will be saved encoder and decoder, if not exists.
- Empty the output directory, if it contains any files or subdirectories.
- Create the "encoder" directory inside "save_directory", if not exists.
- Create the "decoder" directory inside "save_directory", if not exists.
- Save the encoder and the decoder in the previous two directories, respectively.

convert to int earlier