malloc.c:3079 assertion failure in m2.1.py

[cwpearson]

In fall 2019, some students report seeing the following error occasionally

* Running /usr/bin/time python m2.1.py
Loading fashion-mnist data...done
Loading model...done
New Inference
Op Time: <snip>
python: malloc.c:3079: __libc_malloc: Assertion `!victim || chunk_is_mmapped (mem2chunk (victim)) || ar_ptr == arena_for_chunk (mem2chunk (victim))' failed.
Command terminated by signal 6