Fix threading issues in auto-threshold code #73
Merged
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Previous implementation deadlocked on Windows. This change fixes that and cleans up the code in general. Now uses ThreadPoolExecutor instead of explicitly launching Threads. Even after the general cleanups I was encountering deadlocks in np.dot on normal numpy arrays in a threaded context -- switching to the "blis" BLAS implementation fixed that (requirements.yml now contains an entry for this).