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Do you mean v0.2.0 or v0.2.2? From a cursory look at the repo, it looks like alloc_threaded_grad was added in 0.2.1, so the UndefVarError makes sense if you were using the older 0.2.0 version.

We probably should have released the blog post version as 0.3 instead of 0.2.1.

There were not any breaking changes, but enough fixes and additions (e.g., the convolutional layer and threading) that 0.2.0 isn't really comparable.

Odds are there is a version conflict in 0.2.1 (which also bumped dependency requirements) that does not exist in 0.2.0, and that this is preventing you from upgrading. You could start a smaller environment, or try `] add SimpleChains@0.2.1` to force it/get an error message telling you what the conflict is.

Just to confirm, v0.2.1 is the fast version.

Hmm... looks like he never came back to properly benchmark it with the right version, never did a version with the multithreaded call, and has a 1x number that is suspiciously different from everyone else who ran the benchmark in the Gist. Peculiar.