Latest monty version broken if PyTorch not installed

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The latest monty version on PyPI doesn't work if PyTorch isn't installed.

A fix was added a few hours after the latest version was released I've tested that using the version on GitHub works fine. Specifically, this line does it.

f1c7dc5#diff-5aeb6626fd2ac19ae11bf1165e56c49561b3946a9ccd7cd91aa69d250e3425d6R293

Please could you push a new version.

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Thanks!