3分钟
Torch是什么？
Torch英译中：火炬
A Tensor library like Numpy, unlike Numpy it has strong GPU support. Lua is a wrapper for Torch (Yes! you need to have a good understanding of Lua), and for that you will need LuaRocks package manager.Torch是一个与Numpy类似的张量（Tensor）操作库，与Numpy不同的是Torch对GPU支持的很好，Lua是Torch的上层包装。
Torch is not going anywhere. PyTorch and Torch use the same C libraries that contain all the performance: TH, THC, THNN, THCUNN and they will continue to be shared.
We still and will have continued engineering on Torch itself, and we have no immediate plan to remove that.PyTorch和Torch使用包含所有相同性能的C库：TH, THC, THNN, THCUNN，并且它们将继续共享这些库。
这样的回答就很明确了，其实PyTorch和Torch都使用的是相同的底层，只是使用了不同的上层包装语言。
注：LUA虽然快，但是太小众了，所以才会有PyTorch的出现。
学员评价