I will give you an outsider's perspective on an analogy in this case. It is easy to see Candle as a ML crate to use for neural networks in rust. I have used it, and it works well.

The analogy is Tensorflow 5-10 years ago. It is popular, and there are lots of material on it. You quickly learn from talking to people that due to whims, a collection of reasons, people's love of consensus that no one is recommending it; new people are not learning it. In this case, the Torch analogy is the Burn lib.