Add a yolo-v3 example. (#528)

* Add a couple functions required for yolo.

* Add the yolo-v3 example.

* Add minimum and maximum.

* Use the newly introduced maximum.

* Cuda support for min/max + add some testing.

* Allow for more tests to work with accelerate.

* Fix a typo.

candle-examples/examples/mnist-training/main.rs

@@ -2,6 +2,9 @@
 #[cfg(feature = "mkl")]
 extern crate intel_mkl_src;
 
+#[cfg(feature = "accelerate")]
+extern crate accelerate_src;
+
 use clap::{Parser, ValueEnum};
 
 use candle::{DType, Result, Tensor, D};