You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: lib.rs
    path of file: ./repos/juice/coaster/src
    
    the code of the file until where you have to start completion: //! Provides a simple and unified API to run fast and highly parallel computations on different
//! devices such 
    
//! fn main() {
//!     // Initialize a CUDA Backend.
//!     let backend = Backend::<Cuda>::default().unwrap();
//!     // Initialize two SharedTensors.
//!     let mut x = SharedTensor::<f32>::new(&(1, 1, 3)).unwrap();
//!     let mut result = SharedTensor::<f32>::new(&(1, 1, 3)).unwrap();
//!     // Fill `x` with some data.
//!     let payload: &[f32] = &::std::iter::repeat(1f32).take(x.capacity()).collect::<Vec<f32>>();
//!     let native = Backend::<Native>::default().unwrap();
//!     write_to_memory(x.get_mut(native.device()).unwrap(), payload); // Write to native host memory.
//!     // Run the sigmoid operation, provided by the NN Plugin, on your CUDA enabled GPU.
//!     backend.sigmoid(&mut x, &mut result).unwrap();
//!     // See the result.
//!     println!("{:?}", result.get(native.device()).unwrap().as_native().unwrap().as_slice::<f32>());
//! }