patches.rs

  /// A patch is a concept from image processing which captures subregions of the image pixels, 
  /// used to capture groups of spatial features from the underlying image.
  pub fn
  patches (&mut self, image: &Array2<f64>) -> Vec<Patch>
  {
    let mut data: Vec<Patch> = Vec::new();

    for x in 0..(image.shape()[0] - self.rows + 1) {
      for y in 0..(image.shape()[1] - self.cols + 1) {
        let p = Patch {
          x: x,
          y: y,
          data: image.slice(
            // Collect a 2-D slice of the image from 
            // [(x -> x + kernel rows), (y -> y + kernel_cols)]
            s![
              x..(x + self.rows), 
              y..(y + self.cols)
            ])
            .to_owned()
            .insert_axis(Axis(2))
        };

        data.push(p)
      }
    }

    data
  }