Function gpu_histogram 

pub fn gpu_histogram(
    data: &[f64],
    min_val: f64,
    max_val: f64,
    num_bins: usize,
) -> Vec<usize>

Compute a histogram of the input data over num_bins equal-width bins spanning [min_val, max_val).

Returns a Vecusizeof lengthnum_bins`. Values outside the range are clamped to the first/last bin.