Struct YoloCiouLossBackward 

pub struct YoloCiouLossBackward<D: Float> {
    pub name: &'static str,
    pub id: String,
    pub block_n: i32,
    pub kernel_source: String,
    pub entry_point_source: String,
    pub source: String,
    /* private fields */
}

Fused CIoU loss backward: computes ∂L/∂pred given the upstream gradient and the saved activations from the forward pass.

Only produces gradients w.r.t. pred; target boxes are treated as constants.

Gradient decomposes into three independent parts:

(a) IoU term: ∂(−IoU)/∂pred (b) Center-distance term: ∂(d²/(c²+ε))/∂pred (c) α·v term: ∂(α·v)/∂(pw,ph) — zero for (px,py)

The min/max branching for intersection and enclosing-box corners is re-derived from (pred, target) rather than saved, since pred+target fully determine which branch was active.

Grid: cdiv(N, BLOCK_N) — one CTA per anchor tile.

Fields

name: &'static str

The kernel function’s name (e.g. "flash_attention2_forward").

id: String

Unique kernel identifier: fn_name + dtype(s) + const values joined by “__”.

block_n: i32

Compile-time kernel constant, from the annotated fn’s const generics.

kernel_source: String

The original kernel function source.

entry_point_source: String

The Rust source of the generated C-ABI entry-point wrapper function.

source: String

Combined source (kernel_source + "\n\n" + entry_point_source); used by the Kernel trait.

Implementations

impl<D: Float> YoloCiouLossBackward<D>

pub fn new(block_n: i32) -> Self

Constructs a new kernel instance for these compile-time parameters.

Trait Implementations

impl<D: Float> Kernel for YoloCiouLossBackward<D>

type Args<'__a> = (*mut D, *mut D, *mut D, *mut D, *mut D, *mut D, *mut D, i32)

This kernel’s launch-argument tuple type.

fn id(&self) -> String

A content hash of this kernel’s source, used as a cache key.

fn name(&self) -> &str

This kernel’s name.

fn source(&self) -> &str

This kernel’s full source (DSL + kernel body + entry point wrapper).

fn kernel_source(&self) -> &str

This kernel’s body source, without the entry-point wrapper.

fn entry_point_source(&self) -> &str

Returns the Rust source of the generated C-ABI entry-point wrapper function.

fn entry_point_name(&self) -> String

Returns the PTX symbol name for this kernel: "{name}_entry_point".