Struct CosineEmbeddingLossBackward 

pub struct CosineEmbeddingLossBackward {
    pub name: &'static str,
    pub id: String,
    pub block_size: i32,
    pub kernel_source: String,
    pub entry_point_source: String,
    pub source: String,
}

Cosine embedding loss backward (per-row).

Let c = cos_sim, n1 = ||x1||, n2 = ||x2||, r1 = 1/n1, r2 = 1/n2.

dc/dx1[k] = (x2[k]*r2 - c*x1[k]*r1) * r1
dc/dx2[k] = (x1[k]*r1 - c*x2[k]*r2) * r2

coeff = -dy  if y ==  1
      =  dy  if y == -1 and cos_sim > margin
      =   0  otherwise

dx1 = coeff * dc/dx1,   dx2 = coeff * dc/dx2

Grid: [n_rows, 1, 1]. BLOCK_SIZE must equal next_power_of_two(n_dim).

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_size: 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 CosineEmbeddingLossBackward

pub fn new(block_size: i32) -> Self

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

Trait Implementations

impl Kernel for CosineEmbeddingLossBackward

type Args<'__a> = (*mut f32, *mut f32, *mut f32, *mut f32, *mut f32, *mut f32, i32, i32, f32)

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".