Struct ChannelCatBackward 

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

Channel-wise cat backward — extracts the gradient slice for one input from the combined upstream gradient tensor.

Index mapping: dx[n * chunk_c + ci] = dy[n * c_total + chunk_offset + ci]

No atomic operations are required: this kernel reads from a specific disjoint channel range of dy and writes to its own output buffer.

Grid: same as channel_cat_forward.

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<D: Num> ChannelCatBackward<D>

pub fn new(block_size: i32) -> Self

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

Trait Implementations

impl<D: Num> Kernel for ChannelCatBackward<D>

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