oarust 0.8.6

GPU-first semantic computing engine written in Rust
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// Mechanical adaptation of OA's binary-cross-entropy prediction adjoint.

import storage;
import attributes;

struct PushConstants {
	uint prediction_index;
	uint target_index;
	uint prediction_gradient_index;
	uint element_count;
};

[[vk::push_constant]] PushConstants push;
[[vk::binding(0, 0)]] RWByteAddressBuffer storage_buffers[];

[kernel_name("bce_backward")]
[domain("ml")]
[variant("generic")]
[dtype("f32")]
[status("experimental")]
[shader("compute")]
[numthreads(256, 1, 1)]
void main(uint3 dispatch_thread_id : SV_DispatchThreadID) {
	uint index = dispatch_thread_id.x;
	if (index >= push.element_count) {
		return;
	}
	float prediction = clamp(
		load_f32(storage_buffers[push.prediction_index], index),
		1.0e-7f,
		1.0f - 1.0e-7f
	);
	float target = load_f32(storage_buffers[push.target_index], index);
	float gradient = (prediction - target)
		/ (prediction * (1.0f - prediction) * float(push.element_count));
	store_f32(storage_buffers[push.prediction_gradient_index], index, gradient);
}