oarust 0.8.6

GPU-first semantic computing engine written in Rust
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// Mechanical Rust adaptation of OA's FP32 Mish adjoint.
// Donor: source/cpp/lib/oa/ml/shader/compute/nn/activation/mishBwd.slang

import activations;
import storage;
import attributes;

struct PushConstants {
	uint input_index;
	uint output_gradient_index;
	uint input_gradient_index;
	uint element_count;
};
[[vk::push_constant]] PushConstants push;
[[vk::binding(0, 0)]] RWByteAddressBuffer storage_buffers[];

[kernel_name("mish_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 input = load_f32(storage_buffers[push.input_index], index);
	float output_gradient = load_f32(storage_buffers[push.output_gradient_index], index);
	float softplus = input > 20.0f ? input : log(1.0f + exp(input));
	float tanh_softplus = tanh(softplus);
	float derivative = tanh_softplus
		+ input * sigmoid(input) * (1.0f - tanh_softplus * tanh_softplus);
	store_f32(storage_buffers[push.input_gradient_index], index,
		output_gradient * derivative);
}