oarust 0.8.6

GPU-first semantic computing engine written in Rust
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// U32 Embedding gather. One invocation writes one output scalar.

import storage;
import attributes;

struct PushConstants {
	uint weight_index;
	uint indices_index;
	uint output_index;
	uint index_count;
	uint num_embeddings;
	uint embedding_dim;
};

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

[kernel_name("embedding")]
[domain("ml")]
[variant("generic")]
[dtype("f32")]
[status("experimental")]
[shader("compute")]
[numthreads(256, 1, 1)]
void main(uint3 dispatch_thread_id : SV_DispatchThreadID) {
	uint output_index = dispatch_thread_id.x;
	uint output_count = push.index_count * push.embedding_dim;
	if (output_index >= output_count) {
		return;
	}

	uint index_position = output_index / push.embedding_dim;
	uint feature = output_index % push.embedding_dim;
	uint row = storage_buffers[push.indices_index].Load(index_position * 4u);
	float value = row < push.num_embeddings
		? load_f32(storage_buffers[push.weight_index], row * push.embedding_dim + feature)
		: asfloat(0x7fc00000u);
	store_f32(storage_buffers[push.output_index], output_index, value);
}