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llama-graph : fix text position for mrope #13159

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Merged
merged 3 commits into from
Apr 29, 2025
Merged

llama-graph : fix text position for mrope #13159

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418a31f
llama-graph : fix text position for mrope
ngxson Apr 28, 2025
492345d
fix typo
ngxson Apr 28, 2025
bea76aa
explicitly set 4th dim in the loop
ngxson Apr 28, 2025
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11 changes: 7 additions & 4 deletions src/llama-graph.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -55,13 +55,16 @@ void llm_graph_input_pos::set_input(const llama_ubatch * ubatch) {
if (ubatch->pos && pos) {
const int64_t n_tokens = ubatch->n_tokens;

if (ubatch->token && n_pos_per_embd > 1) {
if (ubatch->token && n_pos_per_embd == 4) {
// in case we're using M-RoPE with text tokens, convert the 1D positions to 4D
// the other dimensions are all 0, they are unused for text tokens
std::vector<llama_pos> pos_data(n_tokens*n_pos_per_embd, 0);
// the 3 first dims are the same, and 4th dim is all 0
std::vector<llama_pos> pos_data(n_tokens*n_pos_per_embd);
// copy the first dimension
for (int i = 0; i < n_tokens; ++i) {
pos_data[i] = ubatch->pos[i];
pos_data[ i] = ubatch->pos[i];
pos_data[ n_tokens + i] = ubatch->pos[i];
pos_data[2 * n_tokens + i] = ubatch->pos[i];
pos_data[3 * n_tokens + i] = 0; // 4th dim is 0
}
ggml_backend_tensor_set(pos, pos_data.data(), 0, pos_data.size()*ggml_element_size(pos));
} else {
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