Function payload_set_err

ds4.c:23308–23310

     * per-head norm/rope, the attention core and its owned output groups.
     * q and heads hold the owned half compactly at the buffer base; the
     * head range lines up with the output-group split (32 heads = 4 of the
     * 8 groups). */
    uint64_t tp_q_row_bytes = 0;
    if (ok) ok = metal_graph_dense_quant_row_bytes(layer->attn_q_b,
                                                   q_rank,
                                                   &tp_q_row_bytes);