WIP: Flash Attention implementation (forward + backward)

examples/batched-bench/batched-bench.cpp

@@ -104,7 +104,7 @@ int main(int argc, char ** argv) {
 
     ctx_params.seed      = 1234;
     ctx_params.n_ctx     = n_kv_max;
-    ctx_params.n_batch   = 512;
+    ctx_params.n_batch   = 2048;
     ctx_params.mul_mat_q = mmq;
 
     ctx_params.n_threads       = params.n_threads;