#1869 Fix null reference errors when training from scratch with CUDA (#1907)

* #1869 Fix null reference errors when training from scratch with CUDA build

Calling ggml_compute_forward when node->src0 was null was causing train-text-from-scratch.exe to terminate unexpectedly.

* ggml : do not dereference src0 if NULL

---------

Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/ggml.c b/ggml.c
index ef9e858..7104be0 100644
--- a/ggml.c
+++ b/ggml.c
@@ -14911,7 +14911,7 @@ static void ggml_compute_forward(struct ggml_compute_params * params, struct ggm
     if (skip_cpu) {
         return;
     }
-    GGML_ASSERT(tensor->src0->backend == GGML_BACKEND_CPU);
+    GGML_ASSERT(tensor->src0 == NULL || tensor->src0->backend == GGML_BACKEND_CPU);
     GGML_ASSERT(tensor->src1 == NULL || tensor->src1->backend == GGML_BACKEND_CPU);
 #endif // GGML_USE_CUBLAS