Fix the bug of setting shape when the axis is negative in the split fission pass

mindspore/ccsrc/pre_activate/ascend/ir_fission/split_fission.cc

@@ -82,6 +82,9 @@ void CreateOutputShapeAndTypeId(const CNodePtr &origin_cnode, int split_dim, int
   MS_EXCEPTION_IF_NULL(new_type_ids);
   MS_EXCEPTION_IF_NULL(new_output_shapes);
   auto output_shape = AnfAlgo::GetOutputInferShape(origin_cnode, 0);
+  if (split_dim < 0) {
+    split_dim += output_shape.size();
+  }
   output_shape[split_dim] = split_size;
   TypeId type_id = AnfAlgo::GetOutputInferDataType(origin_cnode, 0);
   for (int i = 0; i < num_split; ++i) {
@@ -97,6 +100,9 @@ void SetAttrAndAbstractForBaseSplitv(const CNodePtr &origin_cnode, const CNodePt
   std::vector<std::vector<size_t>> base_output_shapes_base;
   auto output_shape = AnfAlgo::GetOutputInferShape(origin_cnode, 0);
   TypeId type_id = AnfAlgo::GetOutputInferDataType(origin_cnode, 0);
+  if (split_dim < 0) {
+    split_dim += output_shape.size();
+  }
   for (int i = 0; i < num_split; ++i) {
     output_shape[split_dim] = size_splits_base[i];
     base_output_shapes_base.emplace_back(output_shape);