!9766 Fix a bug in AllGather fusion when there is only one input

From: @alouhahahahaha
Reviewed-by: @zhoufeng54,@xu-yfei
Signed-off-by: @xu-yfei

mindspore/ccsrc/backend/kernel_compiler/hccl/hccl_kernel.cc

@@ -165,7 +165,7 @@ const std::vector<size_t> &HcclKernel::GetOutputSizeList() const {
     fusion = AnfAlgo::GetNodeAttr<int64_t>(cnode, kAttrFusion);
   }
   ulong loop_size = hccl_data_type_list_.size();
-  if (op_name == kAllGatherOpName && fusion >= 1) {
+  if (AnfAlgo::GetInputTensorNum(anf_node_) > 1 && op_name == kAllGatherOpName && fusion >= 1) {
     loop_size *= rank_size;
   }
   for (ulong i = 0; i < loop_size; ++i) {

mindspore/ccsrc/backend/optimizer/ascend/enhancer/concat_outputs_for_all_gather.cc

@@ -69,7 +69,7 @@ const AnfNodePtr ConcatOutputsForAllGather::Process(const FuncGraphPtr &func_gra
   if (fusion <= 0) {
     return nullptr;
   }
-  if (AnfAlgo::HasNodeAttr("fused", cnode)) {
+  if (AnfAlgo::HasNodeAttr("fused", cnode) || AnfAlgo::GetInputTensorNum(node) == 1) {
     return nullptr;
   }
   AnfAlgo::SetNodeAttr("fused", MakeValue(true), node);