!6978 [MSLITE] transformat optimize for leaky_relu

Merge pull request !6978 from zhengjun10/master

mindspore/lite/tools/converter/legacy_optimizer/graph/trans_format_insert_pass.cc

@@ -88,6 +88,11 @@ bool TransOpInsertPass::CanFusion(schema::MetaGraphT *graph, const std::unique_p
   }
   auto total_node_count = input_node_indexes.size() + output_node_indexes.size();
   size_t half_count = total_node_count / 2;
+  if (GetCNodeTType(*node) == schema::PrimitiveType_Activation) {
+    if (node->primitive->value.AsActivation()->type == schema::ActivationType_LEAKY_RELU) {
+      return has_trans_count >= half_count;
+    }
+  }
   if (total_node_count % 2 == 0) {
     can_fusion = has_trans_count > half_count;
   } else {