fix emb eltwise layernorm (#24873)

test=develop

paddle/fluid/inference/tensorrt/plugin/emb_eltwise_layernorm_plugin.cu

@@ -90,12 +90,6 @@ nvinfer1::DimsExprs EmbEltwiseLayernormPluginDynamic<T>::getOutputDimensions(
                         "so the index should be zero,"
                         "but it's (%d)",
                         output_index));
-  PADDLE_ENFORCE_EQ(
-      nb_inputs, 3,
-      platform::errors::InvalidArgument(
-          "The Input of the EmbEltwiseLayernorm should be 3, but we found "
-          "it has (%d) inputs",
-          nb_inputs));
   nvinfer1::DimsExprs ret;
   ret.nbDims = 5;
   ret.d[0] = inputs[0].d[0];
@@ -113,13 +107,18 @@ bool EmbEltwiseLayernormPluginDynamic<T>::supportsFormatCombination(
   PADDLE_ENFORCE_NOT_NULL(
       in_out, platform::errors::InvalidArgument(
                   "The input of swish plugin shoule not be nullptr."));
-
+  PADDLE_ENFORCE_EQ(nb_outputs, 1,
+                    platform::errors::InvalidArgument(
+                        "The EmbEltwiseLayerNorm's output should be one"
+                        "but it's (%d) outputs.",
+                        nb_outputs));
   PADDLE_ENFORCE_LT(
       pos, nb_inputs + nb_outputs,
       platform::errors::InvalidArgument("The pos(%d) should be less than the "
                                         "num(%d) of the input and the output.",
                                         pos, nb_inputs + nb_outputs));
-  (in_out && pos < (nb_inputs + nb_outputs));
+
+  int all_nums = nb_inputs + nb_outputs;
 
   const nvinfer1::PluginTensorDesc &desc = in_out[pos];
   if (desc.format != nvinfer1::TensorFormat::kLINEAR) {
@@ -131,18 +130,19 @@ bool EmbEltwiseLayernormPluginDynamic<T>::supportsFormatCombination(
   }
 
   const nvinfer1::PluginTensorDesc &prev = in_out[pos - 1];
-  if (pos == 1 || pos == 2) {
+  if (pos < all_nums - 1) {
     return desc.type == nvinfer1::DataType::kINT32 &&
            desc.dims.d[0] == prev.dims.d[0] && desc.dims.d[1] == prev.dims.d[1];
   }
 
-  if (pos == 3) {
+  if (pos == all_nums - 1) {
     if (sizeof(T) == sizeof(float)) {
       return desc.type == nvinfer1::DataType::kFLOAT;
     } else {
       return desc.type == nvinfer1::DataType::kHALF;
     }
   }
+  return false;
 }
 
 template <typename T>