add trt error information. (#35277)

* add trt error information.

* rerun ci

paddle/fluid/operators/tensorrt/tensorrt_engine_op.h

@@ -266,7 +266,7 @@ class TensorRTEngineOp : public framework::OperatorBase {
 
   void RunTrt(const framework::Scope &scope, const platform::Place &dev_place,
               TensorRTEngine *engine) const {
-    int runtime_batch = 1;
+    int runtime_batch = -1;
     platform::DeviceContextPool &pool = platform::DeviceContextPool::Instance();
     auto &dev_ctx = *pool.Get(dev_place);
     auto stream =
@@ -297,7 +297,6 @@ class TensorRTEngineOp : public framework::OperatorBase {
       auto &t =
           inference::analysis::GetFromScope<framework::LoDTensor>(scope, x);
       auto t_shape = framework::vectorize<int64_t>(t.dims());
-      runtime_batch = t_shape[0];
       const int bind_index = engine->engine()->getBindingIndex(x.c_str());
       PADDLE_ENFORCE_LT(
           bind_index, num_bindings,
@@ -317,6 +316,28 @@ class TensorRTEngineOp : public framework::OperatorBase {
           std::vector<int64_t> runtime_input_shape(t_shape.begin() + 1,
                                                    t_shape.end());
           RuntimeStaticShapeCheck(runtime_input_shape, model_input_shape);
+          if (runtime_batch != -1) {
+            PADDLE_ENFORCE_EQ(
+                runtime_batch, t_shape[0],
+                platform::errors::InvalidArgument(
+                    "Inputs of trt subgraphs has different batchsize. "
+                    "It's not allowed in static shape mode. "
+                    "Check whether the model you are running has multiple trt "
+                    "subgraphs: \n "
+                    "\tIf there are multiple trt subgraphs, you need to ensure "
+                    "that the first dimension of the input tensor of these "
+                    "subgraphs is "
+                    "consistent.\n"
+                    "\tIf there are inconsistent subgraphs, you need to filter "
+                    "them "
+                    "by "
+                    "setting min_subgraph_size using EnableTensorrtEngine "
+                    "interface.\n"
+                    "\tThe min_subgraph_size shouble to be greater than the "
+                    "number "
+                    "of "
+                    "nodes in the inconsistent subgraph.\n"));
+          }
         }
       } else {
 #if IS_TRT_VERSION_GE(6000)
@@ -341,6 +362,7 @@ class TensorRTEngineOp : public framework::OperatorBase {
             bind_index, inference::tensorrt::Vec2TRT_Dims(t_shape, x, true));
 #endif
       }
+      runtime_batch = t_shape[0];
       auto type = t.type();
       if (type == framework::proto::VarType::FP32) {
         buffers[bind_index] = static_cast<void *>(t.data<float>());