revert pr https://github.com/PaddlePaddle/Paddle/pull/46779 (#53373)

paddle/fluid/inference/tensorrt/op_teller.cc

@@ -542,16 +542,6 @@ struct SimpleOpTypeSetTeller : public Teller {
                      "the pass.";
           return false;
         }
-
-        auto index_var_name = desc.Input("Index")[0];
-        auto* index_var_desc = block->FindVar(index_var_name);
-
-        // The index input must be int32 datatype.
-        if (index_var_desc->GetDataType() !=
-            paddle::framework::proto::VarType_Type::VarType_Type_INT32) {
-          VLOG(3) << "gather op Index input data type must be int32";
-          return false;
-        }
 #if !IS_TRT_VERSION_GE(7000)
         auto* x_var_desc = block->FindVar(desc.Input("X")[0]);
         const auto x_shape = x_var_desc->GetShape();

test/ir/inference/test_trt_convert_gather.py

@@ -182,7 +182,7 @@ class TrtConvertGatherTest(TrtLayerAutoScanTest):
             if self.input_num == 3:
                 return 0, 5
             else:
-                if dynamic_shape and self.index_type_int32:
+                if dynamic_shape:
                     return 1, 3
                 else:
                     return 0, 4