[BugFix]Fix dims mismatch when run rec_svtrnet model in eager mode (#43373)

* change tensor name

* fix unittest bugs

paddle/fluid/eager/api/utils/global_utils.h

@@ -57,7 +57,7 @@ class Controller {
   }
   bool HasGrad() const { return tracer_->HasGrad(); }
   void SetHasGrad(bool has_grad) { tracer_->SetHasGrad(has_grad); }
-  std::string GenerateUniqueName(std::string key = "eager_tmp") {
+  std::string GenerateUniqueName(std::string key = "eager_in_tmp") {
     return tracer_->GenerateUniqueName(key);
   }
   const std::shared_ptr<paddle::imperative::Tracer>& GetCurrentTracer() {

python/paddle/fluid/tests/unittests/test_var_base.py

@@ -1776,7 +1776,7 @@ class TestEagerTensorGradNameValue(unittest.TestCase):
             b = a**2
             self.assertEqual(a._grad_value(), None)
             b.backward()
-            self.assertEqual('eager_tmp' in a._grad_name(), True)
+            self.assertEqual('eager_in_tmp' in a._grad_name(), True)
             self.assertNotEqual(a._grad_value(), None)