add tensor numel check for float (#50415)

paddle/fluid/pybind/op_function_common.cc

@@ -92,7 +92,8 @@ bool PyObject_CheckFloatOrToFloat(PyObject** obj) {
   // sometimes users provide PyLong or numpy.int64 but attr is float
   if (PyFloat_Check(*obj) || PyLong_Check(*obj) ||
       PyObject_IsInstance(*obj, (PyObject*)g_varbase_pytype) ||  // NOLINT
-      PyObject_IsInstance(*obj, (PyObject*)p_tensor_type)) {     // NOLINT
+      (PyObject_IsInstance(*obj, (PyObject*)p_tensor_type) &&    // NOLINT
+       (((TensorObject*)(*obj))->tensor.numel() == 1))) {        // NOLINT
     return true;
   }
   if (std::string(((PyTypeObject*)(*obj)->ob_type)->tp_name)  // NOLINT