diff --git a/paddle/fluid/operators/math/matrix_bit_code.cc b/paddle/fluid/operators/math/matrix_bit_code.cc
index 8baffe1ba1e5f7d660ec8187a467ab585af46be6..2967586949846149e07d5f48bf156bda151fda8c 100644
--- a/paddle/fluid/operators/math/matrix_bit_code.cc
+++ b/paddle/fluid/operators/math/matrix_bit_code.cc
@@ -102,6 +102,8 @@ void MatrixBitCodeFunctor<T>::MulGradWeight(const framework::LoDTensor& tmat,
   size_t input_width = input.dims()[1];
   size_t tmat_width = tmat.dims()[1];
   size_t weight_width = weight->dims()[1];
+  VLOG(30) << "sparse w_grad dims is [" << weight->dims()[0] << " ,"
+           << weight->dims()[1] << " ]";
   auto tmat_value = tmat.data<T>();
   auto weight_value = weight->data<T>();
   auto input_value = input.data<T>();
@@ -127,6 +129,8 @@ void MatrixBitCodeFunctor<T>::MulGradWeight(const framework::LoDTensor& tmat,
   size_t input_width = input.dims()[1];
   size_t tmat_width = tmat.dims()[1];
   size_t weight_width = weight->value().dims()[1];
+  VLOG(30) << "sparse w_grad dims is: [" << weight->value().dims()[0] << " ,"
+           << weight->value().dims()[1] << " ]";
   auto tmat_value = tmat.data<T>();
   auto weight_value = weight->mutable_value()->data<T>();
   auto input_value = input.data<T>();