"delete unused comment"

paddle/operators/math/math_function.h

@@ -77,15 +77,6 @@ void matmul(const framework::Tensor& matrix_a, bool trans_a,
             framework::Tensor* matrix_out, T beta,
             platform::DeviceContext* context);
 
-// // matrix multiply with continuous memory
-// template <typename Place, typename T>
-// void matmul(const framework::Tensor& matrix_a, bool trans_a,
-//             const framework::Tensor& matrix_b, bool trans_b,
-//             framework::Tensor* matrix_out,
-//             platform::DeviceContext* context) {
-//   matmul(matrix_a, matrix_b, trans_a, trans_b, 1, matrix_out, 0, context);
-// }
-
 }  // namespace math
 }  // namespace operators
 }  // namespace paddle