mkl_sparse_s_spmmd is slower than tensorflow tf.sparse_matmul

I have two sparse matrix,both of them sparsity is about 55%, I use mkl_sparse_s_spmmd function and pack the funtion .so dynamic library.in python program import .so.I compare .so and th.sparse_matmul use the same dataset.but I found the tf.sparse_matmul performance is good than the .so.

I compile MKL tensorflow,and test in this tensorflow.