problem with tensor core when using float16

[VivaLaTian]

When I am doing matrix multiplication，I use the blocksparse with tensor core, and I find a problem.
the code is below.

by dong this，I get the answer as below.

I got different answer between blocksparse(1.13.1) with float16 and the tensorflow matmul function.
When I use the same code with blocksparse(1.0.0), which uses cuda core, I get the right answer.
I have tried so many different test with tensor core, and they all get the wrong answer. So I really wonder why?
am I using blocksparse api in the wrong way?