Question about example/

Hello,when i run the code (difftaichi/example/,the result save as binary rather than a gif or png,How to reproduce the effect of the paper or the result of the github ?
the difftaichi code:GitHub - taichi-dev/difftaichi: 10 differentiable physical simulators built with Taichi differentiable programming (DiffTaichi, ICLR 2020)

My version is 0.6.32