sampler doesn't work

[YujinK-CHN]

Thank you for your work! However, while I was trying to run your evaluation code, I came across with an issue when compiling the sampler files and here is the error information. ImportError: Building module learnable_primitives.fast_sampler._sampler failed: ['ImportError: /home/isaac/.pyxbld/lib.linux-x86_64-2.7/learnable_primitives/fast_sampler/_sampler.so: undefined symbol: sample_on_batch\n']

Can anyone help me resolve this problem? Thank you!