Gradient of Parameter `ssd1_batchnorm0_beta` on context gpu(0) has not been updated by backward since last `step`

I am trying to execute this code in the link for … and im new in this frame work …and i have to idea why i’m getting this warning , i’m executing their code as it is , can anyone please help me out …

Hi. I think the issue would be best to resolve in

i already did that … waiting for their reply … it will be real help if soeone can help me here