How to get Ground Truth?

I have generated lots of source data like this
2L4ONSKFD9M%SAU58)~KA2K
Each batch has gen_tr, gen_val, gen_te.
gen_tr represents the training set,gen_val represents the validation set, gen_te represents the test set.900102441 represent 900 samples,each sample has 1024 sources with 41 time points.
My question is how to use these source data to get Ground Truth?

My question is how to use these source data to get Ground Truth?

I'm not sure I understand your question.
The ground truth is defined by the parameters you used to simulate all this data.
If this is recorded data, then there is no known ground truth.