I think you really need to be more specific of what is the mapping between your input (in this case node1, node2, node3) and your output (in this case evals), otherwise we are just talking in circle. Do you use chaospy that takes the 20*3 input values and gives you 20 output values? And you want to infer the posterior distribution of the 3 input parameters now given the 20 observed (output values)?
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