problem with generating posterior preditions

[dokato]

I had trouble running hddm.utils.post_pred_gen on my data.

I got:

    942 
    943         if len(data_nodes) != 1:
--> 944             raise NotImplementedError("Supply a grouping so that at most 1 observed node codes for each group.")
    945 
    946         return data_nodes[0]

NotImplementedError: Supply a grouping so that at most 1 observed node codes for each group.

The intermediate solution is to reset indices of the input data if you filter out some trials.

data.reset_index(inplace = True, drop = True)