for metric in execution_stats: do not contain the metrics

[esmeraldaderubi]

you want to make the mean and std of client_id and other unrelated variables in compile_results 149 line (client_id, running time)
and then ean = np.average(per_client_metrics[metric]) error. it does not make sense

[esmeraldaderubi]

do this
#for metric in execution_stats:
for metric in per_client_metrics:
mean = np.average(per_client_metrics[metric])